Hi, I'm extremely new to Houdini and I'm trying to create sand winds like in here: https://www.reddit.com/r/Houdini/comments/kh7ytl/approach_to_creating_dunes_like_these/ [www.reddit.com]

My approach is to create particles (sand grains) that spawn on the heightfield, before being blown by a wind simulation or something (or instead of individual grains, just a smoke simulation)

What I have so far is a Procedural desert heightfield. I followed a tutorial to set up a smoke simulation that advects to a pyro,, but I'm struggling with setting up collisions and figuring out how to spawn the smoke/sand procedurally on the heightfield.

My pyro sim:

image.thumb.png.abb8b9404e72e80e18be049cbf165951.png

My heightfield:

image.thumb.png.4afdc349e191c41d95db8b47032e2066.png

Any help would be much appreciated! I can elaborate on any part so I can get advice better.