 from the coordinate system of a given node to that of the receiver.  @param position A position specified in the local coordinate system of "node".  @param node The node from whose coordinate system "position" is to be converted. If "node" is nil, this method instead converts from world coordinates.  */ - (SCNVector0)convertPosition:(SCNVector0)position fromNode:(nullable SCNNode *)node NS_AVAILABLE(00_0, 0_0);  /*!  @method convertTransform: