updateMatrixWorld method

@override void updateMatrixWorld([ bool force = false ])

This overrides the method in the base Object3D class so that it also updates the helper object according to the plane and size properties.

Implementation

@override
void updateMatrixWorld([bool force = false]) {
  double scale = -plane!.constant;
  if (scale.abs() < 1e-8) scale = 1e-8; // sign does not matter
  this.scale.setValues(0.5 * size, 0.5 * size, scale);
  children[0].material?.side = (scale < 0)? BackSide : FrontSide; // renderer flips side when determinant < 0; flipping not wanted here
  lookAt(plane!.normal);
  super.updateMatrixWorld(force);
}