diff --git a/unmaintained/4DNav/4DNav-docs.factor b/unmaintained/4DNav/4DNav-docs.factor
deleted file mode 100755
index 95f231ecb9..0000000000
--- a/unmaintained/4DNav/4DNav-docs.factor
+++ /dev/null
@@ -1,201 +0,0 @@
-! Copyright (C) 2008 Jean-François Bigot.
-! See http://factorcode.org/license.txt for BSD license.
-USING: help.markup help.syntax kernel quotations strings ;
-IN: 4DNav
-
-
-HELP: menu-3D
-{ $values
-     { "gadget" "gadget" }
-}
-{ $description "The menu dedicated to 3D movements of the camera" } ;
-
-HELP: menu-4D
-{ $values
-    
-     { "gadget" "gadget" }
-}
-{ $description "The menu dedicated to 4D movements of space" } ;
-
-HELP: menu-bar
-{ $values
-    
-     { "gadget" "gadget" }
-}
-{ $description "return gadget containing menu buttons" } ;
-
-HELP: model-projection
-{ $values
-     { "x" "interger" }
-     { "space" "space" }
-}
-{ $description "Project space following coordinate x" } ;
-
-HELP: mvt-3D-1
-{ $values
-    
-     { "quot" "quotation" }
-}
-{ $description "return a quotation to orientate space to see it from first point of view" } ;
-
-HELP: mvt-3D-2
-{ $values
-    
-     { "quot" "quotation" }
-}
-{ $description "return a quotation to orientate space to see it from second point of view" } ;
-
-HELP: mvt-3D-3
-{ $values
-    
-     { "quot" "quotation" }
-}
-{ $description "return a quotation to orientate space to see it from third point of view" } ;
-
-HELP: mvt-3D-4
-{ $values
-    
-     { "quot" "quotation" }
-}
-{ $description "return a quotation to orientate space to see it from first point of view" } ;
-
-HELP: load-model-file
-{ $description "load space from file" } ;
-
-HELP: rotation-4D
-{ $values
-     { "m" "a rotation matrix" }
-}
-{ $description "Apply a 4D rotation matrix" } ;
-
-HELP: translation-4D
-{ $values
-     { "v" "vector" }
-}
-{ $description "Apply a 4D translation" } ;
-
-
-ARTICLE: "implementation details" "How 4DNav is done"
-"4DNav is build using :"
-
-{ $subsection "4DNav.camera" }
-{ $subsection "adsoda-main-page" }
-;
-
-ARTICLE: "Space file" "Create a new space file"
-"To build a new space, create an XML file using " { $vocab-link "adsoda" } " model description. A solid is not caracterized by its corners but is defined as the intersection of hyperplanes."
-
-$nl
-"An example is:"
-$nl
-
-"\n<model>"
-"\n<space>"
-"\n <dimension>4</dimension>"
-"\n <solid>"
-"\n     <name>4cube1</name>"
-"\n     <dimension>4</dimension>"
-"\n     <face>1,0,0,0,100</face>"
-"\n     <face>-1,0,0,0,-150</face>"
-"\n     <face>0,1,0,0,100</face>"
-"\n     <face>0,-1,0,0,-150</face>"
-"\n     <face>0,0,1,0,100</face>"
-"\n     <face>0,0,-1,0,-150</face>"
-"\n     <face>0,0,0,1,100</face>"
-"\n     <face>0,0,0,-1,-150</face>"
-"\n     <color>1,0,0</color>"
-"\n </solid>"
-"\n <solid>"
-"\n     <name>4triancube</name>"
-"\n     <dimension>4</dimension>"
-"\n     <face>1,0,0,0,160</face>"
-"\n     <face>-0.4999999999999998,-0.8660254037844387,0,0,-130</face>"
-"\n     <face>-0.5000000000000004,0.8660254037844384,0,0,-130</face>"
-"\n     <face>0,0,1,0,140</face>"
-"\n     <face>0,0,-1,0,-180</face>"
-"\n     <face>0,0,0,1,110</face>"
-"\n     <face>0,0,0,-1,-180</face>"
-"\n     <color>0,1,0</color>"
-"\n </solid>"
-"\n <solid>"
-"\n     <name>triangone</name>"
-"\n     <dimension>4</dimension>"
-"\n     <face>1,0,0,0,60</face>"
-"\n     <face>0.5,0.8660254037844386,0,0,60</face>"
-"\n     <face>-0.5,0.8660254037844387,0,0,-20</face>"
-"\n     <face>-1.0,0,0,0,-100</face>"
-"\n     <face>-0.5,-0.8660254037844384,0,0,-100</face>"
-"\n     <face>0.5,-0.8660254037844387,0,0,-20</face>"
-"\n     <face>0,0,1,0,120</face>"
-"\n     <face>0,0,-0.4999999999999998,-0.8660254037844387,-120</face>"
-"\n     <face>0,0,-0.5000000000000004,0.8660254037844384,-120</face>"
-"\n     <color>0,1,1</color>"
-"\n </solid>"
-"\n <light>"
-"\n     <direction>1,1,1,1</direction>"
-"\n     <color>0.2,0.2,0.6</color>"
-"\n </light>"
-"\n <color>0.8,0.9,0.9</color>"
-"\n</space>"
-"\n</model>"
-
-
-;
-ARTICLE: "TODO" "Todo"
-{ $list 
-    "A vocab to initialize parameters"
-    "an editor mode" 
-        { $list "add a face to a solid"
-                "add a solid to the space"
-                "move a face"
-                "move a solid"
-                "select a solid in a list"
-                "select a face"
-                "display selected face"
-                "edit a solid color"
-                "add a light"
-                "edit a light color"
-                "move a light"
-                }
-    "add a tool wich give an hyperplane normal vector with enought points. Will use adsoda.intersect-hyperplanes with { { 0 } { 0 } { 1 } } "
-    "decorrelate 3D camera and activate them with select buttons"
-
-} ;
-
-
-ARTICLE: "4DNav" "The 4DNav app"
-{ $vocab-link "4DNav" }
-$nl
-{ $heading "4D Navigator" }
-"4DNav is a simple tool to visualize 4 dimensionnal objects."
-"\n"
-"It uses " { $vocab-link "adsoda" } " library to display a 4D space and navigate thru it."
-$nl
-"It will display:"
-{ $list
-    { "a menu window" }
-    {  "4 visualization windows" }
-}
-"Each visualization window represents the projection of the 4D space on a particular 3D space."
-
-{ $heading "Start" }
-"type:" { $code "\"4DNav\" run" } 
-
-{ $heading "Navigation" }
-"Menu window is divided in 4 areas"
-{ $list
-    { "a space-file chooser to select the file to display" }
-    { "a parametrization area to select the projection mode" }
-    { "4D submenu to translate and rotate the 4D space" }
-    { "3D submenu to move the camera in 3D space. Cameras in every 3D spaces are manipulated as a single one" }
-    }
-
-{ $heading "Links" }
-{ $subsection "Space file" }
-
-{ $subsection "TODO" }
-{ $subsection "implementation details" }
-
-;
-
-ABOUT: "4DNav"
diff --git a/unmaintained/4DNav/4DNav.factor b/unmaintained/4DNav/4DNav.factor
deleted file mode 100755
index 91c1c94b35..0000000000
--- a/unmaintained/4DNav/4DNav.factor
+++ /dev/null
@@ -1,556 +0,0 @@
-! Copyright (C) 2008 Jeff Bigot
-! See http://factorcode.org/license.txt for BSD license.
-USING: kernel 
-namespaces
-accessors
-make
-math
-math.functions
-math.trig
-math.parser
-hashtables
-sequences
-combinators
-continuations
-colors
-prettyprint
-vars
-quotations
-io
-io.directories
-io.pathnames
-help.markup
-io.files
-ui.gadgets.panes
- ui
-       ui.gadgets
-       ui.traverse
-       ui.gadgets.borders
-       ui.gadgets.handler
-       ui.gadgets.slate
-       ui.gadgets.theme
-       ui.gadgets.frames
-       ui.gadgets.tracks
-       ui.gadgets.labels
-       ui.gadgets.labelled       
-       ui.gadgets.lists
-       ui.gadgets.buttons
-       ui.gadgets.packs
-       ui.gadgets.grids
-       ui.gestures
-       ui.tools.workspace
-       ui.gadgets.scrollers
-splitting
-vectors
-math.vectors
-rewrite-closures
-self
-values
-4DNav.turtle
-4DNav.window3D
-4DNav.deep
-4DNav.space-file-decoder
-models
-fry
-adsoda
-adsoda.tools
-;
-
-IN: 4DNav
-VALUE: selected-file
-VALUE: translation-step
-VALUE: rotation-step
-
-3 to: translation-step 
-5 to: rotation-step
-
-VAR: selected-file-model
-VAR: observer3d 
-VAR: view1 
-VAR: view2
-VAR: view3
-VAR: view4
-VAR: present-space
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-! replacement of namespaces.lib
-    
-: make* ( seq -- seq ) [ dup quotation? [ call ] [ ] if ] map ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-! waiting for deep-cleave-quots
-
-: 4D-Rxy ( angle -- Rx ) deg>rad
-[ 1.0 , 0.0 , 0.0       , 0.0 ,
-  0.0 , 1.0 , 0.0       , 0.0 ,
-  0.0 , 0.0 , dup cos  , dup sin neg  ,
-  0.0 , 0.0 , dup sin  , dup cos  ,  ] 4 make-matrix nip ;
-
-: 4D-Rxz ( angle -- Ry ) deg>rad
-[ 1.0 , 0.0       , 0.0 , 0.0 ,
-  0.0 , dup cos  , 0.0 , dup sin neg  ,
-  0.0 , 0.0       , 1.0 , 0.0 ,
-  0.0 , dup sin  , 0.0 , dup cos  ,  ] 4 make-matrix nip ;
-
-: 4D-Rxw ( angle -- Rz ) deg>rad
-[ 1.0 , 0.0       , 0.0           , 0.0 ,
-  0.0 , dup cos  , dup sin neg  , 0.0 ,
-  0.0 , dup sin  , dup cos     , 0.0 ,
-  0.0 , 0.0       , 0.0           , 1.0 , ] 4 make-matrix nip ;
-
-: 4D-Ryz ( angle -- Rx ) deg>rad
-[ dup cos  , 0.0 , 0.0 , dup sin neg  ,
-  0.0       , 1.0 , 0.0 , 0.0 ,
-  0.0       , 0.0 , 1.0 , 0.0 ,
-  dup sin  , 0.0 , 0.0 , dup cos  ,   ] 4 make-matrix nip ;
-
-: 4D-Ryw ( angle -- Ry ) deg>rad
-[ dup cos  , 0.0 , dup sin neg  , 0.0 ,
-  0.0       , 1.0 , 0.0           , 0.0 ,
-  dup sin  , 0.0 , dup cos     , 0.0 ,
-  0.0       , 0.0 , 0.0        , 1.0 ,  ] 4 make-matrix nip ;
-
-: 4D-Rzw ( angle -- Rz ) deg>rad
-[ dup cos  , dup sin neg  , 0.0 , 0.0 ,
-  dup sin  , dup cos     , 0.0 , 0.0 ,
-  0.0       , 0.0           , 1.0 , 0.0 ,
-  0.0       , 0.0          , 0.0 , 1.0 ,  ] 4 make-matrix nip ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-! UI
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: button* ( string quot -- button ) 
-    closed-quot <repeat-button>  ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-! 
