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+
+BUGS
+----
+o Some invalid DXF data gets pass the import checks and breaks the tessing code
+o Broken polyhedron() entities are not correctly detected and cause CGAL segfaults
+o Tesselation via GLU sometimes produces strange results
+o Non-manifold objects make CGAL crash (e.g. two cubes which touch at one edge)
+o Export STL: Exports existing CGAL model even though the current model is changed, but not CGAL rendered
+
+USER INTERFACE
+--------------
+o Preferences
+  - Beautify color schemes
+  - Color schemes read from file
+  - Color scheme editor
+  - wireframe width
+  - pointsize
+  - OpenGL params
+  - Default language feature settings
+  - Auto-view CSG/thrown together on load
+o Export etc.: automatically add missing extension as in SaveAs
+o MDI
+  - Think about how to do MDI the right way
+  - Ctrl-W should close the current dialog, not the current main window
+    -> implement as for Preferences?
+  - Menu bar handling:
+    Mac: share menubar among all top-level windows?
+o 3D View
+  - Improve mouse rotation
+  - Add modifier key combos to handle pan on 1 mouse button systems
+  - Show grid
+  - 4 x split view w/orthogonal cameras?
+  - Quick highlighting of object under the cursor in the editor
+  - View All
+  - overlay indicator displaying current view mode
+o Editor
+  - Autocompletion/hints for builtin (and user-defined) functions/modules
+  - builtin quick function reference/help
+  - Drawer/popup with all modules/functions listed which can be inserted into
+    the editor by clicking or drag&drop -> icons in toolbar?
+    -> This would be moving in the direction of a traditional CAD GUI
+       and needs a fair bit of thinking.
+  - More infrastructur for external editor (or is the reload good enough?)
+  - Evaluate QCodeEdit (http://qcodeedit.edyuk.org)
+  - Display some kind of line wrap indicator
+  - Couple the source code to the AST to allow highlighting selected elements
+    in the source code in the 3D view
+o Misc
+  - Reload and compile: Ask for confirmation if file is locally edited
+    (make this configurable in preferences?)
+  - Save: Ask for confirmation if file has been externaly changed
+  - Rename OpenCSG and CGAL to smth. not specific to the underlying libraries
+    (e.g Preview, Render)
+
+ENGINE
+------
+o Primitives
+  - Springs, spirals (requested by Cathal Garvey)
+  - (TTF) Text
+o 2D Subsystem
+  - Add generic 3D->2D projection statements
+  - 2D->3D using clipping plane
+  - Performance: Is it necessary to union children before extrusion
+    when compiling? Can this be postponed to CGAL evaluation time?
+o Built-in modules
+  - extrude*: Allow the base 2D primitive to have a Z value
+o Advanced Transformations
+  - Add statement for 2D and 3D minkowski sum
+  - Add statement for refinement via surface subdivision
+  - Add statement for intersections in cartesian product of childs
+o Function-Module-Interface
+  - Pass a module instanciation to a function (e.g. for a volume() function)
+  - Pass a function to a module instanciation (e.g. for dynamic extrusion paths)
+o Language Frontend
+  - Allow local variables and functions everywhere (not only on module level)
+o DXF Import
+  - Support for POLYLINE entity
+  - Support for SPLINE entity
+  - Support for LEADER entity
+  - Support for MTEXT entity ?
+  - idea: DXF inline - convert from dxf to OpenSCAD syntax -> parametrize dxf content
+o Mesh optimization on STL export
+  - Remove super small triangles (all sides are short)
+  - Replace super thin triangles (one h is short)
+o Misc
+  - Add symbolic colors to the color() statement
+  - Go through default values of parameters (e.g. cube() has x,y,z=1 while linear_extrude() has height=100)
+o Grammar
+  - dim->name -> dim->label
+  - A random(seed) function
+  - import_*() -> *_import() (consistent prefix vs. postfix)
+  - linear_extrude()/rotate_extrude(): Cumbersome names? -> (extrude, revolve, lathe, sweep ?) 
+
+CODE
+----
+
+o Refactor from MainWindow:
+  - Fix current_win hack
+  - CSG data structure (compiled model)
+  - CGAL data structure (compiled model)
+o C++-ify
+  - Use smart pointers where it makes sense (e.g. instead of homegrown refcount,
+    and to get memory ownership under control)
+  - Use static_cast instead of C-style casts
+o dxflinextrude and dxfrotextrude could share code
+o Consider decoupling DXF-specific functionality from the 2D subsystem
+o Make the interfaces from OpenSCAD and OpenCSG and CGAL cleaner to facilitate
+  experimentation with other frameworks (ref. Nef_polyhedron_2() problems)
+
+INFRASTRUCTURE
+--------------
+o Think about making external libraries easier available. Probably mostly convenience.
+o Use a logging framework to get debugging/info output more under control?
+  (check log4j, google project)
+
+MISC
+----
+o Collect "all" available OpenSCAD scripts from the internets and batch convert them
+  to STL to assist with robustness testing.
+o Mac OS X:
+  - universal binary -> fix cgal and opencsg
+