I've written a Cycles node tree to convert rectangular (X,Y) to polar coordinates (R,theta) as the basis for a procedural texture with radial symmetry.
However, there is a seam in the texture where theta jumps in value (-pi -> pi or 0 -> 2pi).
What are some of the techniques for eliminating this seam? I have found one method that uses a blended overlap region. Are there others?