Normals node

I'm wondering if there's a trick to get directional filters on slopes so the slopes from one direction can be mapped differently to replicate sand dunes that have ripples on one side: https://forum.unity.com/threads/map...ite-game-map-tool.390920/page-98#post-6531020

It should find the incline in one direction, 0 is negative, 0.5 is vertical, 1 is positive incline. Direction set with angle 0-360