[vtkusers] Size of a surface

[Jana Sefcikova]

Hi Clemens,

for sphere created by vtkSphereSource you could deduct surface area
analytically by 4*PI*(R^2) where R = vtkSphereSource::GetRadius .

For generic surface you can iterate over its cells and sum cells area if
cell type supports ComputeArea method. For example if cell is triangle type
you can use vtkTriangle::ComputeArea (Example:
TriangleArea<http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/TriangleArea>)
.

Perhaps there are also other methods.

Jana
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