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: model-projection-chooser ( -- gadget )
-   observer3d> projection-mode>>
-   { { 1 "perspective" } { 0 "orthogonal" } } 
-   <toggle-buttons> ;
-
-: collision-detection-chooser ( -- gadget )
-   observer3d> collision-mode>>
-   { { t "on" } { f "off" }  } <toggle-buttons> ;
-
-: model-projection ( x -- space ) 
-    present-space>  swap space-project ;
-
-: update-observer-projections (  -- )
-    view1> relayout-1 
-    view2> relayout-1 
-    view3> relayout-1 
-    view4> relayout-1 ;
-
-: update-model-projections (  -- )
-    0 model-projection <model> view1> (>>model)
-    1 model-projection <model> view2> (>>model)
-    2 model-projection <model> view3> (>>model)
-    3 model-projection <model> view4> (>>model) ;
-
-: camera-action ( quot -- quot ) 
-    [ drop [ ] observer3d>  
-    with-self update-observer-projections ] 
-    make* closed-quot ;
-
-: win3D ( text gadget -- ) 
-    "navigateur 4D : " rot append open-window ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-! 4D object manipulation
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: (mvt-4D) ( quot -- )   
-    present-space>  
-        swap call space-ensure-solids 
-    >present-space 
-    update-model-projections 
-    update-observer-projections ;
-
-: rotation-4D ( m -- ) 
-    '[ _ [ [ middle-of-space dup vneg ] keep 
-        swap space-translate ] dip
-         space-transform 
-         swap space-translate
-    ] (mvt-4D) ;
-
-: translation-4D ( v -- ) '[ _ space-translate ] (mvt-4D) ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-! menu
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: menu-rotations-4D ( -- gadget )
-    <frame>
-         <pile> 1 >>fill
-          "XY +" [ drop rotation-step 4D-Rxy rotation-4D ] 
-                button* add-gadget
-          "XY -" [ drop rotation-step neg 4D-Rxy rotation-4D ] 
-                button* add-gadget 
-       @top-left grid-add    
-        <pile> 1 >>fill
-          "XZ +" [ drop rotation-step 4D-Rxz rotation-4D ] 
-                button* add-gadget
-          "XZ -" [ drop rotation-step neg 4D-Rxz rotation-4D ] 
-                button* add-gadget 
-       @top grid-add    
-        <pile> 1 >>fill
-          "YZ +" [ drop rotation-step 4D-Ryz rotation-4D ] 
-                button* add-gadget
-          "YZ -" [ drop rotation-step neg 4D-Ryz rotation-4D ] 
-                button* add-gadget 
-        @center grid-add
-         <pile> 1 >>fill
-          "XW +" [ drop rotation-step 4D-Rxw rotation-4D ] 
-                button* add-gadget
-          "XW -" [ drop rotation-step neg 4D-Rxw rotation-4D ] 
-                button* add-gadget 
-        @top-right grid-add   
-         <pile> 1 >>fill
-          "YW +" [ drop rotation-step 4D-Ryw rotation-4D ] 
-                button* add-gadget
-          "YW -" [ drop rotation-step neg 4D-Ryw rotation-4D ] 
-                button* add-gadget 
-       @right grid-add    
-         <pile> 1 >>fill
-          "ZW +" [ drop rotation-step 4D-Rzw rotation-4D ] 
-                button* add-gadget
-          "ZW -" [ drop rotation-step neg 4D-Rzw rotation-4D ] 
-                button* add-gadget 
-       @bottom-right grid-add    
-;
-
-: menu-translations-4D ( -- gadget )
-    <frame> 
-        <pile> 1 >>fill
-            <shelf> 1 >>fill  
-                "X+" [ drop {  1 0 0 0 } translation-step v*n 
-                    translation-4D ] 
-                    button* add-gadget
-                "X-" [ drop { -1 0 0 0 } translation-step v*n 
-                    translation-4D ] 
-                    button* add-gadget 
-            add-gadget
-            "YZW" <label> add-gadget
-         @bottom-right grid-add
-         <pile> 1 >>fill
-            "XZW" <label> add-gadget
-            <shelf> 1 >>fill
-                "Y+" [ drop  { 0  1 0 0 } translation-step v*n 
-                    translation-4D ] 
-                    button* add-gadget
-                "Y-" [ drop  { 0 -1 0 0 } translation-step v*n 
-                    translation-4D ] 
-                    button* add-gadget 
-                add-gadget
-         @top-right grid-add
-         <pile> 1 >>fill
-            "XYW" <label> add-gadget
-            <shelf> 1 >>fill
-                "Z+" [ drop { 0 0  1 0 } translation-step v*n 
-                    translation-4D ] 
-                    button* add-gadget
-                "Z-" [ drop { 0 0 -1 0 } translation-step v*n 
-                    translation-4D ] 
-                    button* add-gadget 
-                add-gadget                 
-        @top-left grid-add     
-        <pile> 1 >>fill
-            <shelf> 1 >>fill
-                "W+" [ drop { 0 0 0 1  } translation-step v*n 
-                    translation-4D ] 
-                    button* add-gadget
-                "W-" [ drop { 0 0 0 -1 } translation-step v*n 
-                    translation-4D ] 
-                    button* add-gadget 
-                add-gadget
-            "XYZ" <label> add-gadget
-        @bottom-left grid-add 
-        "X" <label> @center grid-add
-;
-
-: menu-4D ( -- gadget )  
-    <shelf> 
-        "rotations" <label>     add-gadget
-        menu-rotations-4D       add-gadget
-        "translations" <label>  add-gadget
-        menu-translations-4D    add-gadget
-        0.5 >>align
-        { 0 10 } >>gap
-;
-
-
-! ------------------------------------------------------
-
-: redraw-model ( space -- )
-    >present-space 
-    update-model-projections 
-    update-observer-projections ;
-
-: load-model-file ( -- )
-  selected-file dup selected-file-model> set-model 
-  read-model-file 
-  redraw-model ;
-
-: mvt-3D-X ( turn pitch -- quot )
-    '[ turtle-pos> norm neg reset-turtle 
-        _ turn-left 
-        _ pitch-up 
-        step-turtle ] ;
-
-: mvt-3D-1 ( -- quot )      90  0 mvt-3D-X ; inline
-: mvt-3D-2 ( -- quot )      0  90 mvt-3D-X ; inline
-: mvt-3D-3 ( -- quot )      0   0 mvt-3D-X ; inline
-: mvt-3D-4 ( -- quot )      45 45 mvt-3D-X ; inline
-
-: camera-button ( string quot -- button ) 
-    [ <label>  ] dip camera-action <repeat-button> ;
-
-! ----------------------------------------------------------
-! file chooser
-! ----------------------------------------------------------
-: <run-file-button> ( file-name -- button )
-  dup '[ drop  _  \ selected-file set-value load-model-file 
-   ] 
- closed-quot  <roll-button> { 0 0 } >>align ;
-
-: <list-runner> ( -- gadget )
-    "resource:extra/4DNav" 
-  <pile> 1 >>fill 
-    over dup directory-files  
-    [ ".xml" tail? ] filter 
-    [ append-path ] with map
-    [ <run-file-button> add-gadget ] each
-    swap <labelled-gadget> ;
-
-! -----------------------------------------------------
-
-: menu-rotations-3D ( -- gadget )
-    <frame>
-        "Turn\n left"  [ rotation-step  turn-left  ] 
-            camera-button   @left grid-add     
-        "Turn\n right" [ rotation-step turn-right ] 
-            camera-button   @right grid-add     
-        "Pitch down"   [ rotation-step  pitch-down ] 
-            camera-button   @bottom grid-add     
-        "Pitch up"     [ rotation-step  pitch-up   ] 
-            camera-button   @top grid-add     
-        <shelf>  1 >>fill
-            "Roll left\n (ctl)"  [ rotation-step  roll-left  ] 
-                camera-button   add-gadget  
-            "Roll right\n(ctl)"  [ rotation-step  roll-right ] 
-                camera-button   add-gadget  
-        @center grid-add 
-;
-
-: menu-translations-3D ( -- gadget )
-    <frame>
-        "left\n(alt)"        [ translation-step  strafe-left  ]
-            camera-button @left grid-add  
-        "right\n(alt)"       [ translation-step  strafe-right ]
-            camera-button @right grid-add     
-        "Strafe up \n (alt)" [ translation-step strafe-up    ] 
-            camera-button @top grid-add
-        "Strafe down\n (alt)" [ translation-step strafe-down  ]
-            camera-button @bottom grid-add    
-        <pile>  1 >>fill
-            "Forward (ctl)"  [  translation-step step-turtle ] 
-                camera-button add-gadget
-            "Backward (ctl)" 
-                [ translation-step neg step-turtle ] 
-                camera-button   add-gadget
-        @center grid-add
-;
-
-: menu-quick-views ( -- gadget )
-    <shelf>
-        "View 1 (1)" mvt-3D-1 camera-button   add-gadget
-        "View 2 (2)" mvt-3D-2 camera-button   add-gadget
-        "View 3 (3)" mvt-3D-3 camera-button   add-gadget 
-        "View 4 (4)" mvt-3D-4 camera-button   add-gadget 
-;
-
-: menu-3D ( -- gadget ) 
-    <pile>
-        <shelf>   
-            menu-rotations-3D    add-gadget
-            menu-translations-3D add-gadget
-            0.5 >>align
-            { 0 10 } >>gap
-        add-gadget
-        menu-quick-views add-gadget ; 
-
-: add-keyboard-delegate ( obj -- obj )
- <handler>
-{
-        { T{ key-down f f "LEFT" }  
-            [ [ rotation-step turn-left ] camera-action ] }
-        { T{ key-down f f "RIGHT" } 
-            [ [ rotation-step turn-right ] camera-action ] }
-        { T{ key-down f f "UP" }    
-            [ [ rotation-step pitch-down ] camera-action ] }
-        { T{ key-down f f "DOWN" }  
-            [ [ rotation-step pitch-up ] camera-action ] }
-
-        { T{ key-down f { C+ } "UP" } 
-           [ [ translation-step step-turtle ] camera-action ] }
-        { T{ key-down f { C+ } "DOWN" } 
-            [ [ translation-step neg step-turtle ] 
-                    camera-action ] }
-        { T{ key-down f { C+ } "LEFT" } 
-            [ [ rotation-step roll-left ] camera-action ] }
-        { T{ key-down f { C+ } "RIGHT" } 
-            [ [ rotation-step roll-right ] camera-action ] }
-
-        { T{ key-down f { A+ } "LEFT" }  
-           [ [ translation-step strafe-left ] camera-action ] }
-        { T{ key-down f { A+ } "RIGHT" } 
-          [ [ translation-step strafe-right ] camera-action ] }
-        { T{ key-down f { A+ } "UP" }    
-            [ [ translation-step strafe-up ] camera-action ] }
-        { T{ key-down f { A+ } "DOWN" }  
-           [ [ translation-step strafe-down ] camera-action ] }
-
-
-        { T{ key-down f f "1" } [ mvt-3D-1 camera-action ] }
-        { T{ key-down f f "2" } [ mvt-3D-2 camera-action ] }
-        { T{ key-down f f "3" } [ mvt-3D-3  camera-action ] }
-        { T{ key-down f f "4" } [ mvt-3D-4  camera-action ] }
-
-    } [ make* ] map >hashtable >>table
-    ;    
-
-! --------------------------------------------
-! print elements 
-! --------------------------------------------
-! print-content
-
-GENERIC: adsoda-display-model ( x -- ) 
-
-M: light adsoda-display-model 
-"\n light : " .
-     { 
-        [ direction>> "direction : " pprint . ] 
-        [ color>> "color : " pprint . ]
-    }   cleave
-    ;
-
-M: face adsoda-display-model 
-     {
-        [ halfspace>> "halfspace : " pprint . ] 
-        [ touching-corners>> "touching corners : " pprint . ]
-    }   cleave
-    ;
-M: solid adsoda-display-model 
-     {
-        [ name>> "solid called : " pprint . ] 
-        [ color>> "color : " pprint . ]
-        [ dimension>> "dimension : " pprint . ]
-        [ faces>> "composed of faces : " pprint 
-            [ adsoda-display-model ] each ]
-    }   cleave
-    ;
-M: space adsoda-display-model 
-     {
-        [ dimension>> "dimension : " pprint . ] 
-        [ ambient-color>> "ambient-color : " pprint . ]
-        [ solids>> "composed of solids : " pprint 
-            [ adsoda-display-model ] each ]
-        [ lights>> "composed of lights : " pprint 
-            [ adsoda-display-model ] each ] 
-    }   cleave
-    ;
-
-! ----------------------------------------------
-: menu-bar ( -- gadget )
-       <shelf>
-          "reinit" [ drop load-model-file ] button* add-gadget
-          selected-file-model> <label-control> add-gadget
-    ;
-
-
-: controller-window* ( -- gadget )
-    { 0 1 } <track>
-        menu-bar f track-add
-        <list-runner>  
-            <limited-scroller>  
-            { 200 400 } >>max-dim
-        f track-add
-        <shelf>
-            "Projection mode : " <label> add-gadget
-            model-projection-chooser add-gadget
-        f track-add
-        <shelf>
-            "Collision detection (slow and buggy ) : " 
-                <label> add-gadget
-            collision-detection-chooser add-gadget
-        f track-add
-        <pile>
-            0.5 >>align    
-            menu-4D add-gadget 
-            light-purple solid-interior
-            "4D movements" <labelled-gadget>
-        f track-add
-        <pile>
-            0.5 >>align
-            { 2 2 } >>gap
-            menu-3D add-gadget
-            light-purple solid-interior 
-            "Camera 3D" <labelled-gadget>
-        f track-add      
-        gray solid-interior
- ;
- 
-: viewer-windows* ( --  )
-    "YZW" view1> win3D 
-    "XZW" view2> win3D 
-    "XYW" view3> win3D 
-    "XYZ" view4> win3D   
-;
-
-: navigator-window* ( -- )
-    controller-window*
-    viewer-windows*   
-    add-keyboard-delegate
-    "navigateur 4D" open-window
-;
-
-: windows ( -- ) [ [ navigator-window* ] with-scope ] with-ui ;
-
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: init-variables ( -- )
-    "choose a file" <model> >selected-file-model  
-    <observer> >observer3d
-    [ observer3d> >self
-      reset-turtle 
-      45 turn-left 
-      45 pitch-up 
-      -300 step-turtle 
-    ] with-scope
-    
-;
-
-
-: init-models ( -- )
-    0 model-projection observer3d> <window3D> >view1
-    1 model-projection observer3d> <window3D> >view2
-    2 model-projection observer3d> <window3D> >view3
-    3 model-projection observer3d> <window3D> >view4
-;
-
-: 4DNav ( -- ) 
-    init-variables
-    selected-file read-model-file >present-space
-    init-models
-    windows
-;
-
-MAIN: 4DNav
-
-
diff --git a/unmaintained/4DNav/authors.txt b/unmaintained/4DNav/authors.txt
deleted file mode 100755
index a6a96933f4..0000000000
--- a/unmaintained/4DNav/authors.txt
+++ /dev/null
@@ -1 +0,0 @@
-Jeff Bigot
\ No newline at end of file
diff --git a/unmaintained/4DNav/camera/authors.txt b/unmaintained/4DNav/camera/authors.txt
deleted file mode 100755
index bbc876e7b6..0000000000
--- a/unmaintained/4DNav/camera/authors.txt
+++ /dev/null
@@ -1 +0,0 @@
-Adam Wendt
diff --git a/unmaintained/4DNav/camera/camera-docs.factor b/unmaintained/4DNav/camera/camera-docs.factor
deleted file mode 100755
index 4898c4e580..0000000000
--- a/unmaintained/4DNav/camera/camera-docs.factor
+++ /dev/null
@@ -1,88 +0,0 @@
-! Copyright (C) 2008 Jean-François Bigot.
-! See http://factorcode.org/license.txt for BSD license.
-USING: help.markup help.syntax kernel ;
-IN: 4DNav.camera
-
-HELP: camera-eye
-{ $values
-    
-     { "point" "position" }
-}
-{ $description "return the position of the camera" } ;
-
-HELP: camera-focus
-{ $values
-    
-     { "point" "position" }
-}
-{ $description "return the point the camera looks at" } ;
-
-HELP: camera-up
-{ $values
-    
-     { "dirvec" "upside direction" }
-}
-{ $description "In order to precise the roling position of camera give an upward vector" } ;
-
-HELP: do-look-at
-{ $values
-     { "camera" "direction" }
-}
-{ $description "Word to use in replacement of gl-look-at when using a camera" } ;
-
-ARTICLE: "4DNav.camera" "Camera"
-{ $vocab-link "4DNav.camera" }
-"\n"
-"A camera is defined by:"
-{ $list
-{ "a position (" { $link camera-eye } ")" }
-{ "a focus direction (" { $link camera-focus } ")\n" }
-{ "an attitude information (" { $link camera-up } ")\n" }
-}
-"\nUse " { $link do-look-at } " in opengl statement in placement of gl-look-at"
-"\n\n"
-"A camera is a " { $vocab-link "4DNav.turtle" } " object. Its a special vocab to handle mouvements of a 3D object:"
-{ $list
-{ "To define a camera"
-{
-    $unchecked-example
-    
-"VAR: my-camera"
-": init-my-camera ( -- )"
-"    <turtle> >my-camera"
-"    [ my-camera> >self"
-"      reset-turtle "
-"    ] with-scope ;"
-} }
-{ "To move it"
-{
-    $unchecked-example
-
-"    [ my-camera> >self"
-"      45 pitch-up "
-"      5 step-turtle" 
-"    ] with-scope "
-} }
-{ "or"
-{
-    $unchecked-example
-
-"    [ my-camera> >self"
-"      5 strafe-left"
-"    ] with-scope "
-}
-}
-{
-"to use it in an opengl statement"
-{
-    $unchecked-example
-  "my-camera> do-look-at"
-
-}
-}
-}
-
-
-;
-
-ABOUT: "4DNav.camera"
diff --git a/unmaintained/4DNav/camera/camera.factor b/unmaintained/4DNav/camera/camera.factor
deleted file mode 100755
index 1e492fe8d9..0000000000
--- a/unmaintained/4DNav/camera/camera.factor
+++ /dev/null
@@ -1,19 +0,0 @@
-USING: kernel namespaces math.vectors opengl 4DNav.turtle 
-self ;
-
-IN: 4DNav.camera
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: camera-eye ( -- point ) turtle-pos> ;
-
-: camera-focus ( -- point ) 
-    [ 1 step-turtle turtle-pos> ] save-self ;
-
-: camera-up ( -- dirvec )
-[ 90 pitch-up turtle-pos> 1 step-turtle turtle-pos> swap v- ] 
-    save-self ;
-
-: do-look-at ( camera -- )
-[ >self camera-eye camera-focus camera-up gl-look-at ] 
-    with-scope ;
diff --git a/unmaintained/4DNav/deep/deep-docs.factor b/unmaintained/4DNav/deep/deep-docs.factor
deleted file mode 100755
index 78439c6c0f..0000000000
--- a/unmaintained/4DNav/deep/deep-docs.factor
+++ /dev/null
@@ -1,31 +0,0 @@
-! Copyright (C) 2008 Jean-François Bigot.
-! See http://factorcode.org/license.txt for BSD license.
-USING: help.markup help.syntax kernel quotations sequences ;
-IN: 4DNav.deep
-
-! HELP: deep-cleave-quots
-! { $values
-!     { "seq" sequence }
-!     { "quot" quotation }
-! }
-! { $description "A word to build a soquence from a sequence of quotation" }
-! 
-! { $examples
-! "It is useful to build matrix"
-! { $example "USING: math math.trig ; "
-!     " 30 deg>rad "
-!    "  {  { [ cos ] [ sin neg ]   0 } "
-!    "     { [ sin ] [ cos ]       0 } "
-!    "     {   0       0           1 } "
-!    "  } deep-cleave-quots " 
-!     " "
-! 
