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        Togl - Togl is a Tk widget for OpenGL rendering
        
        
        - Description:
- Togl is a Tk widget for OpenGL rendering. Togl was originally based on OGLTK,
written by Benjamin Bederson at the University of New Mexico. Togl's main
features are:
    * unifies Microsoft Windows, X11 (Linux/IRIX/...), and Mac OS X Aqua
      support
    * support for requesting stencil, accumulation, alpha buffers, etc.
    * multiple OpenGL drawing windows
    * simple stereo rendering support
    * simple, portable font support
    * color-index mode support including color allocation functions
    * overlay plane support
    * OpenGL extension testing from Tcl
    * Tcl Extension Architecture (TEA) 3 compliant
Togl does almost no OpenGL drawing itself, instead it manages OpenGL drawing
by calling various Tcl commands (a.k.a., callback functions). Those commands
can be C functions that call OpenGL (in)directly or another Tcl package
(e.g., Tcl3D).
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