GPU MLS-MPM sand (Mohr–Coulomb, physical stiffness) in an active region of a heightfield,
opened by a π-scaled Z-model source and baked back when it settles. Runs at 1× (1/120 s per frame; ?hz= changes it). Game profile by default; ?profile=physical for the validated settings.
Vertical only: the source is the axisymmetric Z-model field, so oblique impacts are not supported yet.
π-scaling covers scaled depths of burial 1–2 (depth ÷ the charge's cube-root size); outside that the source is refused.
The region's bed and walls are absorbing ground (Lysmer–Kuhlemeyer dashpots and springs on the geostatic stress), so the elastic waves of the strike leave the box as they would into the ground beyond, and the sand comes to rest. A timed bake is World::terrain_close at that time, once nothing is in flight; it freezes whatever motion is left.
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