pfacet interactions issue

Hello,

I am using pFacet in my simulations and aiming to model rigid behavior. To achieve this, I clumped together the gridNodes, gridConnections, and pFacet into a single clump. However, I encountered an issue: after creating the clump, it does not interact with spheres.

To illustrate this, I’ve prepared a minimal working example (MWE). In the setup, I model four gridNodes connected via gridConnections, then form a pFacet from them. I clump the nodes, connections, and pFacet together and fix the degrees of freedom (DOFs) of the clump. Then I drop a single sphere above the pFacet under gravity.

Problem: When the components are clumped, the sphere passes through without interaction. But if I skip the clumping step and instead set fixed=True on the nodes (to fix pfacet position), the sphere correctly interacts with the pFacet.

Am I missing something regarding interaction behavior with clumped pFacets?

The MWE is attached for reference: simple_pfacet_interaction_code.py