sd%chem@UCSD.EDU (Steve Dempsey) (03/29/88)
I have just discovered that the "zclear()" function only affects the portion of the z-buffer defined by the current viewport. Thus it behaves analogously to "clear()". The manual entry is ambiguous on this point. It states: zclear loads the z-buffer with the largest possible positive integer. I originally made the assumption that zclear affected the entire z-buffer, resulting in some entertaining, but frustrating images.