I’m making some non-sculpted rock formations that require tiling textures to always be horizontal. World-Aligned Texture seems perfect for this, however, I’m getting very ugly stretching at almost every 90 degree corner! How do I reduce this stretching? See picture:
Looks like your mesh is a bit too low poly. It will interpolate across faces and the top of that face has a normal that points fairly upwards, and then there is quite a long distance before another vertex with a new normal is sampled.