-! 
-! } }
-! ;
-
-ARTICLE: "4DNav.deep" "Deep"
-{ $vocab-link "4DNav.deep" }
-;
-
-ABOUT: "4DNav.deep"
diff --git a/unmaintained/4DNav/deep/deep.factor b/unmaintained/4DNav/deep/deep.factor
deleted file mode 100755
index b18000a84c..0000000000
--- a/unmaintained/4DNav/deep/deep.factor
+++ /dev/null
@@ -1,13 +0,0 @@
-USING: macros quotations math math.functions math.trig 
-sequences.deep kernel make fry combinators grouping ;
-IN: 4DNav.deep
-
-! USING: bake ;
-! MACRO: deep-cleave-quots ( seq -- quot )
-!    [ [ quotation? ] deep-filter ]
-!    [ [ dup quotation? [ drop , ] when ] deep-map ]
-!    bi '[ _ cleave _ bake ] ;
-
-: make-matrix ( quot width -- matrix ) 
-    [ { } make ] dip group ; inline
-
diff --git a/unmaintained/4DNav/deploy.factor b/unmaintained/4DNav/deploy.factor
deleted file mode 100755
index e39f91acf6..0000000000
--- a/unmaintained/4DNav/deploy.factor
+++ /dev/null
@@ -1,15 +0,0 @@
-USING: tools.deploy.config ;
-H{
-    { deploy-c-types? t }
-    { deploy-word-props? t }
-    { deploy-name "4DNav" }
-    { deploy-ui? t }
-    { deploy-math? t }
-    { deploy-threads? t }
-    { deploy-reflection 3 }
-    { deploy-compiler? t }
-    { deploy-unicode? t }
-    { deploy-io 3 }
-    { "stop-after-last-window?" t }
-    { deploy-word-defs? t }
-}
diff --git a/unmaintained/4DNav/file-chooser/authors.txt b/unmaintained/4DNav/file-chooser/authors.txt
deleted file mode 100755
index a6a96933f4..0000000000
--- a/unmaintained/4DNav/file-chooser/authors.txt
+++ /dev/null
@@ -1 +0,0 @@
-Jeff Bigot
\ No newline at end of file
diff --git a/unmaintained/4DNav/file-chooser/file-chooser.factor b/unmaintained/4DNav/file-chooser/file-chooser.factor
deleted file mode 100755
index d7c869ce2f..0000000000
--- a/unmaintained/4DNav/file-chooser/file-chooser.factor
+++ /dev/null
@@ -1,157 +0,0 @@
-! Copyright (C) 2008 Jeff Bigot
-! See http://factorcode.org/license.txt for BSD license.
-USING:
-kernel
-io.files
-io.backend
-io.directories
-io.files.info
-io.pathnames
-sequences
-models
-strings
-ui
-ui.operations
-ui.commands
-ui.gestures
-ui.gadgets
-ui.gadgets.buttons
-ui.gadgets.lists
-ui.gadgets.labels
-ui.gadgets.tracks
-ui.gadgets.packs
-ui.gadgets.panes
-ui.gadgets.scrollers
-prettyprint
-combinators
-rewrite-closures
-accessors
-values
-tools.walker
-fry
-;
-IN: 4DNav.file-chooser
-
-TUPLE: file-chooser < track 
-    path
-    extension 
-    selected-file
-    presenter
-    hook  
-    list
-    ;
-
-: find-file-list ( gadget -- list )
-    [ file-chooser? ] find-parent list>> ;
-
-file-chooser H{
-    { T{ key-down f f "UP" } 
-        [ find-file-list select-previous ] }
-    { T{ key-down f f "DOWN" } 
-        [ find-file-list select-next ] }
-    { T{ key-down f f "PAGE_UP" } 
-        [ find-file-list list-page-up ] }
-    { T{ key-down f f "PAGE_DOWN" } 
-        [ find-file-list list-page-down ] }
-    { T{ key-down f f "RET" } 
-        [ find-file-list invoke-value-action ] }
-    { T{ button-down } 
-        request-focus }
-    { T{ button-down f 1 } 
-        [ find-file-list invoke-value-action ]  }
-} set-gestures
-
-: list-of-files ( file-chooser -- seq )
-     [ path>> value>> directory-entries ] [ extension>> ] bi
-     '[ [ name>> _ [ tail? ] with any? ] 
-     [ directory? ] bi or ]  filter
-;
-
-: update-filelist-model ( file-chooser -- file-chooser )
-    [ list-of-files ] [ model>> ] bi set-model ;
-
-: init-filelist-model ( file-chooser -- file-chooser )
-    dup list-of-files <model> >>model ; 
-
-: (fc-go) ( file-chooser quot -- )
-    [ [ file-chooser? ] find-parent dup path>> ] dip
-    call
-    normalize-path swap set-model
-    update-filelist-model
-    drop ;
-
-: fc-go-parent ( file-chooser -- )
-    [ dup value>> parent-directory ] (fc-go) ;
-
-: fc-go-home ( file-chooser -- )
-    [ home ] (fc-go) ;
-
-: fc-change-directory ( file-chooser file -- file-chooser )
-    dupd [ path>> value>> normalize-path ] [ name>> ] bi* 
-    append-path over path>> set-model    
-    update-filelist-model
-;
-
-: fc-load-file ( file-chooser file -- )
-  dupd [ selected-file>> ] [ name>> ] bi* swap set-model 
-  [ path>> value>> ] 
-  [ selected-file>> value>> append ] 
-  [ hook>> ] tri
-  call
-; inline
-
-! : fc-ok-action ( file-chooser -- quot )
-!  dup selected-file>> value>>  "" =
-!    [ drop [ drop ] ] [    
-!            [ path>> value>> ] 
-!            [ selected-file>> value>> append ] 
-!            [ hook>> prefix ] tri
-!        [ drop ] prepend
-!    ]  if ; 
-
-: line-selected-action ( file-chooser -- )
-     dup list>> list-value
-     dup directory? 
-     [ fc-change-directory ] [ fc-load-file ] if ;
-
-: present-dir-element ( element -- string )
-    [ name>> ] [ directory? ] bi   [ "-> " prepend ] when ;
-
-: <file-list> ( file-chooser -- list )
-  dup [ nip line-selected-action ] curry 
-  [ present-dir-element ] rot model>> <list> ;
-
-: <file-chooser> ( hook path extension -- gadget )
-    { 0 1 } file-chooser new-track
-    swap >>extension
-    swap <model> >>path
-    "" <model> >>selected-file
-    swap >>hook
-    init-filelist-model
-    dup <file-list> >>list
-    "choose a file in directory " <label> f track-add
-    dup path>> <label-control> f track-add
-    dup extension>> ", " join "limited to : " prepend 
-        <label> f track-add
-    <shelf> 
-        "selected file : " <label> add-gadget
-        over selected-file>> <label-control> add-gadget
-    f track-add
-    <shelf> 
-        over [  swap fc-go-parent ] curry  "go up" 
-            swap <bevel-button> add-gadget
-        over [  swap fc-go-home ] curry  "go home" 
-            swap <bevel-button> add-gadget
-    !    over [ swap fc-ok-action ] curry "OK" 
-    !    swap <bevel-button> add-gadget
-    !    [ drop ]  "Cancel" swap <bevel-button> add-gadget
-    f track-add
-    dup list>> <scroller> 1 track-add
-;
-
-M: file-chooser pref-dim* drop { 400 200 } ;
-
-: file-chooser-window ( -- )
-    [ . ] home { "xml" "txt" }   <file-chooser> 
-    "Choose a file" open-window ;
-
diff --git a/unmaintained/4DNav/hypercube.xml b/unmaintained/4DNav/hypercube.xml
deleted file mode 100755
index 0d46e3b315..0000000000
--- a/unmaintained/4DNav/hypercube.xml
+++ /dev/null
@@ -1,37 +0,0 @@
-<model>
-<space>
-	<name>hypercube</name>
-	<dimension>4</dimension>
-	<solid>
-		<name>4cube1</name>
-		<dimension>4</dimension>
-		<face>1,0,0,0,100</face>
-		<face>-1,0,0,0,-150</face>
-		<face>0,1,0,0,100</face>
-		<face>0,-1,0,0,-150</face>
-		<face>0,0,1,0,100</face>
-		<face>0,0,-1,0,-150</face>
-		<face>0,0,0,1,100</face>
-		<face>0,0,0,-1,-150</face>
-		<color>1,0,0</color>
-	</solid>
-	<solid>
-		<name>4cube1</name>
-		<dimension>4</dimension>
-		<face>1,0,0,0,100</face>
-		<face>-1,0,0,0,-150</face>
-		<face>0,1,0,0,100</face>
-		<face>0,-1,0,0,-150</face>
-		<face>0,0,1,0,100</face>
-		<face>0,0,-1,0,-150</face>
-		<face>0,0,0,1,100</face>
-		<face>0,0,0,-1,-150</face>
-		<color>1,0,0</color>
-	</solid>
-	<light>
-		<direction>1,1,1,1</direction>
-		<color>0.2,0.2,0.6</color>
-	</light>
-	<color>0.8,0.9,0.9</color>
-</space>
-</model>
diff --git a/unmaintained/4DNav/light_test.xml b/unmaintained/4DNav/light_test.xml
deleted file mode 100755
index b7d750ddaa..0000000000
--- a/unmaintained/4DNav/light_test.xml
+++ /dev/null
@@ -1,62 +0,0 @@
-<model>
-<space>
-	<name>multi solids</name>
-	<dimension>4</dimension>
-	<solid>
-		<name>4cube1</name>
-		<dimension>4</dimension>
-		<face>1,0,0,0,100</face>
-		<face>-1,0,0,0,-150</face>
-		<face>0,1,0,0,100</face>
-		<face>0,-1,0,0,-150</face>
-		<face>0,0,1,0,100</face>
-		<face>0,0,-1,0,-150</face>
-		<face>0,0,0,1,100</face>
-		<face>0,0,0,-1,-150</face>
-		<color>1,1,1</color>
-	</solid>
-	<solid>
-		<name>4triancube</name>
-		<dimension>4</dimension>
-		<face>1,0,0,0,160</face>
-        	<face>-0.4999999999999998,-0.8660254037844387,0,0,-130</face>
-		<face>-0.5000000000000004,0.8660254037844384,0,0,-130</face>
-		<face>0,0,1,0,140</face>
-		<face>0,0,-1,0,-180</face>
-		<face>0,0,0,1,110</face>
-		<face>0,0,0,-1,-180</face>
-		<color>1,1,1</color>
-	</solid>
-	<solid>
-		<name>triangone</name>
-		<dimension>4</dimension>
-		<face>1,0,0,0,60</face>
-		<face>0.5,0.8660254037844386,0,0,60</face>
-		<face>-0.5,0.8660254037844387,0,0,-20</face>
-		<face>-1.0,0,0,0,-100</face>
-		<face>-0.5,-0.8660254037844384,0,0,-100</face>
-		<face>0.5,-0.8660254037844387,0,0,-20</face>
-		<face>0,0,1,0,120</face>
-        	<face>0,0,-0.4999999999999998,-0.8660254037844387,-120</face>
-		<face>0,0,-0.5000000000000004,0.8660254037844384,-120</face>
-		<color>1,1,1</color>
-	</solid>
-	<light>
-		<direction>1,0,0,0</direction>
-		<color>0,0,0,0.6</color>
-	</light>
-	<light>
-		<direction>0,1,0,0</direction>
-		<color>0,0.6,0,0</color>
-	</light>
-	<light>
-		<direction>0,0,1,0</direction>
-		<color>0,0,0.6,0</color>
-	</light>
-	<light>
-		<direction>0,0,0,1</direction>
-		<color>0.6,0.6,0.6</color>
-	</light>
-	<color>0.99,0.99,0.99</color>
-</space>
-</model>
diff --git a/unmaintained/4DNav/multi solids.xml b/unmaintained/4DNav/multi solids.xml
deleted file mode 100755
index b401e988b9..0000000000
--- a/unmaintained/4DNav/multi solids.xml	
+++ /dev/null
@@ -1,50 +0,0 @@
-<model>
-<space>
-	<name>multi solids</name>
-	<dimension>4</dimension>
-	<solid>
-		<name>4cube1</name>
-		<dimension>4</dimension>
-		<face>1,0,0,0,100</face>
-		<face>-1,0,0,0,-150</face>
-		<face>0,1,0,0,100</face>
-		<face>0,-1,0,0,-150</face>
-		<face>0,0,1,0,100</face>
-		<face>0,0,-1,0,-150</face>
-		<face>0,0,0,1,100</face>
-		<face>0,0,0,-1,-150</face>
-		<color>1,0,0</color>
-	</solid>
-	<solid>
-		<name>4triancube</name>
-		<dimension>4</dimension>
-		<face>1,0,0,0,160</face>
-        	<face>-0.4999999999999998,-0.8660254037844387,0,0,-130</face>
-		<face>-0.5000000000000004,0.8660254037844384,0,0,-130</face>
-		<face>0,0,1,0,140</face>
-		<face>0,0,-1,0,-180</face>
-		<face>0,0,0,1,110</face>
-		<face>0,0,0,-1,-180</face>
-		<color>0,1,0</color>
-	</solid>
-	<solid>
-		<name>triangone</name>
-		<dimension>4</dimension>
-		<face>1,0,0,0,60</face>
-		<face>0.5,0.8660254037844386,0,0,60</face>
-		<face>-0.5,0.8660254037844387,0,0,-20</face>
-		<face>-1.0,0,0,0,-100</face>
-		<face>-0.5,-0.8660254037844384,0,0,-100</face>
-		<face>0.5,-0.8660254037844387,0,0,-20</face>
-		<face>0,0,1,0,120</face>
-        	<face>0,0,-0.4999999999999998,-0.8660254037844387,-120</face>
-		<face>0,0,-0.5000000000000004,0.8660254037844384,-120</face>
-		<color>0,1,1</color>
-	</solid>
-	<light>
-		<direction>1,1,1,1</direction>
-		<color>0.2,0.2,0.6</color>
-	</light>
-	<color>0.8,0.9,0.9</color>
-</space>
-</model>
diff --git a/unmaintained/4DNav/prismetriagone.xml b/unmaintained/4DNav/prismetriagone.xml
deleted file mode 100755
index cbdc071f97..0000000000
--- a/unmaintained/4DNav/prismetriagone.xml
+++ /dev/null
@@ -1,25 +0,0 @@
-<model>
-<space>
-	<name>Prismetragone</name>		
-	<dimension>4</dimension>
-	<solid>
-		<name>triangone</name>
-		<dimension>4</dimension>
-		<face>1,0,0,0,60</face>
-		<face>0.5,0.8660254037844386,0,0,60</face>
-		<face>-0.5,0.8660254037844387,0,0,-20</face>
-		<face>-1.0,0,0,0,-100</face>
-		<face>-0.5,-0.8660254037844384,0,0,-100</face>
-		<face>0.5,-0.8660254037844387,0,0,-20</face>
-		<face>0,0,1,0,120</face>
-        	<face>0,0,-0.4999999999999998,-0.8660254037844387,-120</face>
-		<face>0,0,-0.5000000000000004,0.8660254037844384,-120</face>
-		<color>0,1,1</color>
-	</solid>
-	<light>
-		<direction>1,1,1,1</direction>
-		<color>0.2,0.2,0.6</color>
-	</light>
-	<color>0.8,0.9,0.9</color>
-</space>
-</model>
diff --git a/unmaintained/4DNav/space-file-decoder/authors.txt b/unmaintained/4DNav/space-file-decoder/authors.txt
deleted file mode 100755
index a6a96933f4..0000000000
--- a/unmaintained/4DNav/space-file-decoder/authors.txt
+++ /dev/null
@@ -1 +0,0 @@
-Jeff Bigot
\ No newline at end of file
diff --git a/unmaintained/4DNav/space-file-decoder/space-file-decoder-docs.factor b/unmaintained/4DNav/space-file-decoder/space-file-decoder-docs.factor
deleted file mode 100755
index 0a7816636f..0000000000
--- a/unmaintained/4DNav/space-file-decoder/space-file-decoder-docs.factor
+++ /dev/null
@@ -1,20 +0,0 @@
-! Copyright (C) 2008 Jean-François Bigot.
