I'm just getting started with 3D so I'm not sure what's this is called. If I move a point in a polygon out of alignment with the other points in the polygon, such that is would be on a separate plane, what do you call it? What are the implications of doing so? Should this be avoided? Does this affect CPU? rendering? Is this universally supported by hardware and WebGL?
In my example, I have essentially turned a square plane into two triangular planes, creating a "v" in the middle of a cube. It appears that both triangles belong to a single face on the cube.