I have some mesh that is intersecting with itself in some areas. To reduce the visibility of these intersections, I want to somehow blur, blend, flatten, or otherwise smooth out the area. This will probably need to be done in the compositor. The picture shows a basic setup of two mesh pieces intersecting. The material is simple diffuse mixed with gloss based on fresnel. They have slight color variation due to the highlights and fresnel. You can see that in areas where one overlaps the other (yellow) the edge of the foreground piece is dark due to the fresnel, and stands out. I want to keep this.
In the red area, the meshes are intersecting but not near the edges. There is just enough color difference due to their shading for the intersection to be noticed (whereas a flat shaded material it wouldn't be.) I want to somehow change that area so that the intersection is less visible, but without losing detail in other areas, or losing the edge detail in the yellow area.
The bottom half of the image shows what I'm going for (done in photoshop with water droplet tool.)
EDIT: I am happy to use methods outside the compositor, such as mesh changes, etc, or even workflows that involve other programs. I just need to be able to automate it, and avoid having to hand paint/mask/edit things too much. I need a method that will work on a lot of pieces. They are animated in a simulation, so what areas are intersecting will change every frame.