Im surprised too, tetrahedralization of the data is too expensive to do direct bunyk. I already have an idea to just add an api to ResampleToImage and change the pad value to be outside my data focus range. If it works i will add an automatic mode behavior to set the pad value to be outside the data range for each array but it might have the side effect of messing up the array ranges.
I dont see the dataarray classes respecting this hidden flag either - how do you get the range of a dataarray from a structured grid with iblanking? i see code like vtkExtractDataArraysOverTime which replace invalid cells with 0.0 which seems wrong to me. I’m surely missing something.
I think the ultimate solution would be having the volume mappers skip hidden cells.