2D Radial blur is a separable filter [1], which means you can calculate it via first doing a 1D blur in one direction, and then using that intermediate result a

2D Radial blur is a separable filter [1], which means you can calculate it via first doing a 1D blur in one direction, and then using that intermediate result and doing a 1D blur in the other direction and it is equivalent to doing a 2D radial blur. Could one modify the stack blur algorithm to also operate in a separable fashion? It seems to me that one can combine Stack Blur with the separable concept to get the best of both worlds. Of course traversing the data in a way not aligned with its in-memory data layout may cause issues, so one would have to figure out an efficient way to do that. I can think of a few ways of doing that using prefetching. [1] https://en.wikipedia.org/wiki/Separable_filter https://en.wikipedia.org/wiki/Separable_filter