I want to be able to create THICK dust and old congealed cobwebs on the surfaces of a composition - similar to the image below (not the best example but hopefully you will see what I mean).
This will be incidental the main subject of the composition so doesn’t need to be ridiculously detailed. It should look right however.
So far I have considered trying particle systems which I imagine might work well. Also wondered whether some form of smoke simulation might work. I want the stuff to sit above the surface.
Any help and suggestions gratefully received