Snow accumulation ideas ?

[Frang]

Thanks for your answer and the time you have dedicated to show me your idea !

I like your simple and straightforward solution and it works pretty well from afar. I think the face selection can be done automaticaly by using a Position Object operator and by checking "density by normals" in it.

Your method add one uniform "layer" of snow and I was wondering how this idea can be pushed further, simulating more snow accumulation where it would naturaly happens.

This is what I would like see :



I've been playing around the idea and I can get up to here :



Event 1 : I generate particles on the surface depending on the Z normal of the mesh and send them to Event 2, otherwise they are deleted.

Event 2 : I push the particles upward but only if they have enough neighbors, so the particles at the edge stays where they are and are sent to Event 3 where they can rest.

Event 3 : For the demo I just use small sphere to see how it looks but it can be tymeshed for the final result.

It looks ok so far but this system is not considering the steepness of the mesh, so it generates to much particles where it should not (the steepy part of the tube, around the middle). This is why I was wondering if there was a way to prevent this ?