if( image == NULL )
return( "MarchingCubes: Input data is not a valid image." );
vtkImageData* vtk_image = image->GetVTK< vtkImageData >( );
if( image == NULL )
return( "MarchingCubes: Input data is not a valid image." );
vtkImageData* vtk_image = image->GetVTK< vtkImageData >( );