(Relatively new to Houdini). I am having trouble with a "fountain" simulation (using Particles, not fluids) where the particles seem to fall through the static object I setup. Here's a picture of the problem. The white particles on the outside of the fountain are falling through the wall.
You can see that inside the fountain there are many particles gathered on the inner edge (and not falling through). There is a PopAxisForce setup pushing the particles on the bottom away from the center:
The PopNet is relatively simple:
The static object is setup to use a SOP Path: `opinputpath("../", 1)`
It is then setup to use `Volume Collisions` and `Mode` = `Volume Sample`
The model for the static object is just an extruded grid with an extruded tube on top of it. I then use `vdbfrompolygons` with a `Voxel Size` of 0.01. If I turn on `Collision Guide` in the Static Object, it shows that it's covering everything rather well.
... and just now as I was writing this, I changed the Voxel Size on `vdbfrompolygons` to 0.1 and now (after a reset simulation) everything is working just fine.
So perhaps my question then is, why does a smaller voxel size allow particles to fall through?
The entire setup in case it's relevant.
Thank you!
Dan