Pretty much any set of 4 fp vectors that don't share z coord will end up non-coplanar at some point (if you insist on going barycentric for texture iteration or

Pretty much any set of 4 fp vectors that don't share z coord will end up non-coplanar at some point (if you insist on going barycentric for texture iteration or if you plan on using halfplanes to do intersection or whatever). That's why HW tends to use fixed point internal representation in such places. But yeah, whatever, it's almost 1am and I shouldn't be spending time convincing people online that GPU developers know a thing or two about GPU. :) But at the very least trust me on one thing: quads are dead. They've been dead for a long, long time now, low-end or high-end, quads make no sense at all.