which recompute GImpact shape bounding box after creation as Bullet
doesn't do that itself (something it does for nearly every other shape).
Now, physical prims without cuts become single mesh convex meshes. Physical
prims with cuts become GImpact meshes. Meshes become a set of convex
hulls approximated from the mesh unless the hulls are specified in the
mesh asset data. The use of GImpact shapes should make some mechanical
physics more stable.
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