I've been experimenting with vertex colors on the default cube. I've painted three vertices, as is visible in the picture:
My question is, why does the upper right face visible in the picture form a stripe where opposite vertices are colored, while the the other two visible faces are colored differently?
It seems that in any given quad, coloring the top left and bottom right vertices will form a stripe in the middle, and the other two vertices will color in the other parts. My assumption is that this is because each quad is really two triangles, and the coloring is more greatly "stretched" along the longer side, creating the stripe in the middle. Is this correct?