Blank cells are not taken into account for `vtkImageData` and `vtkRectilinearGrid` in `vtkDataSetSurfaceFilter`
Blank cells are not used when producing the external surface of
vtkRectilinearGrid. An algorithm producing a correct shape on regular grids is already present inside
vtkDataSetSurfaceFilter, but only works on
vtkDataSetSurfaceFilter::StructuredWithBlankingExecute. We can use this algorithm is we add a few missing API methods in
vtkRectilinearGrid that are being used in this method. Those new APIs that are required for this algorithm make sense because they have the same regular grid structure and are indexed similarly.
- Load any data set that has not a rectilinear shape.
Let me show how it looks like currently on some example, and how it should look like: