[vtk-developers] patch for vtkPyramid::EvaluatePosition

Andy Bauer andy.bauer at kitware.com
Tue Apr 2 14:19:10 EDT 2013


Hi Kathleen,

Thanks for the patch. I'll take a look at it.

Andy


On Tue, Apr 2, 2013 at 2:06 PM, Kathleen S. Biagas <biagas2 at llnl.gov> wrote:

> I have a patch for vtkPyramid.cxx which corrects a problem with the
> EvaluatePosition method.  I also have a small test that demonstrates the
> problem: it creates a pyramid with vertices at (1.0, 1.0, 1.0), (-1.0,
> 1.0, 1.0), (-1.0, -1.0, 1.0), (1.0, -1.0, 1.0),(0.0, 0.0, 0.0), then
> calls EvaluatePosition for each of the following Points printing a
> message whether the point is considered inside or outside the cell:
>
> (0.0, 0.0, -0.03)
> (0.0, 0.0, -0.005)
> (1.005, 1.005, 1.0)
> (0.0, 0.0, 0.5)
>
>
> I couldn't determine how this small test case would fit within your
> testing framework, or I would push it to gerrit with the vtkPyramid.cxx
> patch.  Shall I commit the patch anyway?
>
> Kathleen
>
>
> Here's various results of the tests with different vtk versions:
> (all run on rhel-6, using gcc-4.4)
>
> Results of test when run with VTK-5.8:
>
> Point 0 0 -0.03 is outside the pyramid.
> Point 0 0 -0.005 is outside the pyramid.
> Point 1.005 1.005 1 is outside the pyramid.
> Point 0 0 0.5 is inside the pyramid.
>
> Results of test when run with snapshot of master from this morning
> (04-02-12):
>
> Point 0 0 -0.03 is inside the pyramid.
> Point 0 0 -0.005 is inside the pyramid.
> Point 1.005 1.005 1 is outside the pyramid.
> Point 0 0 0.5 is inside the pyramid.
>
> Results of test with proposed change to vtkPyramid.cxx:
>
> Point 0 0 -0.03 is outside the pyramid.
> Point 0 0 -0.005 is outside the pyramid.
> Point 1.005 1.005 1 is outside the pyramid.
> Point 0 0 0.5 is inside the pyramid.
>
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