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GLASSEMBLY Create a GL Assembly

Section: OpenGL Models

# Usage

Define a GL Assembly. A GL Assembly consists of one or more GL Nodes or GL Assemblies that are placed relative to the coordinate system of the assembly. For example, if we have `glnode` definitions for `'bread'` and `'cheese'`, then a `glassembly` of sandwich would consist of placements of two `'bread'` nodes with a `'cheese'` node in between. Furthermore, a `'lunch'` assembly could consist of a `'sandwich'` a `'chips'` and `'soda'`. Hopefully, you get the idea. The syntax for the `glassembly` command is

       glassembly(name,part1,transform1,part2,transform2,...)

where `part1` is the name of the first part, and could be either a `glnode` or itself be another `glassembly`. Here `transform1` is the `4 x 4 matrix` that transforms the part into the local reference coordinate system.

WARNING!! Currently FreeMat does not detect or gracefully handle self-referential assemblies (i.e, if you try to make a `sandwich` contain a `sandwich`, which you can do by devious methods that I refuse to explain). Do not do this! You have been warned.