I've created and applied the density texture image and the length texture image, and individually they appear to work, but when I try to use the length texture image to create higher density when feathers are smaller and lower density when they're larger, changing the density influence setting for the length texture image doesn't have any effect. In the image I'm attaching, you can see the smaller feathers on the face are sparse, and they remain this way whether density is checked or unchecked and regardless of the factor I change it to. Any ideas for how to make this work in 2.9?
We had another member extensively test density control with textures in 2.9 in this thread. I have a feeling your answer lies within!