Simulation

The execution model is in blender-core. Procedural sim zones are in blender-geometry-nodes.

One call

scripts/sim_setup.py -- --rigid --active Crate1 Crate2 --passive Floor --density 500 --frames 1 120 --bake --to-keys
scripts/sim_setup.py -- --cloth Flag --preset cotton --pin Pin --colliders Pole --bake
scripts/sim_setup.py -- --gn-cloth Sheet --colliders Table --set Bendiness=0.5 Stretchiness=0.1 --bake

--bake steps through every frame in order (this works headless for point caches and GN simulation zones) and reports final positions and min_z, so you can verify contact. --to-keys turns rigid-body motion into keyframes for engines.