Nov. 10

Collision Issue

collision issue

I encountered some particle colliding issue, the particles will slide down from the inner edges of the geometry, as if it has been beveled. And no matter how I turn up the solving substeps or the division of the cube, it won't help. So I assumed it has nothing to do with the mesh and made some experiment.

test 1

test 2

It turns out that how much the collision object looks beveled was related to the size of itself. So I dived in to the staticObject node inside dopnet and checked RBD solver. After messing with thoes parameters I found one that was affecting the shape of collsion, Uniform Divisoins.

The Uniform Division parameter controls the resolution of the collision volume representation. When an object is set as a static collider, Houdini converts it into a volumetric grid (voxels) for collision detection, and the Uniform Division parameter specifies the number of voxels, impacting the resolution of this collision volume.