hassisWorldTransform()
          p = tm.getOrigin()
          q = tm.getRotation()

          this.chassis.position.set(p.x(), p.y(), p.z())
          this.chassis.quaternion.set(q.x(), q.y(), q.z(), q.w())
        }

        addWheel(isFront, pos, radius, index) {
          var suspensionStiffness = 50.0
          var suspensionDamping = 2.3
          var suspensionCompression = 4.4
          var suspensionRestLength = 0

          const friction = 50
          const rollInfluence = 0.01

          const w