[vtkusers] How to compute volume of cell

[Alex Malyushytskyy]

I am not sure vtk provides a dedicated function,
but structured grid made of hexahedron means every cell is hexahedron.

As far as I can recall the simplest way to compute hexahedron volume would
be splitting it in 3 pyramids with quadrilateral base.
Volume of such pyramid is area of the base multiplied by height.

If it is not easy enough you could split it on on tetrahedrons then use
   double<http://www.vtk.org/doc/nightly/html/vtkVectorOperators_8h.html#a45c855d65dd0e2b57b08024500ff9159>vtkTetra::
ComputeVolume<http://www.vtk.org/doc/nightly/html/classvtkTetra.html#aa03df80e3eb54d350b953b8cc798cd8b>(
double<http://www.vtk.org/doc/nightly/html/vtkVectorOperators_8h.html#a45c855d65dd0e2b57b08024500ff9159>p1[3],
double<http://www.vtk.org/doc/nightly/html/vtkVectorOperators_8h.html#a45c855d65dd0e2b57b08024500ff9159>p2[3],
double<http://www.vtk.org/doc/nightly/html/vtkVectorOperators_8h.html#a45c855d65dd0e2b57b08024500ff9159>p3[3],
double<http://www.vtk.org/doc/nightly/html/vtkVectorOperators_8h.html#a45c855d65dd0e2b57b08024500ff9159>p4[3])
to compute volume of each.

Regards,
    Alex


On Sat, May 18, 2013 at 9:44 PM, Alexandre Boucher <afboucher at gmail.com>wrote:

> Hello,
>
> Does vtk provides an easy way of computing the volume of a vtkCell3D.  I
> have a vtkStructuredGrid (made of hexahedron) and I would like to retrieve
> the volume of any cell within that grid.  How would I proceed?
>
> Thanks,
> Alex
>
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