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