-! See http://factorcode.org/license.txt for BSD license.
-USING: help.markup help.syntax kernel ;
-IN: 4DNav.space-file-decoder
-
-
-
-HELP: read-model-file
-{ $values
-    
-     { "path" "path to the file to read" }
-     { "x" "value" }
-}
-{ $description "Read a file containing the xml description of the model" } ;
-
-ARTICLE: "4DNav.space-file-decoder" "Space XMLfile decoder"
-{ $vocab-link "4DNav.space-file-decoder" }
-;
-
-ABOUT: "4DNav.space-file-decoder"
diff --git a/unmaintained/4DNav/space-file-decoder/space-file-decoder.factor b/unmaintained/4DNav/space-file-decoder/space-file-decoder.factor
deleted file mode 100755
index 872ddbcee3..0000000000
--- a/unmaintained/4DNav/space-file-decoder/space-file-decoder.factor
+++ /dev/null
@@ -1,66 +0,0 @@
-! Copyright (C) 2008 Jeff Bigot
-! See http://factorcode.org/license.txt for BSD license.
-USING: adsoda xml xml.utilities xml.dispatch accessors 
-combinators sequences math.parser kernel splitting values 
-continuations ;
-IN: 4DNav.space-file-decoder
-
-: decode-number-array ( x -- y )  
-    "," split [ string>number ] map ;
-
-PROCESS: adsoda-read-model ( tag -- )
-
-TAG: dimension adsoda-read-model 
-    children>> first string>number ;
-TAG: direction adsoda-read-model 
-    children>> first decode-number-array ;
-TAG: color     adsoda-read-model 
-    children>> first decode-number-array ;
-TAG: name      adsoda-read-model 
-    children>> first ;
-TAG: face      adsoda-read-model 
-    children>> first decode-number-array ;
-
-TAG: solid adsoda-read-model 
-    <solid> swap  
-    { 
-        [ "dimension" tag-named adsoda-read-model >>dimension ]
-        [ "name"      tag-named adsoda-read-model >>name ] 
-        [ "color"     tag-named adsoda-read-model >>color ] 
-        [ "face"      
-            tags-named [ adsoda-read-model cut-solid ] each ] 
-    } cleave
-    ensure-adjacencies
-;
-
-TAG: light adsoda-read-model 
-   <light> swap  
-    { 
-        [ "direction" tag-named adsoda-read-model >>direction ]
-        [ "color"     tag-named adsoda-read-model >>color ] 
-    } cleave
-;
-
-TAG: space adsoda-read-model 
-    <space> swap  
-    { 
-        [ "dimension" tag-named adsoda-read-model >>dimension ]
-        [ "name"      tag-named adsoda-read-model >>name ] 
-        [ "color"     tag-named 
-            adsoda-read-model >>ambient-color ] 
-        [ "solid"     tags-named 
-            [ adsoda-read-model suffix-solids ] each ] 
-        [ "light"     tags-named 
-            [ adsoda-read-model suffix-lights ] each ]
-    } cleave
-;
-
-: read-model-file ( path -- x )
-  dup
-  [
-    [ file>xml "space" tags-named first adsoda-read-model ] 
-    [ drop <space> ] recover 
-  ] [  drop <space> ] if 
-
-;
-
diff --git a/unmaintained/4DNav/summary.txt b/unmaintained/4DNav/summary.txt
deleted file mode 100755
index 5b5a452cde..0000000000
--- a/unmaintained/4DNav/summary.txt
+++ /dev/null
@@ -1 +0,0 @@
-4DNav : simmple tool to navigate thru a 4D space view as projections on 4 3D spaces.
\ No newline at end of file
diff --git a/unmaintained/4DNav/tags.txt b/unmaintained/4DNav/tags.txt
deleted file mode 100755
index 0c63a72fc9..0000000000
--- a/unmaintained/4DNav/tags.txt
+++ /dev/null
@@ -1 +0,0 @@
-4D viewer
\ No newline at end of file
diff --git a/unmaintained/4DNav/triancube.xml b/unmaintained/4DNav/triancube.xml
deleted file mode 100755
index 8551bed24c..0000000000
--- a/unmaintained/4DNav/triancube.xml
+++ /dev/null
@@ -1,23 +0,0 @@
-<model>
-<space>
-	<name>triancube</name>		
-	<dimension>4</dimension>
-	<solid>
-		<name>triancube</name>
-		<dimension>4</dimension>
-		<face>1,0,0,0,160</face>
-        	<face>-0.4999999999999998,-0.8660254037844387,0,0,-130</face>
-		<face>-0.5000000000000004,0.8660254037844384,0,0,-130</face>
-		<face>0,0,1,0,140</face>
-		<face>0,0,-1,0,-180</face>
-		<face>0,0,0,1,110</face>
-		<face>0,0,0,-1,-180</face>
-		<color>0,1,0</color>
-	</solid>
-	<light>
-		<direction>1,1,1,1</direction>
-		<color>0.2,0.2,0.6</color>
-	</light>
-	<color>0.8,0.9,0.9</color>
-</space>
-</model>
diff --git a/unmaintained/4DNav/turtle/authors.txt b/unmaintained/4DNav/turtle/authors.txt
deleted file mode 100755
index 6cfd5da273..0000000000
--- a/unmaintained/4DNav/turtle/authors.txt
+++ /dev/null
@@ -1 +0,0 @@
-Eduardo Cavazos
diff --git a/unmaintained/4DNav/turtle/turtle-docs.factor b/unmaintained/4DNav/turtle/turtle-docs.factor
deleted file mode 100755
index b94ed99673..0000000000
--- a/unmaintained/4DNav/turtle/turtle-docs.factor
+++ /dev/null
@@ -1,11 +0,0 @@
-! Copyright (C) 2008 Jean-François Bigot.
-! See http://factorcode.org/license.txt for BSD license.
-USING: arrays help.markup help.syntax kernel sequences ;
-IN: 4DNav.turtle
-
-
-ARTICLE: "4DNav.turtle" "Turtle"
-{ $vocab-link "4DNav.turtle" }
-;
-
-ABOUT: "4DNav.turtle"
diff --git a/unmaintained/4DNav/turtle/turtle.factor b/unmaintained/4DNav/turtle/turtle.factor
deleted file mode 100755
index 62c25c4344..0000000000
--- a/unmaintained/4DNav/turtle/turtle.factor
+++ /dev/null
@@ -1,154 +0,0 @@
-USING: kernel math arrays math.vectors math.matrices
-namespaces make
-math.constants math.functions
-math.vectors
-splitting grouping self math.trig
-  sequences accessors 4DNav.deep models ;
-IN: 4DNav.turtle
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-TUPLE: turtle pos ori ;
-
-: <turtle> ( -- turtle )
-    turtle new
-    { 0 0 0 } clone >>pos
-    3 identity-matrix >>ori
-;
-
-
-TUPLE: observer < turtle projection-mode collision-mode ;
-
-: <observer> ( -- object ) 
-     observer new
-    0 <model> >>projection-mode 
-    f <model> >>collision-mode
-    ;
-
-
-: turtle-pos> ( -- val ) self> pos>> ;
-: >turtle-pos ( val -- ) self> (>>pos) ;
-
-: turtle-ori> ( -- val ) self> ori>> ;
-: >turtle-ori ( val -- ) self> (>>ori) ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-! These rotation matrices are from
-! `Computer Graphics: Principles and Practice'
-
-
-! waiting for deep-cleave-quots  
-
-! : Rz ( angle -- Rx ) deg>rad
-!    {   { [ cos ] [ sin neg ]   0 }
-!        { [ sin ] [ cos ]      0  }
-!        {   0       0           1 } 
-!    } deep-cleave-quots  ;
-
-! : Ry ( angle -- Ry ) deg>rad
-!    {   { [ cos ]      0 [ sin ] }
-!        {   0          1 0       }
-!        { [  sin neg ] 0 [ cos ] }
-!    } deep-cleave-quots  ;
-  
-! : Rx ( angle -- Rz ) deg>rad
-!   {   { 1     0        0        }
-!        { 0   [ cos ] [ sin neg ] }
-!        { 0   [ sin ] [ cos ]     }
-!    } deep-cleave-quots ;
-
-: Rz ( angle -- Rx ) deg>rad
-[ dup cos ,     dup sin neg ,   0 ,
-  dup sin ,     dup cos ,       0 ,
-  0 ,           0 ,             1 , ] 3 make-matrix nip ;
-
-: Ry ( angle -- Ry ) deg>rad
-[ dup cos ,     0 ,             dup sin ,
-  0 ,           1 ,             0 ,
-  dup sin neg , 0 ,             dup cos , ] 3 make-matrix nip ;
-
-: Rx ( angle -- Rz ) deg>rad
-[ 1 ,           0 ,             0 ,
-  0 ,           dup cos ,       dup sin neg ,
-  0 ,           dup sin ,       dup cos , ] 3 make-matrix nip ;
-
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: apply-rotation ( rotation -- ) 
-    turtle-ori> swap m. >turtle-ori ;
-: rotate-x ( angle -- ) Rx apply-rotation ;
-: rotate-y ( angle -- ) Ry apply-rotation ;
-: rotate-z ( angle -- ) Rz apply-rotation ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: pitch-up   ( angle -- ) neg rotate-x ;
-: pitch-down ( angle -- )     rotate-x ;
-
-: turn-left ( angle -- )      rotate-y ;
-: turn-right ( angle -- ) neg rotate-y ;
-
-: roll-left  ( angle -- ) neg rotate-z ;
-: roll-right ( angle -- )     rotate-z ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-! roll-until-horizontal
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: V ( -- V ) { 0 1 0 } ;
-
-: X ( -- 3array ) turtle-ori> [ first  ] map ;
-: Y ( -- 3array ) turtle-ori> [ second ] map ;
-: Z ( -- 3array ) turtle-ori> [ third  ] map ;
-
-: set-X ( seq -- ) turtle-ori> [ set-first ] 2each ;
-: set-Y ( seq -- ) turtle-ori> [ set-second ] 2each ;
-: set-Z ( seq -- ) turtle-ori> [ set-third ] 2each ;
-
-: roll-until-horizontal ( -- )
-    V Z cross normalize set-X
-    Z X cross normalize set-Y ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: distance ( turtle turtle -- n ) 
-    pos>> swap pos>> v- [ sq ] map sum sqrt ;
-
-: move-by ( point -- ) turtle-pos> v+ >turtle-pos ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: reset-turtle ( -- ) 
-    { 0 0 0 } clone >turtle-pos 3 identity-matrix >turtle-ori ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: step-vector ( length -- array ) { 0 0 1 } n*v ;
-
-: step-turtle ( length -- ) 
-    step-vector turtle-ori> swap m.v 
-    turtle-pos> v+ >turtle-pos ;
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-: strafe-up ( length -- )
-    90 pitch-up
-    step-turtle
-    90 pitch-down ;
-
-: strafe-down ( length -- )
-    90 pitch-down
-    step-turtle
-    90 pitch-up ;
-
-: strafe-left ( length -- )
-    90 turn-left
-    step-turtle
-    90 turn-right ;
-
-: strafe-right ( length -- )
-    90 turn-right
-    step-turtle
-    90 turn-left ;
diff --git a/unmaintained/4DNav/window3D/authors.txt b/unmaintained/4DNav/window3D/authors.txt
deleted file mode 100755
index a6a96933f4..0000000000
--- a/unmaintained/4DNav/window3D/authors.txt
+++ /dev/null
@@ -1 +0,0 @@
-Jeff Bigot
\ No newline at end of file
diff --git a/unmaintained/4DNav/window3D/window3D-docs.factor b/unmaintained/4DNav/window3D/window3D-docs.factor
deleted file mode 100755
index a534d2e9ec..0000000000
--- a/unmaintained/4DNav/window3D/window3D-docs.factor
+++ /dev/null
@@ -1,12 +0,0 @@
-! Copyright (C) 2008 Jean-François Bigot.
-! See http://factorcode.org/license.txt for BSD license.
-USING: help.markup help.syntax kernel ;
-IN: 4DNav.window3D
-
-
-
-ARTICLE: "4DNav.window3D" "Window3D"
-{ $vocab-link "4DNav.window3D" }
-;
-
-ABOUT: "4DNav.window3D"
diff --git a/unmaintained/4DNav/window3D/window3D.factor b/unmaintained/4DNav/window3D/window3D.factor
deleted file mode 100755
index a5ca5f2a9a..0000000000
--- a/unmaintained/4DNav/window3D/window3D.factor
+++ /dev/null
@@ -1,83 +0,0 @@
-! Copyright (C) 2008 Jeff Bigot
-! See http://factorcode.org/license.txt for BSD license.
-USING: kernel 
-ui.gadgets
-ui.render
-opengl
-opengl.gl
-opengl.glu
-4DNav.camera
-4DNav.turtle
-math
-values
-alien.c-types
-accessors
-namespaces
-adsoda 
-models
-accessors
-prettyprint
-;
-
-IN: 4DNav.window3D
-
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-! drawing functions 
-! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-
-TUPLE: window3D  < gadget observer ; 
-
-: <window3D>  ( model observer -- gadget )
-    window3D  new-gadget 
-    swap 2dup 
-    projection-mode>> add-connection
-    2dup 
-    collision-mode>> add-connection
-    >>observer 
-    swap <model> >>model 
-    t >>root?
-;
-
-M: window3D pref-dim* ( gadget -- dim )  drop { 300 300 } ;
-
-M: window3D draw-gadget* ( gadget -- )
-
-    GL_PROJECTION glMatrixMode
-        glLoadIdentity
-        0.6 0.6 0.6 .9 glClearColor
-        dup observer>> projection-mode>> value>> 1 =    
-        [ 60.0 1.0 0.1 3000.0 gluPerspective ]
-        [ -400.0 400.0 -400.0 400.0 0.0 4000.0 glOrtho ] if
-        dup observer>> collision-mode>> value>> 
-        \ remove-hidden-solids?   
-        set-value
-        dup  observer>> do-look-at
-        GL_MODELVIEW glMatrixMode
-            glLoadIdentity  
-            0.9 0.9 0.9 1.0 glClearColor
-            1.0 glClearDepth
-            GL_LINE_SMOOTH glEnable
-            GL_BLEND glEnable
-            GL_DEPTH_TEST glEnable       
-            GL_LEQUAL glDepthFunc
-            GL_SRC_ALPHA GL_ONE_MINUS_SRC_ALPHA glBlendFunc
-            GL_LINE_SMOOTH_HINT GL_NICEST glHint
-            1.25 glLineWidth
-            GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT bitor 
-                glClear
-            glLoadIdentity
-            GL_LIGHTING glEnable
-            GL_LIGHT0 glEnable
-            GL_COLOR_MATERIAL glEnable
-            GL_FRONT GL_AMBIENT_AND_DIFFUSE glColorMaterial
-            ! *************************
-            
-            model>> value>> 
-            [ space->GL ] when*
-
-            ! *************************
-;
-
-M: window3D graft* drop ;
-
-M: window3D model-changed nip relayout ; 
diff --git a/unmaintained/adsoda/adsoda-docs.factor b/unmaintained/adsoda/adsoda-docs.factor
deleted file mode 100755
index 9ab874d370..0000000000
--- a/unmaintained/adsoda/adsoda-docs.factor
+++ /dev/null
@@ -1,299 +0,0 @@
-! Copyright (C) 2008 Jeff Bigot
-! See http://factorcode.org/license.txt for BSD license.
