Ok so, the plan. Body and World objects will be replaced with stubs

Expected breaking changes remove physics from aframe-extras,

Support physics in a Web Worker about aframe-physics-system HOT 2 CLOSED

n5ro commented on July 28, 2024

Support physics in a Web Worker

from aframe-physics-system.

Comments (2)

donmccurdy commented on July 28, 2024

Expected breaking changes

remove physics from aframe-extras, or deliver only local driver
remove support for kinematic-body
default shape to box, not trimesh

from aframe-physics-system.

wmurphyrd commented on July 28, 2024

This is going to be great for performance!

Regarding collisions, physics-collider loops through the world contact equations and used references to the collider's body object and the other bodies' references to their elements. Since we'll no longer have access to body references from the scene nor entity references from the physics worker, perhaps return a map of colliding object IDs

// in the physics worker
var collisions = {};
world.contacts.forEach( contact => {
  let bodID1 = bodyToIDWeakMap.get(contact.bi), // a WeakMap global in the service worker
    bodID2 = bodyToIDWeakMap.get(contact.bj);
  if(collisions[bodID1]) { collisions[bodID1].push(bodID2); } else { collisions[bodID1] = [bodID2]; }
  if(collisions[bodID2]) { collisions[bodID2].push(bodID1); } else { collisions[bodID2] = [bodID1]; }
});

// and in client components
var collisions = this.el.sceneEl.systems.physics.data.state.collisions,
  IDMap = this.el.sceneEl.systems.physics.IDToEntityMap;
var myCollidedEntities = collisions[IDMap.get(this.physicsBodyID)] && 
   collisions[IDMap.get(this.physicsBodyID)].map(IDMap.get);