Here are two instances during which the Rigid Dynamics solver tries to mesh the parts:
1. When you are doing rigid-flexible body dynamics; only the parts that are marked as flexible are meshed.
2. When you have any contacts defined in your model; the contact algorithm uses the mesh nodes as contact detection points so it creates a surface mesh on the faces that are included under contact/target scoping.
If you don't have either of these things defined in your model, the rigid dynamics solver should not generate any mesh on the rigid bodies.
Why does the solver try to generate a mesh on rigid bodies in an Rigid Dynamic analysis?
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