Question How to create Joints in 0.50.0

The ECS samples for physics haven't been updated just yet, and the documentation is a little sparse when it comes to joints.

What is currently needed to create a joint (Fixed Joint for example) between two entities?

I tried to add the component returned by:

PhysicsJoint.CreateFixed

but that seems to have no effect.

A simple example to create a fixed joint would be appreciated.

 

I tried the following:

Code (CSharp):

1.      
2. var joint = PhysicsJoint.CreateFixed(new BodyFrame(), new BodyFrame());
3. var jointEntity = ecb.CreateEntity();
4. ecb.SetName(jointEntity, $"FixedJoint {e.EntityA.Index} - {e.EntityB.Index}");
5. ecb.AddComponent(jointEntity, new PhysicsConstrainedBodyPair(e.EntityA, e.EntityB, false));
6. ecb.AddComponent(jointEntity, joint);
7.  

But it seems that these constraints have no effect (although the entity is created.

I probably am missing something small to make it work properly.

 

Code (CSharp):

1. EntityManager.AddSharedComponentData(jointEntity, new PhysicsWorldIndex(0));
2. var bodyPair = new PhysicsConstainedBodyPair(bodyA, bodyB, collisionEnabled);
3. EntityManager.SetComponentData(jointEntity, bodyPair);
4. var joint = PhysicsJoint.CreateFixed(
5.                     new RigidTransform(OrientationLocal, PositionLocal),
6.                     new RigidTransform(OrientationInConnectedEntity, PositionInConnectedEntity)
7.                 );
8. EntityManager.SetComponentData(jointEntity, joint);

 

Indeed forgot to set the `PhysicsWorldIndex`, Thank you!