Baxslash:
1. Not really sure - large values would be like looking through thick fog or gas.
2. Integer colors - these are the RGBA colors DBPro uses, with 8 bits per color and 8 bits for alpha.
colour=b+(g<<8)+(r<<16)+0xFF000000;
As for your other bugs on some hardware, I think it's to do with alpha-blending support with older GPU's. Can you tell me what cards you have on the machines and what result each one produces?
3. East is positive x, so this would be (1,sin(15),0) and sin(15) is about 0.26.
Roderick Kennedy
Simul Software