OpenGL render a quad as two triangles. The splitting edge is arbitrary.
Is there a way (in maya or a different app) to render a quad as a smoother surface? For example, this model with four 2-valence vertices:
https://drive.google.com/open?id=1GVjW1R7g6R1zLtwkfujvQstEjJLyVIh4
One way to do it is to refine and smooth the surface. However, the four vertices are sunken and need to be tweaked manually.
On the subject, is there a way to render a quad mesh with a vertex of valence 1? It means that there’s a quad where the vertex appears twice in it (i.e. it’s 2/4 of the quad vertices). When maya opens such a file, it automatically discards the quad. For example:
https://drive.google.com/open?id=104nE5RS8KqkAB_-fAf7SgGxoG8g9Fgik
see the face before last: “f 5 10 5 3”.