[SoftBody] Soft body collision with other soft bodies: possible?

[alienself]

Hi there!

Quick question, does Jolt support soft body collision with other soft bodies? There is no demo for such thing and on my side the soft bodies go thru each other :(

I currently have the following filtering / body setup which lets me create collisions between static / dynamic objects (soft bodies also have the PhysicsLayer.MOVING layer type):

export enum PhysicsLayer {
	MOVING,
	NON_MOVING,
	KINEMATIC,
	RIG,
};

...

public setupCollisionFiltering(settings: JoltSettings): void {
  let objectFilter: ObjectLayerPairFilterTable = new Jolt.ObjectLayerPairFilterTable(NUM_OBJECT_LAYERS);
  objectFilter.EnableCollision(PhysicsLayer.NON_MOVING, PhysicsLayer.MOVING);
  objectFilter.EnableCollision(PhysicsLayer.MOVING, PhysicsLayer.MOVING);
  
  const BP_LAYER_NON_MOVING = new Jolt.BroadPhaseLayer(0);
  const BP_LAYER_MOVING = new Jolt.BroadPhaseLayer(1);
  const NUM_BROAD_PHASE_LAYERS = 2;
  
  let bpInterface: BroadPhaseLayerInterfaceTable = new Jolt.BroadPhaseLayerInterfaceTable(
            NUM_OBJECT_LAYERS, NUM_BROAD_PHASE_LAYERS);
  bpInterface.MapObjectToBroadPhaseLayer(PhysicsLayer.NON_MOVING, BP_LAYER_NON_MOVING);
  bpInterface.MapObjectToBroadPhaseLayer(PhysicsLayer.MOVING, BP_LAYER_MOVING);
  
  settings.mObjectLayerPairFilter = objectFilter;
  settings.mBroadPhaseLayerInterface = bpInterface;
  settings.mObjectVsBroadPhaseLayerFilter = new Jolt.ObjectVsBroadPhaseLayerFilterTable(
	  settings.mBroadPhaseLayerInterface, 
	  NUM_BROAD_PHASE_LAYERS, 
	  settings.mObjectLayerPairFilter, 
	  NUM_OBJECT_LAYERS);
};

and then create bodies this way:

if (isSoftBody) {
	creationSettings = new Jolt.SoftBodyCreationSettings(shape, wPosition, wRotation, layer);
else {
	creationSettings = new Jolt.BodyCreationSettings(
		shape, wPosition, wRotation, motionType, layer) as BodyCreationSettings;
}


// set collision group
if (group !== -1 || subGroup !== -1) {
	creationSettings.mCollisionGroup = this.engine.collisionFilteringManager.standardCollisionGroup;

	if (group !== -1) {
		creationSettings.mCollisionGroup.SetGroupID(group);
	}
	if (subGroup !== undefined) {
		creationSettings.mCollisionGroup.SetSubGroupID(subGroup);
	}
}

// create new body
const body: Body = isSoftBody 
	? this._bodyInterface.CreateSoftBody(creationSettings as any) 
	: this._bodyInterface.CreateBody(creationSettings as any);
// ...

[jrouwe]

No, see jrouwe/JoltPhysics#789

[alienself]

Ah thanks for the info, definitely good to know!
Is this something on your close radar or still far in the roadmap?

[jrouwe]

It is not something I'm going to work on in the near future

[alienself]

Okay no worries, thanks for the update and your super fast support!