PlaneDirectionViewer* PlaneDirectionViewer::getInstance(wxWindow* parent,int radio, double colour[3], int opacity){
if(instance==NULL){
instance = new PlaneDirectionViewer(parent,radio,colour,opacity);
PlaneDirectionViewer* PlaneDirectionViewer::getInstance(wxWindow* parent,int radio, double colour[3], int opacity){
if(instance==NULL){
instance = new PlaneDirectionViewer(parent,radio,colour,opacity);