When creating shaders, sometimes random scattering of textures works like a charm and feels very natural. Other times however, there’s a strong directional bias to how the surface features are scattered on an object. A good example is for example a clay shader. Our hands move in very specific ways across the surface in order to shape the sculpture.
The ability to do this procedurally has been on my “this is missing in our shading toolkit” list for a while, so, here we go!
Please see the full description here: http://zenopelgrims.com/directional-image-scattering/