Well.. in most case the lose of precision in 3d came from the mutiple divisions you have to do : don't forget that axe round to minus. So, check if you haven't something like that.
anyway it's look very great
(and also I think it's vertices but I am not sure)
well... what your OS? if OS > 2.53Mp then check if in your basic programme you use fonctions (like remainder) that doesn't exist in TI83+ Basic and try to remove it.
lot of things have change ... make sure to read the topic =)
What is implement so far: -texture (but outdated) -rotation/projection -perfect 3D cliping -vertex/pixel/geometry shader (!!!) -polygon drawing
TODO -light -backface culling -implementation of texture shader and precalculated normal, binormal and tangent -polygon sorting -reimplement proprely polygons drawing and pixel/geomety shader
find a way to improve the speed a lot : a litlle routine that will tell me if wall are front of me, or back. Up there, I could not implement this routine in my engine, but now I can.
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Raycasting is the word, but it's pretty fast.