if (dataToStencil!=NULL) dataToStencil->Delete();
dataToStencil = vtkPolyDataToImageStencil::New();
dataToStencil->SetInputData( triangle1->GetOutput() );
if (dataToStencil!=NULL) dataToStencil->Delete();
dataToStencil = vtkPolyDataToImageStencil::New();
dataToStencil->SetInputData( triangle1->GetOutput() );