get() {
    // can't guarantee scale was already uniform, so just use scaleX arbitrarily
    return this.threeObject.scale.x
  }
@property {null|number} raycastSide
Hook to force a different `side` than that of the material for mesh raycasting.
Should be set to `FrontSide`|`BackSide`|`DoubleSide`, or `null` to use the
material's side.