Got sick of seeing the cube. Figured it was time for an upgrade. The glitch is a maths error in the rotation, an overflow. That'll be fixed when I convert it to the optimised assembler lookup table version. Also need to do hidden face culling. The Elite data is stored differently. Easily done still.
I can switch the offending code to use floats, but as you can see, the rotation slows down somewhat. Regardless, the z88dk maths libraries are doing a sterling job there. That's done partly using floats, and sin and cos from maths.h. It'll be much faster once I've given it the asm treatment.
Okay folks, there was a quick fix - use a long in the perspective calculation and leave the rotation as int.
Working on high resolution typesetter code (up to 3600 pixels per inch, up to 36"), coding on a 68020, we used 24.8 fixed point as our main representation. It's really hard to keep integer maths pixel accurate, but when you've got 8 spare bits, life get easier. (this was 1986/87)
Now its time to supercharge the 3D maths.
I knew you'd pick that model :D
Hehehe!
Perfection! o7
Love it, Right on Commander!
Thank you!