I have been considering doing something in 3D with polygons, etc. recently (and have already started writing some routines to play around with things). So, when I saw this post I became interested, and I have started disassembling one of the Freescape games ("Castle Master 2"), to take a peek at the drawing routines. Understanding and annotating disassembled code is a tedious and long process, so, it will take me a few weeks. But if I find anything interesting, I'll report back. I also wonder how easy would it be to port to MSX once I understand all the code in the disassembly.
Today I already managed a first disassembly where I located all the code/data blocks, and have a .asm file that if I compile I can run the game. So, that's a starting point 
That sounds great !
I was thinking of a different approach: take a Freescape game (I chose Dark Side), locate the Spectrum-only routines, such as keyboard, joysticks reading, sound and VRAM dump, translate to MSX and test...
I mean, I would like to do an old-style conversion first, then add exclusive features for MSX, such as better graphics, music, etc.
I would like to locate basic routines for basic graphics, such as lines, points, etc and, maybe, translate to MSX2.
I do not aim to understand the routines that calculate polygons, shapes, sizes, trigonometrics, etc. For me that is "black magic" 
Santi, I wish you good luck with it and hope to read good news soon.
