> Even with a guard band don’t you need to at least test the polygons for Z clipping prior to the perspective divide?
Yes. Guard band is an optimization that reduces the amount of potential clipping required. You still need to be able to clip for fundamental correctness.
If you totally reject a vertex for a triangle without determining precisely where it intersects the desired planes, you are effectively rejecting the entire triangle and creating yucky visual artifacts.
Yes. Guard band is an optimization that reduces the amount of potential clipping required. You still need to be able to clip for fundamental correctness.
If you totally reject a vertex for a triangle without determining precisely where it intersects the desired planes, you are effectively rejecting the entire triangle and creating yucky visual artifacts.