Rigidbody Constraints in DOTS Physics.

[halcyon portal]

Hey, can anybody tell me how I can create constraint on Rigidbodies in the ECS Physics? The normal constraints do not work...

[scarlet patio]

You can add a LimitDOFJoint from the custom physics authoring you can get from the unity physics package manager

otherwise a solution that worked better for me was just simply setting specific physics velocities in a system

like so:

[UpdateInGroup(typeof(BeforePhysicsSystemGroup))]
partial struct Physics2DConstrainSystem : ISystem
{
    [BurstCompile] public void OnCreate(ref SystemState state) => state.Require<Physics2DTag>();

    [BurstCompile]
    public void OnUpdate(ref SystemState state)
    {
        foreach (var (velocity, transform) in SystemAPI.Query<RefRW<PhysicsVelocity>, RefRW<LocalTransform>>().WithAll<Simulate, Physics2DTag>())
        {
            velocity.ValueRW.Linear.z = 0;
            transform.ValueRW.Position.z = 0;

            velocity.ValueRW.Angular.x = 0;
            velocity.ValueRW.Angular.y = 0;
            transform.ValueRW.Rotation.value.x = 0;
            transform.ValueRW.Rotation.value.y = 0;
        }
    }
}

Not the most elegant solution but it does work

[halcyon portal]

Thank you @scarlet patio !