- filter->SetNeighborhoodFunction( neig );
- filter->SetCostFunction( cost );
- filter->SetCostConversionFunction( conv );
+ if( neig != NULL )
+ filter->SetNeighborhoodFunction( neig );
+ if( cost != NULL )
+ filter->SetCostFunction( cost );
+ if( conv != NULL )
+ filter->SetCostConversionFunction( conv );