-USING: help.markup help.syntax ;
-
-IN: adsoda
-
-
-
-! --------------------------------------------------------------
-! faces
-! --------------------------------------------------------------
-ARTICLE: "face-page" "Face in ADSODA"
-"explanation of faces"
-$nl
-"link to functions"
-"what is an halfspace"
-"halfspace touching-corners adjacent-faces"
-"touching-corners list of pointers to the corners which touch this face\n"
-
-"adjacent-faces list of pointers to the faces which touch this face\n"
-{ $subsection face }
-{ $subsection <face> }
-"test relative position"
-{ $subsection point-inside-or-on-face? } 
-{ $subsection point-inside-face? }
-"handling face"
-{ $subsection flip-face }
-{ $subsection face-translate  }
-{ $subsection  face-transform }
-
-;
-
-HELP: face
-{ $class-description "a face is defined by"
-{ $list "halfspace equation" }
-{ $list "list of touching corners" }
-{ $list "list of adjacent faces" }
-$nl
-"Touching corners and adjacent faces are defined by algorithm thanks to other faces of the solid"
-}
-
-
-;
-HELP: <face> 
-{ $values { "v" "an halfspace equation" } { "tuple" "a face" }  }   ;
-HELP: flip-face 
-{ $values { "face" "a face" } { "face" "flipped face" } }
-{ $description "change the orientation of a face" }
-;
-
-HELP: face-translate 
-{ $values { "face" "a face" } { "v" "a vector" } }
-{ $description 
-"translate a face following a vector"
-$nl
-"a translation of an halfspace doesn't change the normal vector. this word just compute the new constant term" }
-
- 
- ;
-HELP: face-transform 
-{ $values { "face" "a face" } { "m" "a transformation matrix" } }
-{ $description  "compute the transformation of a face using a transformation matrix" }
- 
- ;
-! --------------------------------
-! solid
-! --------------------------------------------------------------
-ARTICLE: "solid-page" "Solid in ADSODA"
-"explanation of solids"
-$nl
-"link to functions"
-{ $subsection solid }
-{ $subsection <solid> }
-"test relative position"
-{ $subsection point-inside-solid? }
-{ $subsection point-inside-or-on-solid? }
-"playing with faces and solids"
-{ $subsection add-face }
-{ $subsection cut-solid }
-{ $subsection slice-solid }
-"solid handling"
-{ $subsection solid-project }
-{ $subsection solid-translate }
-{ $subsection solid-transform }
-{ $subsection subtract }
-
-{ $subsection get-silhouette  }
-
-{ $subsection  solid= }
-
-
-;
-
-HELP: solid 
-{ $class-description "dimension" $nl "silhouettes" $nl "faces" $nl "corners" $nl "adjacencies-valid" $nl "color" $nl "name" 
-}
-;
-
-HELP: add-face 
-{ $values { "solid" "a solid" } { "face" "a face" } }
-{ $description "reshape a solid with a face. The face truncate the solid." } ;
-
-HELP: cut-solid
-{ $values { "solid" "a solid" } { "halfspace" "an halfspace" } }
-{ $description "like add-face but just with halfspace equation" } ;
-
-HELP: slice-solid
-{ $values { "solid" "a solid" } { "face" "a face" } { "solid1" "the outer part of the former solid" } { "solid2" "the inner part of the former solid" } }
-{ $description "cut a solid into two parts. The face acts like a knife"
-}  ;
-
-
-HELP: solid-project
-{ $values { "lights" "lights" } { "ambient" "ambient" } { "solid" "solid" } { "solids" "projection of solid" } }
-{ $description "Project the solid using pv vector" 
-$nl
-"TODO: explain how to use lights"
-} ;
-
-HELP: solid-translate 
-{ $values { "solid" "a solid" } { "v" "translating vector" } }
-{ $description "Translate a solid using a vector" 
-$nl
-"v and solid must have the same dimension "
-} ;
-
-HELP: solid-transform 
-{ $values { "solid" "a solid" } { "m" "transformation matrix" } }
-{ $description "Transform a solid using a matrix"
-$nl
-"v and solid must have the same dimension "
-} ;
-
-HELP: subtract 
-{ $values { "solid1" "initial shape" } { "solid2" "shape to remove" } { "solids" "resulting shape" } }
-{ $description  "Substract solid2 from solid1" } ;
-
-
-! --------------------------------------------------------------
-! space 
-! --------------------------------------------------------------
-ARTICLE: "space-page" "Space in ADSODA"
-"A space is a collection of solids and lights."
-$nl
-"link to functions"
-$nl
-"Defining words"
-{ $subsection space }
-{ $subsection <space> } 
-{ $subsection suffix-solids  }
-{ $subsection suffix-lights }
-{ $subsection clear-space-solids  }
-{ $subsection describe-space }
-
-
-"Handling space"
-{ $subsection space-ensure-solids }
-{ $subsection eliminate-empty-solids  }
-{ $subsection space-transform }
-{ $subsection space-translate }
-{ $subsection remove-hidden-solids }
-{ $subsection space-project }
-
-
-;
-
-HELP: space 
-{ $class-description 
-"dimension" $nl " solids" $nl " ambient-color" $nl "lights" 
-}
-;
-
-HELP: suffix-solids 
-"( space solid -- space )"
-{ $values { "space" "a space" } { "solid" "a solid to add" } }
-{ $description "Add solid to space definition" } ;
-
-HELP: suffix-lights 
-"( space light -- space ) "
-{ $values { "space" "a space" } { "light" "a light to add" } }
-{ $description "Add a light to space definition" } ;
-
-HELP: clear-space-solids 
-"( space -- space )"   
-{ $values { "space" "a space" } }
-{ $description "remove all solids in space" } ;
-
-HELP: space-ensure-solids 
-{ $values { "space" "a space" } }
-{ $description "rebuild corners of all solids in space" } ;
-
-
-
-HELP: space-transform 
-" ( space m -- space )" 
-{ $values { "space" "a space" } { "m" "a matrix" } }
-{ $description "Transform a space using a matrix" } ;
-
-HELP: space-translate 
-{ $values { "space" "a space" } { "v" "a vector" } }
-{ $description "Translate a space following a vector" } ;
-
-HELP: describe-space " ( space -- )"
-{ $values { "space" "a space" } }
-{ $description "return a description of space" } ;
-
-HELP: space-project 
-{ $values { "space" "a space" } { "i" "an integer" } }
-{ $description "Project a space along ith coordinate" } ;
-
-! --------------------------------------------------------------
-! 3D rendering
-! --------------------------------------------------------------
-ARTICLE: "3D-rendering-page" "The 3D rendering in ADSODA"
-"explanation of 3D rendering"
-$nl
-"link to functions"
-{ $subsection face->GL }
-{ $subsection solid->GL }
-{ $subsection space->GL }
-
-;
-
-HELP: face->GL 
-{ $values { "face" "a face" } { "color" "3 3 values array" } }
-{ $description "display a face" } ;
-
-HELP: solid->GL 
-{ $values { "solid" "a solid" } }
-{ $description "display a solid" } ;
-
-HELP: space->GL 
-{ $values { "space" "a space" } }
-{ $description "display a space" } ;
-
-! --------------------------------------------------------------
-! light
-! --------------------------------------------------------------
-
-ARTICLE: "light-page" "Light in ADSODA"
-"explanation of light"
-$nl
-"link to functions"
-;
-
-ARTICLE: { "adsoda" "light" } "ADSODA : lights"
-"! HELP: light position color" 
-"! <light> ( -- tuple ) light new ;"
-
-"! light est un vecteur avec 3 variables pour les couleurs\n"
-
-" void Light::Apply(Vector& normal, double &cRed, double &cGreen, double &cBlue)\n"
-" { \n"
-"   // Dot the light direction with the normalized normal of Face."
-"   register double intensity = -(normal * (*this));"
-
-"   // Face is a backface, from light's perspective"
-"   if (intensity < 0)"
-"     return;"
-"   "
-"   // Add the intensity componentwise"
-"   cRed += red * intensity;"
-"   cGreen += green * intensity;"
-"   cBlue += blue * intensity;"
-
-"   // Clip to unit range"
-"  if (cRed > 1.0) cRed = 1.0;"
-"   if (cGreen > 1.0) cGreen = 1.0;"
-"   if (cBlue > 1.0) cBlue = 1.0;"
-
-
-;
-
-
-
-ARTICLE: { "adsoda" "halfspace" } "ADSODA : halfspace"
-" defined by the concatenation of the normal vector and a constant"  
- ;
-
-
-
-ARTICLE:  "adsoda-main-page"  "ADSODA : Arbitrary-Dimensional Solid Object Display Algorithm"
-"multidimensional handler :" 
-$nl
-"design a solid using face delimitations. Only works on convex shapes"
-$nl
-{ $emphasis "written in C++ by Greg Ferrar" }
-$nl
-"full explanation on adsoda page at " { $url "http://www.flowerfire.com/ADSODA/" }
-$nl
-"Useful words are describe on the following pages: "
-{ $subsection "face-page" }
-{ $subsection "solid-page" }
-{ $subsection "space-page" }
-{ $subsection "light-page" }
-{ $subsection "3D-rendering-page" }
- ;
-
-ABOUT: "adsoda-main-page"
diff --git a/unmaintained/adsoda/adsoda-tests.factor b/unmaintained/adsoda/adsoda-tests.factor
deleted file mode 100755
index f8881dfebb..0000000000
--- a/unmaintained/adsoda/adsoda-tests.factor
+++ /dev/null
@@ -1,310 +0,0 @@
-USING: adsoda
-kernel
-math
-accessors
-sequences
-    adsoda.solution2
-    fry
-    tools.test 
-    arrays ;
-
-IN: adsoda.tests
-
-
-
-: s1 ( -- solid )
-    <solid> 
-    2 >>dimension
-    "s1" >>name
-    { 1 1 1 } >>color
-    { 1 -1 -5 } cut-solid 
-    { -1 -1 -21 } cut-solid 
-    { -1 0 -12 } cut-solid 
-    { 1 2 16 } cut-solid
-;
-: solid1 ( -- solid )
-    <solid> 
-    2 >>dimension
-    "solid1" >>name
-    { 1 -1 -5 } cut-solid 
-    { -1 -1 -21 } cut-solid 
-    { -1 0 -12 } cut-solid 
-    { 1 2 16 } cut-solid
-    ensure-adjacencies
-    
-;
-: solid2 ( -- solid )
-    <solid> 
-    2 >>dimension
-    "solid2" >>name
-    { -1 1 -10 } cut-solid 
-    { -1 -1 -28 } cut-solid 
-    { 1 0 13 } cut-solid 
- !   { 1 2 16 } cut-solid
-    ensure-adjacencies
-    
-;
-
-: solid3 ( -- solid )
-      <solid> 
-    2 >>dimension
-    "solid3" >>name
-    { 1 1 1 } >>color
-    { 1 0 16 } cut-solid 
-    { -1 0 -36 } cut-solid 
-    { 0 1 1 } cut-solid 
-    { 0 -1  -17 } cut-solid 
- !   { 1 2 16 } cut-solid
-    ensure-adjacencies
-    
-
-;
-
-: solid4 ( -- solid )
-      <solid> 
-    2 >>dimension
-    "solid4" >>name
-    { 1 1 1 } >>color
-    { 1 0 21 } cut-solid 
-    { -1 0 -36 } cut-solid 
-    { 0 1 1 } cut-solid 
-    { 0 -1  -17 } cut-solid 
-    ensure-adjacencies
-    
-;
-
-: solid5 ( -- solid )
-      <solid> 
-    2 >>dimension
-    "solid5" >>name
-    { 1 1 1 } >>color
-    { 1 0 6 } cut-solid 
-    { -1 0 -17 } cut-solid 
-    { 0 1 17 } cut-solid 
-    { 0 -1  -19 } cut-solid 
-    ensure-adjacencies
-    
-;
-
-: solid7 ( -- solid )
-      <solid> 
-    2 >>dimension
-    "solid7" >>name
-    { 1 1 1 } >>color
-    { 1 0 38 } cut-solid 
-    { 1 -5 -66 } cut-solid 
-    { -2 1 -75 } cut-solid
-    ensure-adjacencies
-    
-;
-
-: solid6s ( -- seq )
-  solid3 clone solid2 clone subtract
-;
-
-: space1 ( -- space )
-    <space>
-        2 >>dimension
-     !    solid3 suffix-solids
-        solid1 suffix-solids
-        solid2 suffix-solids
-    !   solid6s [ suffix-solids ] each 
-        solid4 suffix-solids
-     !   solid5 suffix-solids
-        solid7 suffix-solids
-        { 1 1 1 } >>ambient-color
-            <light>
-        { -100 -100 } >>position
-        { 0.2 0.7 0.1 } >>color
-        suffix-lights
-;
-
-: space2 ( -- space )
-    <space>
-        4 >>dimension
-       ! 4cube suffix-solids
-        { 1 1 1 } >>ambient-color
-            <light>
-        { -100 -100 } >>position
-        { 0.2 0.7 0.1 } >>color
-        suffix-lights
-
-       ;
-
-
-
-! {
-!        { 1 0 0 0 }
-!        { 0 1 0 0 }
-!        { 0 0 0.984807753012208 -0.1736481776669303 }
-!        { 0 0 0.1736481776669303 0.984807753012208 }
-!    }
-
-! ------------------------------------------------------------
-! constant+
-[ { 1 2 5 } ] [ { 1 2 3 } 2 constant+ ] unit-test
-
-! ------------------------------------------------------------
-! translate
-[ { 1 -1 0 } ] [ { 1 -1 -5 } { 3 -2 } translate ] unit-test
-
-! ------------------------------------------------------------
-! transform
-[ { -1 -1 -5 21.0 } ] [ { -1 -1 -5 21 }
-  { { 1 0 0 }
-    { 0 1 0 }
-    { 0 0 1 }
-    } transform  
-] unit-test
-
-! ------------------------------------------------------------
-! compare-nleft-to-identity-matrix
-[ t ] [ 
-    { 
-        { 1 0 0 1232 } 
-        { 0 1 0 0 321 } 
-        { 0 0 1 0 } } 
-        3 compare-nleft-to-identity-matrix 
-]  unit-test
-
-[ f ] [ 
-    { { 1 0 0 } { 0 1 0 } { 0 0 0 } } 
-    3 compare-nleft-to-identity-matrix 
-] unit-test
-
-[ f ] [ 
-    { { 2 0 0 } { 0 1 0 } { 0 0 1 } } 
-    3 compare-nleft-to-identity-matrix 
-] unit-test
-! ------------------------------------------------------------
-[ t ] [ 
-  { { 1 0 0 }
-    { 0 1 0 }
-    { 0 0 1 } } 3 valid-solution? 
-] unit-test
-
-[ f ] [ 
-  { { 1 0 0 1 }
-    { 0 0 0 1 }
-    { 0 0 1 0 } } 3 valid-solution? 
-] unit-test
-
-[ f ] [ 
-  { { 1 0 0 1 }
-    { 0 0 0 1 } } 3 valid-solution? 
-] unit-test
-
-[ f ] [ 
-  { { 1 0 0 1 }
-    { 0 0 0 1 }
-    { 0 0 1 0 } } 2 valid-solution? 
