[vtkusers] Question about visualization

[longbowzhang]

Basically you try to visualize a 3-by-3 symmetric matrix.
The natural choice is to use an ellipsoid.

Unfortunately, you have *negative* eigenvalues.
Therefore, the most elegant visualization should be this 
SuperquadricTensorGlyph
<http://people.cs.uchicago.edu/~glk/sqd/schultzTVCG10SuperquadricTensorGlyphs.pdf> 
.
The  code <http://web.ci.uchicago.edu/~schultz/sphinx/superquadrics.html>  
is based on OpenGL, rather than VTK.

Hope this could help or inspire you to some extent.

Longbow



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