[vtkusers] calculating volume of unstructured grid

[Murat Aydın]

Hi,

How could volume of a solid that is constructed from unstructured grid be calculated?

Answer:
We can use vtkMassProperties and ss you know vtkMassProperties gets poly data as input. So before using it we have to
do some conversions.
I use unstructured grids to form a volume with Delaunay3D algorithm. After that i set the output of Delaunay 3D to input
of vtkGeometryFilter. vtkGeometryFilter converts data to poly data. Then i set output of vtkGeometryFilter to input of
vtkTriangleFilter. Because poly data should be triangulated before vtkMassProperties. Then i set output of vtkTriangleFilter
to input of vtkMassProperties. And GetVolume() method of vtkMassProperties gives the calculated volume.

In a nutshell, 
unstructured grid -> vtkDelaunay3D -> vtkGeometryFilter -> vtkTriangleFilter -> vtkMassProperties -> volume.

Hope this helps.

murat aydin.
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