Yeah, I also have no intuition about this and fail to grasp the problem. When the author talked of rendering a slightly larger mesh to a white texture I just as

Yeah, I also have no intuition about this and fail to grasp the problem. When the author talked of rendering a slightly larger mesh to a white texture I just assumed that was it, but apparently not. I assume much of the complexity is to do with where in the pipeline this issue is being handled (i.e. just in shaders).