Hi,
I’m a new VTK user wanting to find the distance from a vtkPolyData surface to the points of a structured vtkImageData grid…
My problem is in understanding the logic beneath vtkSignedDistance, if anyone can help! correct me if i’m wrong 

SetBounds() sets limits of ImageData grid

SetDimensions() sets increments of grid, i.e. number of points within

what does radius do? the documentation is unclear to me; does this set (a) the radius from the centre of the polydata object to sweep, (b) the maximum mindistancefromobjectsurface it will record, (c) the radius the filter will sweep from each gridpoint as it iterates through, or (d) something else?
the documentation recommends keeping radius low (default=0.1), so how does this fit into the above?
Thanks