God, your statement about the zbuffer is true too, and as you say it was too imperceptible to notice - though if I'd looked carefully there would surely have be

God, your statement about the zbuffer is true too, and as you say it was too imperceptible to notice - though if I'd looked carefully there would surely have been some strange effects where polygons intersected. I didn't even think about the zbuffer and the shading when I wrote my engine - I was too preoccupied by the weirdness of the textures.