Physics Body Constraint Velocity on one Axis

Unity Engine
, , ,
1

Hi,

Problem: I simply want to freeze the z position of my PhysicsBody in ecs/dots… like in usual Rigidbody Constraints Freeze Position Z

public partial struct ConstraintZVelocitySystem : ISystem
{
    [BurstCompile]
    public void OnUpdate(ref SystemState state)
    {
        foreach (var (velocity, mass)
                 in SystemAPI.Query<RefRW<PhysicsVelocity>, RefRO<PhysicsMass>>())
        {
            var vel = velocity.ValueRW.Linear;
            vel.z = 0f;
            velocity.ValueRW.Linear = vel;
        
// velocity = float3.zero;

        }
    }
}

This simply does not work correctly I mean even if I just set the velocity to 0 the PhysicsBody keeps moving / “floating”

I could not figure it out even though searching for older answers because somehow nothing worked for >v1.0

Please help…
Thanks!