[vtkusers] Volume 3-D Contours

[Patrick Lowry]

Greetings All:

I am looking for guidance on interpreting the vtkMassProperties-Volume of 
poly data generated with vtkContourFilter.  The volume returned by 
vtkMassProperties does not appear to relate to the volume estimated by 
summing the volume of the cells circumscribed by the same 3-D contour, with 
the former being much greater.  Should the volume not be in the cubic units 
(x*y*z) of those defining the vtkContourFilter poly data?

I would like to think that vtkMassProperties-Volume of a close 3-D contour 
generated by vtkContourFilter would be in the real world volumetric units 
of the input data.  Is this how it should work and I am just doing 
something wrong or am I expecting too much.

Any help would be appreciated.

Patrick Lowry
The Scotia Group