Demos in TutorialsAndBooks/RedBook
The Redbook describing OpenGL Version 1.4 contains 72 examples written in C. 68 of them have been successfully converted into equivalent Tcl3D scripts and the results compared on several operating systems and computers against the C version.
Three of the missing five examples (surfpoints, tess, tesswin) deal with tesselation, which is currently not supported. The other two test programs (aaindex, fogindex) not yet ported deal with color index mode, which is not implemented in the tcl3dTogl widget.
Original sources available at: http://www.opengl-redbook.com/