-] unit-test
-
-! ------------------------------------------------------------
-[ 3 ] [ { 1 2 3 } last ] unit-test 
-
-[ { 1 2 5 } ] [ { 1 2 3 } dup [ 2 + ] change-last ] unit-test 
-
-! ------------------------------------------------------------
-! position-point 
-[ 0 ] [ 
-    { 1 -1 -5 } { 2 7 } position-point 
-] unit-test
-
-! ------------------------------------------------------------
-
-! transform
-! TODO construire un exemple
-
-
-! ------------------------------------------------------------
-! slice-solid 
-
-! ------------------------------------------------------------
-! solve-equation 
-! deux cas de tests, avec solution et sans solution
-
-[ { 2 7 } ] 
-[ { { 1 -1 -5 } { 1 2 16 } } intersect-hyperplanes ] 
-unit-test
-
-[ f ] 
-[ { { 1 -1 -5 } { 1 2 16 } { -1 -1 -21 } } intersect-hyperplanes  ]
-unit-test
-
-[ f ] 
-[ { { 1 0 -5 } { 1 0 16 }  } intersect-hyperplanes  ]
-unit-test
-
-! ------------------------------------------------------------
-! point-inside-halfspace
-[ t ] [ { 1 -1 -5 } { 0 0 }  point-inside-halfspace? ] 
-unit-test
-[ f ] [ { 1 -1 -5 } { 8 13 }  point-inside-halfspace? ] 
-unit-test
-[ t ] [ { 1 -1 -5 } { 8 13 }  point-inside-or-on-halfspace? ] 
-unit-test
-
-
-! ------------------------------
-! order solid
-
-[  1 ] [ 0 >pv solid1 solid2 order-solid ] unit-test
-[ -1 ] [ 0 >pv solid2 solid1 order-solid ] unit-test
-[  f ] [ 1 >pv solid1 solid2 order-solid ] unit-test
-[  f ] [ 1 >pv solid2 solid1 order-solid ] unit-test
-
-
-! clip-solid
-[ { { 13 15 } { 15 13 } { 13 13 } } ]
-    [ 0 >pv solid2 solid1 clip-solid first corners>> ] unit-test
-
-solid1 corners>> '[ _ ]
-    [ 0 >pv solid1 solid1 clip-solid first corners>> ] unit-test
-
-solid1 corners>> '[ _ ]
-    [ 0 >pv solid1 solid2 clip-solid first corners>> ] unit-test
-
-solid1 corners>> '[ _ ]
-    [ 1 >pv solid1 solid2 clip-solid first corners>> ] unit-test
-solid2 corners>> '[ _ ]
-    [ 1 >pv solid2 solid1 clip-solid first corners>> ] unit-test
-
-!
-[
-    {
-        { { 13 15 } { 15 13 } { 13 13 } }
-        { { 16 17 } { 16 13 } { 36 17 } { 36 13 } }
-        { { 16 1 } { 16 2 } { 36 1 } { 36 2 } }
-    }
-] [     0 >pv solid2 solid3  2array 
-        solid1 (solids-silhouette-subtract) 
-        [ corners>> ] map
-  ] unit-test
-
-
-[
-{
-    { { 8 13 } { 2 7 } { 12 9 } { 12 2 } }
-    { { 13 15 } { 15 13 } { 13 13 } }
-    { { 16 17 } { 16 15 } { 36 17 } { 36 15 } }
-    { { 16 1 } { 16 2 } { 36 1 } { 36 2 } }
-}
-] [ 
-    0 >pv  <space> solid1 suffix-solids 
-        solid2 suffix-solids 
-        solid3 suffix-solids
-     remove-hidden-solids
-    solids>> [ corners>> ] map
-] unit-test
-
-! { }
-! { }
-! <light> { 0.2 0.3 0.4 } >>color { 1 -1 1 } >>direction     suffix
-! <light> { 0.4 0.3 0.1 } >>color { -1 -1 -1 } >>direction   suffix
-! suffix 
-! { 0.1 0.1 0.1 } suffix ! ambient color
-! { 0.23 0.32 0.17 } suffix ! solid color
-! solid3 faces>> first 
-
-! enlight-projection
diff --git a/unmaintained/adsoda/adsoda.factor b/unmaintained/adsoda/adsoda.factor
deleted file mode 100755
index 01e437bc7d..0000000000
--- a/unmaintained/adsoda/adsoda.factor
+++ /dev/null
@@ -1,570 +0,0 @@
-! Copyright (C) 2008 Jeff Bigot
-! See http://factorcode.org/license.txt for BSD license.
-USING: accessors
-arrays 
-assocs
-combinators
-kernel 
-fry
-math 
-math.constants
-math.functions
-math.libm
-math.order
-math.vectors 
-math.matrices 
-math.parser
-namespaces
-prettyprint
-sequences
-sequences.deep
-sets
-slots
-sorting
-tools.time
-vars
-continuations
-words
-opengl
-opengl.gl
-colors
-adsoda.solution2
-adsoda.combinators
-opengl.demo-support
-values
-tools.walker
-;
-
-IN: adsoda
-
-DEFER: combinations
-VAR: pv
-
-
-! -------------------------------------------------------------
-! global values
-VALUE: remove-hidden-solids?
-VALUE: VERY-SMALL-NUM
-VALUE: ZERO-VALUE
-VALUE: MAX-FACE-PER-CORNER
-
-t to: remove-hidden-solids?
-0.0000001 to: VERY-SMALL-NUM
-0.0000001 to: ZERO-VALUE
-4 to: MAX-FACE-PER-CORNER
-! -------------------------------------------------------------
-! sequence complement
-
-: with-pv ( i quot -- ) [ swap >pv call ] with-scope  ; inline
-
-: dimension ( array -- x )      length 1- ; inline 
-: last ( seq -- x )           [ dimension ] [ nth ] bi ; inline
-: change-last ( seq quot -- ) 
-    [ [ dimension ] keep ] dip change-nth  ; 
-
-! -------------------------------------------------------------
-! light
-! -------------------------------------------------------------
-
-TUPLE: light name { direction array } color ;
-: <light> ( -- tuple ) light new ;
-
-! -------------------------------------------------------------
-! halfspace manipulation
-! -------------------------------------------------------------
-
-: constant+ ( v x -- w )  '[ [ _ + ] change-last ] keep ;
-: translate ( u v -- w )   dupd     v* sum     constant+ ; 
-
-: transform ( u matrix -- w )
-    [ swap m.v ] 2keep ! compute new normal vector    
-    [
-        [ [ abs ZERO-VALUE > ] find ] keep 
-        ! find a point on the frontier
-        ! be sure it's not null vector
-        last ! get constant
-        swap /f neg swap ! intercept value
-    ] dip  
-    flip 
-    nth
-    [ * ] with map ! apply intercep value
-    over v*
-    sum  neg
-    suffix ! add value as constant at the end of equation
-;
-
-: position-point ( halfspace v -- x ) 
-    -1 suffix v* sum  ; inline
-: point-inside-halfspace? ( halfspace v -- ? )       
-    position-point VERY-SMALL-NUM  > ; 
-: point-inside-or-on-halfspace? ( halfspace v -- ? ) 
-    position-point VERY-SMALL-NUM neg > ;
-: project-vector (  seq -- seq )     
-    pv> [ head ] [ 1+  tail ] 2bi append ; 
-: get-intersection ( matrice -- seq )     
-    [ 1 tail* ] map     flip first ;
-
-: islenght=? ( seq n -- seq n ? ) 2dup [ length ] [ = ] bi*  ;
-
-: compare-nleft-to-identity-matrix ( seq n -- ? ) 
-    [ [ head ] curry map ] keep  identity-matrix m- 
-    flatten
-    [ abs ZERO-VALUE < ] all?
-;
-
-: valid-solution? ( matrice n -- ? )
-    islenght=?
-    [ compare-nleft-to-identity-matrix ]  
-    [ 2drop f ] if ; inline
-
-: intersect-hyperplanes ( matrice -- seq )
-    [ solution dup ] [ first dimension ] bi
-    valid-solution?     [ get-intersection ] [ drop f ] if ;
-
-! -------------------------------------------------------------
-! faces
-! -------------------------------------------------------------
-
-TUPLE: face { halfspace array } 
-    touching-corners adjacent-faces ;
-: <face> ( v -- tuple )       face new swap >>halfspace ;
-: flip-face ( face -- face ) [ vneg ] change-halfspace ;
-: erase-face-touching-corners ( face -- face ) 
-    f >>touching-corners ;
-: erase-face-adjacent-faces ( face -- face )   
-    f >>adjacent-faces ;
-: faces-intersection ( faces -- v )  
-    [ halfspace>> ] map intersect-hyperplanes ;
-: face-translate ( face v -- face ) 
-    [ translate ] curry change-halfspace ; inline
-: face-transform ( face m -- face )
-    [ transform ] curry change-halfspace ; inline
-: face-orientation ( face -- x ) pv> swap halfspace>> nth sgn ;
-: backface? ( face -- face ? )      dup face-orientation 0 <= ;
-: pv-factor ( face -- f face )     
-    halfspace>> [ pv> swap nth [ * ] curry ] keep ; inline
-: suffix-touching-corner ( face corner -- face ) 
-    [ suffix ] curry   change-touching-corners ; inline
-: real-face? ( face -- ? )
-    [ touching-corners>> length ] 
-    [ halfspace>> dimension ] bi >= ;
-
-: (add-to-adjacent-faces) ( face face -- face )
-    over adjacent-faces>> 2dup member?
-    [ 2drop ] [ swap suffix >>adjacent-faces ] if ;
-
-: add-to-adjacent-faces ( face face -- face )
-    2dup =   [ drop ] [ (add-to-adjacent-faces) ] if ;
-
-: update-adjacent-faces ( faces corner -- )
-   '[ [ _ suffix-touching-corner drop ] each ] keep 
-    2 among [ 
-        [ first ] keep second  
-        [ add-to-adjacent-faces drop ] 2keep 
-        swap add-to-adjacent-faces drop  
-    ] each ; inline
-
-: face-project-dim ( face -- x )  halfspace>> length 2 -  ;
-
-: apply-light ( color light normal -- u )
-    over direction>>  v. 
-    neg dup 0 > 
-    [ 
-        [ color>> swap ] dip 
-        [ * ] curry map v+ 
-        [ 1 min ] map 
-    ] 
-    [ 2drop ] 
-    if
-;
-
-: enlight-projection ( array face -- color )
-    ! array = lights + ambient color
-    [ [ third ] [ second ] [ first ] tri ]
-    [ halfspace>> project-vector normalize ] bi*
-    [ apply-light ] curry each
-    v*
-;
-
-: (intersection-into-face) ( face-init face-adja quot -- face )
-    [
-    [  [ pv-factor ] bi@ 
-        roll 
-        [ map ] 2bi@
-        v-
-    ] 2keep
-    [ touching-corners>> ] bi@
-    [ swap  [ = ] curry find  nip f = ] curry find nip
-    ] dip  over
-     [
-        call
-        dupd
-        point-inside-halfspace? [ vneg ] unless 
-        <face> 
-     ] [ 3drop f ] if 
-    ; inline
-
-: intersection-into-face ( face-init face-adja -- face )
-    [ [ project-vector ] bi@ ]     (intersection-into-face) ;
-
-: intersection-into-silhouette-face ( face-init face-adja -- face )
-    [ ] (intersection-into-face) ;
-
-: intersections-into-faces ( face -- faces )
-    clone dup  
-    adjacent-faces>> [ intersection-into-face ] with map 
-    [ ] filter ;
-
-: (face-silhouette) ( face -- faces )
-    clone dup adjacent-faces>>
-    [   backface?
-        [ intersection-into-silhouette-face ] [ 2drop f ]  if  
-    ] with map 
-    [ ] filter
-; inline
-
-: face-silhouette ( face -- faces )     
-    backface? [ drop f ] [ (face-silhouette) ] if ;
-
-! --------------------------------
-! solid
-! -------------------------------------------------------------
-TUPLE: solid dimension silhouettes 
-    faces corners adjacencies-valid color name ;
-
-: <solid> ( -- tuple ) solid new ;
-
-: suffix-silhouettes ( solid silhouette -- solid )  
-    [ suffix ] curry change-silhouettes ;
-
-: suffix-face ( solid face -- solid )     
-    [ suffix ] curry change-faces ;
-: suffix-corner ( solid corner -- solid ) 
-    [ suffix ] curry change-corners ; 
-: erase-solid-corners ( solid -- solid )  f >>corners ;
-
-: erase-silhouettes ( solid -- solid ) 
-    dup dimension>> f <array> >>silhouettes ;
-: filter-real-faces ( solid -- solid ) 
-    [ [ real-face? ] filter ] change-faces ;
-: initiate-solid-from-face ( face -- solid ) 
-    face-project-dim  <solid> swap >>dimension ;
-
-: erase-old-adjacencies ( solid -- solid )
-    erase-solid-corners
-    [ dup [ erase-face-touching-corners 
-        erase-face-adjacent-faces drop ] each ]
-    change-faces ;
-
-: point-inside-or-on-face? ( face v -- ? ) 
-    [ halfspace>> ] dip point-inside-or-on-halfspace?  ;
-
-: point-inside-face? ( face v -- ? ) 
-    [ halfspace>> ] dip  point-inside-halfspace? ;
-
-: point-inside-solid? ( solid point -- ? )
-    [ faces>> ] dip [ point-inside-face? ] curry all? ; inline
-
-: point-inside-or-on-solid? ( solid point -- ? )
-    [ faces>> ] dip 
-    [ point-inside-or-on-face? ] curry  all?   ; inline
-
-: unvalid-adjacencies ( solid -- solid )  
-    erase-old-adjacencies f >>adjacencies-valid 
-    erase-silhouettes ;
-
-: add-face ( solid face -- solid ) 
-    suffix-face unvalid-adjacencies ; 
-
-: cut-solid ( solid halfspace -- solid )    <face> add-face ; 
-
-: slice-solid ( solid face  -- solid1 solid2 )
-    [ [ clone ] bi@ flip-face add-face 
-    [ "/outer/" append ] change-name  ] 2keep
-    add-face [ "/inner/" append ] change-name ;
-
-! -------------
-
-
-: add-silhouette ( solid  -- solid )
-   dup 
-   ! find-adjacencies 
-   faces>> { } 
-   [ face-silhouette append ] reduce
-   [ ] filter 
-   <solid> 
-        swap >>faces
-        over dimension>> >>dimension 
-        over name>> " silhouette " append 
-                 pv> number>string append 
-        >>name
-     !   ensure-adjacencies
-   suffix-silhouettes ; inline
-
-: find-silhouettes ( solid -- solid )
-    { } >>silhouettes 
-    dup dimension>> [ [ add-silhouette ] with-pv ] each ;
-
-: ensure-silhouettes ( solid  -- solid )
-    dup  silhouettes>>  [ f = ] all?
