Increase the frequency of the low frequency test from 0.02 to 0.3
blender/blender@ce89d7949c
adjusted the appearance and thus I needed to increase the value
to make it visible.
Add more tests for 2D Garbor for anisotropy, triggered by:
blender/blender@075bdbcd63
If there are two materials, and the nodes are the same, but the outputs are different between them
then use group nodes to keep the nodes in sync.
In the process of making this change, it was found that some materials weren't kept in sync
I also adjusted the anisotropy in the Garbor noise test. 12598 talks about a rotational bias
in garbor noise anisotropy, so increasing the ansiotropy should make it more visible in the
test file, and thus make it easier to fail when the issue is fixed.
