(...)I think we have a lot of tile precalculation here.
Not my kind of coding. 
Let's have closer look at the 3D scene as an example.
Rough screen could be this one:
Each colum is/has a "color", as in "the 32 colors for 32*8 chars in screen mode 1".
Then, some precise timing on code changes VDP R#3 at given scanlines,
so that all colors are changed at once;
seen result is a textured applied on the 3d path.
Got it?
@Overflow, it's really cool to see you here, I didn't recognize your other posts end of last year. So probably it's too late to say "Welcome to the fantastic world of MSX!" - and as usually you placed a hit again for the Z80! 
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