-    [ find-silhouettes  ]  when ; 
-
-! ------------
-
-: corner-added? ( solid corner -- ? ) 
-    ! add corner to solid if it is inside solid
-    [ ] 
-    [ point-inside-or-on-solid? ] 
-    [ swap corners>> member? not ] 
-    2tri and
-    [ suffix-corner drop t ] [ 2drop f ] if ;
-
-: process-corner ( solid faces corner -- )
-    swapd 
-    [ corner-added? ] keep swap ! test if corner is inside solid
-    [ update-adjacent-faces ] 
-    [ 2drop ]
-    if ;
-
-: compute-intersection ( solid faces -- )
-    dup faces-intersection
-    dup f = [ 3drop ] [ process-corner ]  if ;
-
-: test-faces-combinaisons ( solid n -- )
-    [ dup faces>> ] dip among   
-    [ compute-intersection ] with each ;
-
-: compute-adjacencies ( solid -- solid )
-    dup dimension>> [ >= ] curry 
-    [ keep swap ] curry MAX-FACE-PER-CORNER swap
-    [ [ test-faces-combinaisons ] 2keep 1- ] [ ] while drop ;
-
-: find-adjacencies ( solid -- solid ) 
-    erase-old-adjacencies   
-    compute-adjacencies
-    filter-real-faces 
-    t >>adjacencies-valid ;
-
-: ensure-adjacencies ( solid -- solid ) 
-    dup adjacencies-valid>> 
-    [ find-adjacencies ] unless 
-    ensure-silhouettes
-    ;
-
-: (non-empty-solid?) ( solid -- ? ) 
-    [ dimension>> ] [ corners>> length ] bi < ;
-: non-empty-solid? ( solid -- ? )   
-    ensure-adjacencies (non-empty-solid?) ;
-
-: compare-corners-roughly ( corner corner -- ? )
-    2drop t ;
-! : remove-inner-faces ( -- ) ;
-: face-project ( array face -- seq )
-    backface? 
-  [ 2drop f ]
-    [   [ enlight-projection ] 
-        [ initiate-solid-from-face ]
-        [ intersections-into-faces ]  tri
-        >>faces
-        swap >>color        
-    ]    if ;
-
-: solid-project ( lights ambient solid -- solids )
-  ensure-adjacencies
-    [ color>> ] [ faces>> ] bi [ 3array  ] dip
-    [ face-project ] with map 
-    [ ] filter 
-    [ ensure-adjacencies ] map
-;
-
-: (solid-move) ( solid v move -- solid ) 
-   curry [ map ] curry 
-   [ dup faces>> ] dip call drop  
-   unvalid-adjacencies ; inline
-
-: solid-translate ( solid v -- solid ) 
-    [ face-translate ] (solid-move) ; 
-: solid-transform ( solid m -- solid ) 
-    [ face-transform ] (solid-move) ; 
-
-: find-corner-in-silhouette ( s1 s2 -- elt bool )
-    pv> swap silhouettes>> nth     
-    swap corners>>
-    [ point-inside-solid? ] with find swap ;
-
-: valid-face-for-order ( solid point -- face )
-    [ point-inside-face? not ] 
-    [ drop face-orientation  0 = not ] 2bi and ;
-
-: check-orientation ( s1 s2 pt -- int )
-    [ nip faces>> ] dip
-    [ valid-face-for-order ] curry find swap
-    [ face-orientation ] [ drop f ] if ;
-
-: (order-solid) ( s1 s2 -- int )
-    2dup find-corner-in-silhouette
-    [ check-orientation ] [ 3drop f ] if ;
-
-: order-solid ( solid solid  -- i ) 
-    2dup (order-solid)
-    [ 2nip ]
-    [   swap (order-solid)
-        [ neg ] [ f ] if*
-    ] if* ;
-
-: subtract ( solid1 solid2 -- solids )
-    faces>> swap clone ensure-adjacencies ensure-silhouettes  
-    [ swap slice-solid drop ]  curry map
-    [ non-empty-solid? ] filter
-    [ ensure-adjacencies ] map
-; inline
-
-! -------------------------------------------------------------
-! space 
-! -------------------------------------------------------------
-TUPLE: space name dimension solids ambient-color lights ;
-: <space> ( -- space )      space new ;
-: suffix-solids ( space solid -- space ) 
-    [ suffix ] curry change-solids ; inline
-: suffix-lights ( space light -- space ) 
-    [ suffix ] curry change-lights ; inline
-: clear-space-solids ( space -- space )     f >>solids ;
-
-: space-ensure-solids ( space -- space ) 
-    [ [ ensure-adjacencies ] map ] change-solids ;
-: eliminate-empty-solids ( space -- space ) 
-    [ [ non-empty-solid? ] filter ] change-solids ;
-
-: projected-space ( space solids -- space ) 
-   swap dimension>> 1-  <space>    
-   swap >>dimension    swap  >>solids ;
-
-: get-silhouette ( solid -- silhouette )    
-    silhouettes>> pv> swap nth ;
-: solid= ( solid solid -- ? )            [ corners>> ]  bi@ = ;
-
-: space-apply ( space m quot -- space ) 
-        curry [ map ] curry [ dup solids>> ] dip
-        [ call ] [ drop ] recover drop ;
-: space-transform ( space m -- space ) 
-    [ solid-transform ] space-apply ;
-: space-translate ( space v -- space ) 
-    [ solid-translate ] space-apply ; 
-
-: describe-space ( space -- ) 
-    solids>>  
-    [  [ corners>>  [ pprint ] each ] [ name>> . ] bi ] each ;
-
-: clip-solid ( solid solid -- solids )
-    [ ]
-    [ solid= not ]
-    [ order-solid -1 = ] 2tri 
-    and
-    [ get-silhouette subtract ] 
-    [  drop 1array ] 
-    if 
-    
-    ;
-
-: (solids-silhouette-subtract) ( solids solid -- solids ) 
-     [  clip-solid append ] curry { } -rot each ; inline
-
-: solids-silhouette-subtract ( solids i solid -- solids )
-! solids is an array of 1 solid arrays
-      [ (solids-silhouette-subtract) ] curry map-but 
-; inline 
-
-: remove-hidden-solids ( space -- space ) 
-! We must include each solid in a sequence because 
-! during substration 
-! a solid can be divided in more than on solid
-    [ 
-        [ [ 1array ] map ] 
-        [ length ] 
-        [ ] 
-        tri     
-        [ solids-silhouette-subtract ] 2each
-        { } [ append ] reduce 
-    ] change-solids
-    eliminate-empty-solids ! TODO include into change-solids
-;
-
-: space-project ( space i -- space )
-  [
-  [ clone  
-    remove-hidden-solids? [ remove-hidden-solids ] when
-    dup 
-        [ solids>> ] 
-        [ lights>> ] 
-        [ ambient-color>> ]  tri 
-        [ rot solid-project ] 2curry 
-        map 
-        [ append ] { } -rot each 
-        ! TODO project lights
-        projected-space 
-      ! remove-inner-faces 
-      ! 
-      eliminate-empty-solids
-    ] with-pv 
-    ] [ 3drop <space> ] recover
-    ; inline
-
-: middle-of-space ( space -- point )
-    solids>> [ corners>> ] map concat
-    [ [ ] [ v+ ] map-reduce ] [ length ] bi v/n
-;
-
-! -------------------------------------------------------------
-! 3D rendering
-! -------------------------------------------------------------
-
-: face-reference ( face -- halfspace point vect )
-       [ halfspace>> ] 
-       [ touching-corners>> first ] 
-       [ touching-corners>> second ] tri 
-       over v-
-;
-
-: theta ( v halfspace point vect -- v x )
-   [ [ over ] dip v- ] dip    
-   [ cross dup norm >float ]
-   [ v. >float ]  
-   2bi 
-   fatan2
-   -rot v. 
-   0 < [ neg ] when
-;
-
-: ordered-face-points ( face -- corners )  
-    [ touching-corners>> 1 head ] 
-    [ touching-corners>> 1 tail ] 
-    [ face-reference [ theta ] 3curry ]         tri
-    { } map>assoc    sort-values keys 
-    append
-    ; inline
-
-: point->GL  ( point -- )   gl-vertex ;
-: points->GL ( array -- )   do-cycle [ point->GL ] each ;
-
-: face->GL ( face color -- )
-   [ ordered-face-points ] dip
-   [ first3 1.0 glColor4d GL_POLYGON 
-        [ [ point->GL  ] each ] do-state ] curry
-   [  0 0 0 1 glColor4d GL_LINE_LOOP 
-        [ [ point->GL  ] each ] do-state ]
-   bi
-   ; inline
-
-: solid->GL ( solid -- )    
-    [ faces>> ]    
-    [ color>> ] bi
-    [ face->GL ] curry each ; inline
-
-: space->GL ( space -- )
-    solids>>
-    [ solid->GL ] each ;
-
-
-
-
-
diff --git a/unmaintained/adsoda/adsoda.tests b/unmaintained/adsoda/adsoda.tests
deleted file mode 100755
index f0b0c54953..0000000000
--- a/unmaintained/adsoda/adsoda.tests
+++ /dev/null
@@ -1,147 +0,0 @@
-! : init-4D-demo ( -- space )
-! OK
-! espace de dimension 4 et de couleur 0,3 0.3 0.3
-<space> 
-    4 >>dimension
-    { 0.3 0.3 0.3 } >>ambient-color
-    { 100 150 100  150 100 150 100 150 } "4cube1" 4cube suffix-solids
-   { 160 180  160 180 160 180 160 180 } "4cube2" 4cube suffix-solids
-    <light>
-        { -100 -100 -100 -100 } >>position
-        { 0.2 0.7 0.1 } >>color
-        suffix-lights
-! ;
-! : init-3D-demo ( -- space )
-! OK
-! espace de dimension 4 et de couleur 0,3 0.3 0.3
-<space> 
-    3 >>dimension
-    { 0.3 0.3 0.3 } >>ambient-color
-    { 100 150 100  150 100 150 } "3cube1" 3cube suffix-solids
-  !  { -150 -10  -150 -10 -150 -10 -150 -10 } "4cube2" 4cube suffix-solids
-    <light>
-        { -100 -100 -100 -100 } >>position
-        { 0.2 0.7 0.1 } >>color
-        suffix-lights
-! ;
-
-
-: s1 ( -- solid )
-    <solid> 
-    2 >>dimension
-    "s1" >>name
-    { 1 1 1 } >>color
-    { 1 -1 -5 } cut-solid 
-    { -1 -1 -21 } cut-solid 
-    { -1 0 -12 } cut-solid 
-    { 1 2 16 } cut-solid
-;
-: solid1 ( -- solid )
-    <solid> 
-    2 >>dimension
-    "solid1" >>name
-    { 1 -1 -5 } cut-solid 
-    { -1 -1 -21 } cut-solid 
-    { -1 0 -12 } cut-solid 
-    { 1 2 16 } cut-solid
-    ensure-adjacencies
-    
-;
-: solid2 ( -- solid )
-    <solid> 
-    2 >>dimension
-    "solid2" >>name
-    { -1 1 -10 } cut-solid 
-    { -1 -1 -28 } cut-solid 
-    { 1 0 13 } cut-solid 
- !   { 1 2 16 } cut-solid
-    ensure-adjacencies
-    
-;
-
-: solid3 ( -- solid )
-      <solid> 
-    2 >>dimension
-    "solid3" >>name
-    { 1 1 1 } >>color
-    { 1 0 16 } cut-solid 
-    { -1 0 -36 } cut-solid 
-    { 0 1 1 } cut-solid 
-    { 0 -1  -17 } cut-solid 
- !   { 1 2 16 } cut-solid
-    ensure-adjacencies
-    
-
-;
-
-: solid4 ( -- solid )
-      <solid> 
-    2 >>dimension
-    "solid4" >>name
-    { 1 1 1 } >>color
-    { 1 0 21 } cut-solid 
-    { -1 0 -36 } cut-solid 
-    { 0 1 1 } cut-solid 
-    { 0 -1  -17 } cut-solid 
-    ensure-adjacencies
-    
-;
-
-: solid5 ( -- solid )
-      <solid> 
-    2 >>dimension
-    "solid5" >>name
-    { 1 1 1 } >>color
-    { 1 0 6 } cut-solid 
-    { -1 0 -17 } cut-solid 
-    { 0 1 17 } cut-solid 
-    { 0 -1  -19 } cut-solid 
-    ensure-adjacencies
-    
-;
-
-: solid7 ( -- solid )
-      <solid> 
-    2 >>dimension
-    "solid7" >>name
-    { 1 1 1 } >>color
-    { 1 0 38 } cut-solid 
-    { 1 -5 -66 } cut-solid 
-    { -2 1 -75 } cut-solid
-    ensure-adjacencies
-    
-;
-
-: solid6s ( -- seq )
-  solid3 clone solid2 clone subtract
-;
-
-: space1 ( -- space )
-    <space>
-        2 >>dimension
-     !    solid3 suffix-solids
-        solid1 suffix-solids
-        solid2 suffix-solids
-    !   solid6s [ suffix-solids ] each 
-        solid4 suffix-solids
-     !   solid5 suffix-solids
-        solid7 suffix-solids
-        { 1 1 1 } >>ambient-color
-            <light>
-        { -100 -100 } >>position
-        { 0.2 0.7 0.1 } >>color
-        suffix-lights
-;
-
-: space2 ( -- space )
-    <space>
-        4 >>dimension
-       ! 4cube suffix-solids
-        { 1 1 1 } >>ambient-color
-            <light>
-        { -100 -100 } >>position
-        { 0.2 0.7 0.1 } >>color
-        suffix-lights
-
-       ;
-
diff --git a/unmaintained/adsoda/authors.txt b/unmaintained/adsoda/authors.txt
deleted file mode 100755
index 856f3b05fc..0000000000
--- a/unmaintained/adsoda/authors.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-Jeff Bigot
-Greg Ferrar
\ No newline at end of file
diff --git a/unmaintained/adsoda/combinators/authors.txt b/unmaintained/adsoda/combinators/authors.txt
deleted file mode 100755
index e7f4cdeb7c..0000000000
--- a/unmaintained/adsoda/combinators/authors.txt
+++ /dev/null
@@ -1 +0,0 @@
-JF Bigot, after Greg Ferrar
\ No newline at end of file
diff --git a/unmaintained/adsoda/combinators/combinators-docs.factor b/unmaintained/adsoda/combinators/combinators-docs.factor
deleted file mode 100755
index 0121dce32b..0000000000
--- a/unmaintained/adsoda/combinators/combinators-docs.factor
+++ /dev/null
@@ -1,39 +0,0 @@
-! Copyright (C) 2008 Your name.
-! See http://factorcode.org/license.txt for BSD license.
-USING: arrays help.markup help.syntax kernel sequences ;
-IN: adsoda.combinators
-
-HELP: among
-{ $values
-     { "array" array } { "n" "number of value to select" }
-     { "array" array }
-}
-{ $description "returns an array containings every possibilities of n choices among a given sequence" } ;
-
-HELP: columnize
-{ $values
-     { "array" array }
-     { "array" array }
-}
-{ $description "flip a sequence into a sequence of 1 element sequences" } ;
-
-HELP: concat-nth
-{ $values
-     { "seq1" sequence } { "seq2" sequence }
-     { "seq" sequence }
-}
-{ $description "merges 2 sequences of sequences appending corresponding elements" } ;
-
-HELP: do-cycle
-{ $values
-     { "array" array }
-     { "array" array }
-}
-{ $description "Copy the first element at the end of the sequence in order to close the cycle." } ;
-
-
-ARTICLE: "adsoda.combinators" "Combinators"
-{ $vocab-link "adsoda.combinators" }
-;
-
-ABOUT: "adsoda.combinators"
diff --git a/unmaintained/adsoda/combinators/combinators-tests.factor b/unmaintained/adsoda/combinators/combinators-tests.factor
deleted file mode 100755
index 6796929a74..0000000000
--- a/unmaintained/adsoda/combinators/combinators-tests.factor
+++ /dev/null
@@ -1,11 +0,0 @@
-USING: adsoda.combinators
-sequences
-    tools.test 
- ;
-
-IN: adsoda.combinators.tests
-
-
-[ { "atoto" "b" "ctoto" } ] [ { "a" "b" "c" } 1 [ "toto" append ] map-but ] 
-    unit-test
-
diff --git a/unmaintained/adsoda/combinators/combinators.factor b/unmaintained/adsoda/combinators/combinators.factor
deleted file mode 100755
index 4e4bbff72d..0000000000
--- a/unmaintained/adsoda/combinators/combinators.factor
+++ /dev/null
@@ -1,45 +0,0 @@
-! Copyright (C) 2008 Jeff Bigot
-! See http://factorcode.org/license.txt for BSD license.
