[vtkusers] negative volumes from vtkTetra.ComputeVolume

[Dominik Szczerba]

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This probably has to do with the tet orientation. To only compute the
volume is OK to take the absolute value. But you should at least check
if the volume is not -inf for example, which would indicate illegal element.

Murat Aydın wrote:
> 
> Hi,
>  
> We are estimating the volume of a solid which is constructed by
> delaunay3D filter. We used vtkmassproperties and vtkTetra.ComputeVolume.
> We saw that vtkTetra.ComputeVolume gives negative volumes for some
> tetrahedrons. Should we take absolute value of those volumes? Why
> vtkTetra.ComputeVolume gives negative volumes?
>  
> Kind Regards,
>  
> murat aydin  
> 
> 
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