The Engine
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The engine is a highly optimized little devil.  It little floating point
math and is pretty cool. It is made simple by avoiding such confusing
things as adjustable viewports, textured floors/ceiling. In short its 
a good starter kit for a 3d game.

The majority of the scaling work has been prior to run time so its not
in the source to confuse things. It will accept multiple walls, 64x64
world maps, and plain Jane 64x64 bitmaps as input. 

That's about all there is to it, buy the source are start tinkering.