-USING: kernel arrays sequences fry math combinators ;
-
-IN: adsoda.combinators
-
-! : (combinations) ( seq -- seq ) [ 1 tail ] dip combinations ;
-
-! : prefix-each [ prefix ] curry map ; inline
-
-! : combinations ( seq n -- seqs )
-!    {
-!        { [ dup 0 = ] [ 2drop { { } } ] }
-!        { [ over empty? ] [ 2drop { } ] }
-!        { [ t ] [ 
-!            [ [ 1- (combinations) ] [ drop first ] 2bi prefix-each ]
-!            [ (combinations) ] 2bi append
-!        ] }
-!    } cond ;
-
-: columnize ( array -- array ) [ 1array ] map ; inline
-
-: among ( array n -- array )
-    2dup swap length 
-    {
-        { [ over 1 = ] [ 3drop columnize ] }
-        { [ over 0 = ] [ 2drop 2drop { } ] }
-        { [ 2dup < ] [ 2drop [ 1 cut ] dip  
-                         [ 1- among [ append ] with map  ] 
-                         [ among append ] 2bi
-                       ] }
-        { [ 2dup = ] [ 3drop 1array ] }
-        { [ 2dup > ] [ 2drop 2drop {  } ] } 
-    } cond
-;
-
-: concat-nth ( seq1 seq2 -- seq )  
-    [ nth append ] curry map-index ;
-
-: do-cycle   ( array -- array )   dup first suffix ;
-
-: map-but ( seq i quot -- seq )
-    ! quot : ( seq x -- seq )
-    '[ _ = [ @ ] unless ] map-index ; inline
-
diff --git a/unmaintained/adsoda/solution2/solution2.factor b/unmaintained/adsoda/solution2/solution2.factor
deleted file mode 100755
index 3e0648128d..0000000000
--- a/unmaintained/adsoda/solution2/solution2.factor
+++ /dev/null
@@ -1,126 +0,0 @@
-USING: kernel
-sequences
-namespaces
-
-math
-math.vectors
-math.matrices
-;
-IN: adsoda.solution2
-
-! -------------------
-! correctif solution
-! ---------------
-SYMBOL: matrix
-: MIN-VAL-adsoda ( -- x ) 0.00000001
-! 0.000000000001 
-;
-
-: zero? ( x -- ? ) 
-    abs MIN-VAL-adsoda <
-;
-
-! [ number>string string>number ] map 
-
-: with-matrix ( matrix quot -- )
-    [ swap matrix set call matrix get ] with-scope ; inline
-
-: nth-row ( row# -- seq ) matrix get nth ;
-
-: change-row ( row# quot -- seq ) ! row# quot -- | quot: seq -- seq )
-    matrix get swap change-nth ; inline
-
-: exchange-rows ( row# row# -- ) matrix get exchange ;
-
-: rows ( -- n ) matrix get length ;
-
-: cols ( -- n ) 0 nth-row length ;
-
-: skip ( i seq quot -- n )
-    over [ find-from drop ] dip length or ; inline
-
-: first-col ( row# -- n )
-    #! First non-zero column
-    0 swap nth-row [ zero? not ] skip ;
-
-: clear-scale ( col# pivot-row i-row -- n )
-    [ over ] dip nth dup zero? [
-        3drop 0
-    ] [
-        [ nth dup zero? ] dip swap [
-            2drop 0
-        ] [
-            swap / neg
-        ] if
-    ] if ;
-
-: (clear-col) ( col# pivot-row i -- )
-    [ [ clear-scale ] 2keep [ n*v ] dip v+ ] change-row ;
-
-: rows-from ( row# -- slice )
-    rows dup <slice> ;
-
-: clear-col ( col# row# rows -- )
-    [ nth-row ] dip [ [ 2dup ] dip (clear-col) ] each 2drop ;
-
-: do-row ( exchange-with row# -- )
-    [ exchange-rows ] keep
-    [ first-col ] keep
-    dup 1+ rows-from clear-col ;
-
-: find-row ( row# quot -- i elt )
-    [ rows-from ] dip find ; inline
-
-: pivot-row ( col# row# -- n )
-    [ dupd nth-row nth zero? not ] find-row 2nip ;
-
-: (echelon) ( col# row# -- )
-    over cols < over rows < and [
-        2dup pivot-row [ over do-row 1+ ] when*
-        [ 1+ ] dip (echelon)
-    ] [
-        2drop
-    ] if ;
-
-: echelon ( matrix -- matrix' )
-    [ 0 0 (echelon) ] with-matrix ;
-
-: nonzero-rows ( matrix -- matrix' )
-    [ [ zero? ] all? not ] filter ;
-
-: null/rank ( matrix -- null rank )
-    echelon dup length swap nonzero-rows length [ - ] keep ;
-
-: leading ( seq -- n elt ) [ zero? not ] find ;
-
-: reduced ( matrix' -- matrix'' )
-    [
-        rows <reversed> [
-            dup nth-row leading drop
-            dup [ swap dup clear-col ] [ 2drop ] if
-        ] each
-    ] with-matrix ;
-
-: basis-vector ( row col# -- )
-    [ clone ] dip
-    [ swap nth neg recip ] 2keep
-    [ 0 spin set-nth ] 2keep
-    [ n*v ] dip
-    matrix get set-nth ;
-
-: nullspace ( matrix -- seq )
-    echelon reduced dup empty? [
-        dup first length identity-matrix [
-            [
-                dup leading drop
-                dup [ basis-vector ] [ 2drop ] if
-            ] each
-        ] with-matrix flip nonzero-rows
-    ] unless ;
-
-: 1-pivots ( matrix -- matrix )
-    [ dup leading nip [ recip v*n ] when* ] map ;
-
-: solution ( matrix -- matrix )
-    echelon nonzero-rows reduced 1-pivots ;
-
diff --git a/unmaintained/adsoda/solution2/summary.txt b/unmaintained/adsoda/solution2/summary.txt
deleted file mode 100755
index a25a451f3c..0000000000
--- a/unmaintained/adsoda/solution2/summary.txt
+++ /dev/null
@@ -1 +0,0 @@
-A modification of solution to approximate solutions
\ No newline at end of file
diff --git a/unmaintained/adsoda/summary.txt b/unmaintained/adsoda/summary.txt
deleted file mode 100755
index ee666bc787..0000000000
--- a/unmaintained/adsoda/summary.txt
+++ /dev/null
@@ -1 +0,0 @@
-ADSODA : Arbitrary-Dimensional Solid Object Display Algorithm
\ No newline at end of file
diff --git a/unmaintained/adsoda/tags.txt b/unmaintained/adsoda/tags.txt
deleted file mode 100755
index 6e25b2f44b..0000000000
--- a/unmaintained/adsoda/tags.txt
+++ /dev/null
@@ -1 +0,0 @@
-adsoda 4D viewer
\ No newline at end of file
diff --git a/unmaintained/adsoda/tools/authors.txt b/unmaintained/adsoda/tools/authors.txt
deleted file mode 100755
index a6a96933f4..0000000000
--- a/unmaintained/adsoda/tools/authors.txt
+++ /dev/null
@@ -1 +0,0 @@
-Jeff Bigot
\ No newline at end of file
diff --git a/unmaintained/adsoda/tools/tools-docs.factor b/unmaintained/adsoda/tools/tools-docs.factor
deleted file mode 100755
index 1d952e329b..0000000000
--- a/unmaintained/adsoda/tools/tools-docs.factor
+++ /dev/null
@@ -1,62 +0,0 @@
-! Copyright (C) 2008 Jeff Bigot.
-! See http://factorcode.org/license.txt for BSD license.
-USING: arrays help.markup help.syntax kernel sequences ;
-IN: adsoda.tools
-
-HELP: 3cube
-{ $values 
-    { "array" "array" } { "name" "name" } 
-    { "solid" "solid" } 
-}
-{ $description "array : xmin xmax ymin ymax zmin zmax" 
-"returns a 3D solid with given limits"
-} ;
-
-HELP: 4cube
-{ $values 
-    { "array" "array" } { "name" "name" } 
-    { "solid" "solid" } 
-}
-{ $description "array : xmin xmax ymin ymax zmin zmax wmin wmax"  
-"returns a 4D solid with given limits"
-} ;
-
-
-HELP: equation-system-for-normal
-{ $values
-     { "points" "a list of n points" }
-     { "matrix" "matrix" }
-}
-{ $description "From a list of points, return the matrix" 
-"to solve in order to find the vector normal to the plan defined by the points" } 
-;
-
-HELP: normal-vector
-{ $values
-     { "points" "a list of n points" }
-     { "v" "a vector" }
-}
-{ $description "From a list of points, returns the vector normal to the plan defined by the points" 
-"With n points, creates n-1 vectors and then find a vector orthogonal to every others"
-"returns { f } if a normal vector can not be found" } 
-;
-
-HELP: points-to-hyperplane
-{ $values
-     { "points" "a list of n points" }
-     { "hyperplane" "an hyperplane equation" }
-}
-{ $description "From a list of points, returns the equation of the hyperplan"
-"Finds a normal vector and then translate it so that it includes one of the points"
-
-} 
-;
-
-ARTICLE: "adsoda.tools" "Tools"
-{ $vocab-link "adsoda.tools" }
-"Tools to help in building an " { $vocab-link "adsoda" } "-space"
-;
-
-ABOUT: "adsoda.tools"
-
-
diff --git a/unmaintained/adsoda/tools/tools-tests.factor b/unmaintained/adsoda/tools/tools-tests.factor
deleted file mode 100755
index bb5419417c..0000000000
--- a/unmaintained/adsoda/tools/tools-tests.factor
+++ /dev/null
@@ -1,14 +0,0 @@
-! Copyright (C) 2008 Jeff Bigot
-! See http://factorcode.org/license.txt for BSD license.
-USING: 
-adsoda.tools
-tools.test
-;
-
-IN: adsoda.tools.tests
-
-
- [ { 1 0 } ] [ { { 0 0 } { 0 1 } }  normal-vector    ] unit-test
- [ f ] [ { { 0 0 } { 0 0 } }  normal-vector    ] unit-test
-
- [  { 1/2 1/2 1+1/2 }  ] [ { { 1 2 } { 2 1 } }  points-to-hyperplane ] unit-test
diff --git a/unmaintained/adsoda/tools/tools.factor b/unmaintained/adsoda/tools/tools.factor
deleted file mode 100755
index 6c4f4c3029..0000000000
--- a/unmaintained/adsoda/tools/tools.factor
+++ /dev/null
@@ -1,150 +0,0 @@
-! Copyright (C) 2008 Jeff Bigot
-! See http://factorcode.org/license.txt for BSD license.
-USING: 
-kernel
-sequences
-math
-accessors
-adsoda
-math.vectors 
-math.matrices
-bunny.model
-io.encodings.ascii
-io.files
-sequences.deep
-combinators
-adsoda.combinators
-fry
-io.files.temp
-grouping
-;
-
-IN: adsoda.tools
-
-
-
-
-
-! ---------------------------------
-: coord-min ( x array -- array )  swap suffix  ;
-: coord-max ( x array -- array )  swap neg suffix ;
-
-: 4cube ( array name -- solid )
-! array : xmin xmax ymin ymax zmin zmax wmin wmax
-    <solid> 
-    4 >>dimension
-    swap >>name
-    swap
-    { 
-       [ { 1 0 0 0 } coord-min ] [ { -1 0 0 0 } coord-max ] 
-       [ { 0 1 0 0 } coord-min ] [ { 0 -1 0 0 } coord-max ]
-       [ { 0 0 1 0 } coord-min ] [ { 0 0 -1 0 } coord-max ] 
-       [ { 0 0 0 1 } coord-min ] [ { 0 0 0 -1 } coord-max ]
-    }
-    [ curry call ] 2map 
-    [ cut-solid ] each 
-    ensure-adjacencies
-    
-; inline
-
-: 3cube ( array name -- solid )
-! array : xmin xmax ymin ymax zmin zmax wmin wmax
-    <solid> 
-    3 >>dimension
-    swap >>name
-    swap
-    { 
-       [ { 1 0 0 } coord-min ] [ { -1 0 0 } coord-max ] 
-       [ { 0 1 0 } coord-min ] [ { 0 -1 0 } coord-max ]
-       [ { 0 0 1 } coord-min ] [ { 0 0 -1 } coord-max ] 
-    }
-    [ curry call ] 2map 
-    [ cut-solid ] each 
-    ensure-adjacencies
-    
-; inline
-
-
-: equation-system-for-normal ( points -- matrix )
-    unclip [ v- 0 suffix ] curry map
-    dup first [ drop 1 ] map     suffix
-;
-
-: normal-vector ( points -- v ) 
-    equation-system-for-normal
-    intersect-hyperplanes ;
-
-: points-to-hyperplane ( points -- hyperplane )
-    [ normal-vector 0 suffix ] [ first ] bi
-    translate ;
-
-: refs-to-points ( points faces -- faces )
-   [ swap [ nth 10 v*n { 100 100 100 } v+ ] curry map ] 
-   with map
-;
-! V{ { 0.1 0.2 } { 1.1 1.3 } } V{ { 1 0 } { 0 1 } }
-! V{ { { 1.1 1.3 } { 0.1 0.2 } } { { 0.1 0.2 } { 1.1 1.3 } } }
-
-: ply-model-path ( -- path )
-
-! "bun_zipper.ply" 
-"screw2.ply"
-temp-file 
-;
-
-: read-bunny-model ( -- v )
-ply-model-path ascii [  parse-model ] with-file-reader
-
-refs-to-points
-;
-
-: 3points-to-normal ( seq -- v )
-    unclip [ v- ] curry map first2 cross normalize
-;
-: 2-faces-to-prism ( seq seq -- seq )
-  2dup
-    [ do-cycle 2 clump ] bi@ concat-nth  
-    !  3 faces rectangulaires
-    swap prefix
-    swap prefix
-;    
-
-: Xpoints-to-prisme ( seq height -- cube )
-    ! from 3 points gives a list of faces representing 
-    ! a cube of height "height"
-    ! and of based on the three points
-    ! a face is a group of 3 or mode points.   
-    [ dup dup  3points-to-normal ] dip 
-    v*n [ v+ ] curry map ! 2 eme face triangulaire 
-    2-faces-to-prism  
-
-! [ dup number? [ 1 + ] when ] deep-map
-! dup keep 
-;
-
-
-: Xpoints-to-plane4D ( seq x y -- 4Dplane )
-    ! from 3 points gives a list of faces representing 
-    ! a cube in 4th dim
-    ! from x to y (height = y-x)
-    ! and of based on the X points
-    ! a face is a group of 3 or mode points.   
-    '[ [ [ _ suffix ] map ] [ [ _ suffix ] map ] bi ] call
-    2-faces-to-prism
-;
-
-: 3pointsfaces-to-3Dsolidfaces ( seq -- seq )
-    [ 1 Xpoints-to-prisme [ 100 
-        110 Xpoints-to-plane4D ] map concat ] map 
-
-;
-
-: test-figure ( -- solid )
-    <solid> 
-    2 >>dimension
-    { 1 -1 -5 } cut-solid 
-    { -1 -1 -21 } cut-solid 
-    { -1 0 -12 } cut-solid 
-    { 1 2 16 } cut-solid
-;
-