This is my second version of a textured triangle filler. feel free to use it. The first 9 inputs contain the x,y,z coordinates of the 3 points between which you want to create a triangle. The u,v coordinates come into inputs 10 to 15. It is important to divide the u and v coordinates by the appropriate z and pack them into the z inputs 1/z. I am working on a new version with all bugs fixed and smoth shading.