ALab Physics Layers

UsdPhysics rigid body and collision layers for the ASWF ALab OpenUSD asset (v2.3.0 structure + v2.2.0 techvars).

What's in here

• 352 entity-level physics domain layers (entity/<name>/physics/<name>_physics.usda)
• 353 modified entity root files (with physics/ sublayer wired in as strongest opinion)
• 1 shot-level PhysicsScene (ALab/physics/alab_physics_scene.usda) — gravity definition

Physics breakdown

Entity Type	Count	Physics Applied
setpiece	296	RigidBodyAPI + CollisionAPI + MeshCollisionAPI(convexHull) — dynamic bodies
prop	47	RigidBodyAPI + CollisionAPI + MeshCollisionAPI(convexHull) — dynamic bodies
environment	9	CollisionAPI + MeshCollisionAPI(convexHull) — static colliders

Installation

1. Download the ALab asset structure (v2.3.0) and techvar assets (v2.2.0) from ASWF DPEL
2. Run install_optional_packages.py --techvar <zip> to merge techvars
3. Copy this repo's ALab/ folder on top of your ALab directory:

cp -r ALab/ /path/to/your/ALab-2.3.0/

This will:

• Add physics/ folders inside each entity
• Update entity root .usda files to sublayer the physics domain

4. Optionally sublayer ALab/physics/alab_physics_scene.usda into your entry.usda for the PhysicsScene (gravity).

Notes

• Collision approximation is convexHull for all bodies
• Environment entities are static colliders (no RigidBodyAPI) — walls, floors, shelving stay put
• Setpieces and props are dynamic rigid bodies — they'll fall and collide
• Characters, cameras, and mattepainting entities are untouched
• Physics layers are authored as the strongest sublayer in each entity, following the AL domain layer pattern

License

Physics layers only — the ALab asset itself is under the ASWF Digital Assets License v1.1.