[vtkusers] clipping question

Langer, Stephen A. (Fed) stephen.langer at nist.gov
Mon Feb 5 13:36:23 EST 2018

Hi Bill --

Sure, please go ahead and put that example in the repository.   You might want to change the initial comment which doesn’t need to refer to the program that motivated the example.  There's also at least one unnecessary #include, vtkRenderStepsPass.h, left over from the program this was extracted from.

I do still have a question about clipping, though.  The solution you provided solves the problem for image based grids, but not if I'm also trying to visualize an unstructured grid.  What should I do if I also have a grid of tetrahedra, as in the attached example?  Are vtkClipDataSet or vtkTableBasedClipDataSet the wrong tools to use for that?


On 2/2/18, 7:58 PM, "Bill Lorensen" <bill.lorensen at gmail.com> wrote:

    These clip filters depend on the resolution size, I modified your
    example to use a higher resolution image. I'd like to add this to the
    VTKExaamples repo if is OK with you. I will acknowledge your
    On Fri, Feb 2, 2018 at 12:37 PM, Langer, Stephen A. (Fed)
    <stephen.langer at nist.gov> wrote:
    > Hi --
    > When using vtkTableBasedClipDataSet to apply two more more clipping planes to a grid, I'm seeing incorrect results along the line where the planes meet.  I've attached a simple program that demonstrates the problem and a screenshot of the output.   The program generates a vtkRectilinearGrid and pipes it through vtkTableBasedClipDataSet with its clip function set to two perpendicular planes.  The result should have a concave right angle, but diagonal facets appear instead.
    > I've tried using vtkClipDataSet instead, but it just gives different wrong answers, although it does work correctly when the clipping planes lie exactly along a row of nodes in the grid.  vtkTableBasedClipDataSet draws diagonal facets across cells in that case.
    > What am I doing wrong?
    > Thanks.
    >   -- Steve
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