No subject

tensor can plot a 3D glyph (either 3 axis or an ellipsoid) which orients
with the eigenvectors of the tensor and scaled with the eigenvalues. It
seems to me that VTK tensor is designed for positive-definite symmetric
tensors. How does the glyph scale with a negative eigenvalue? In many
geophysical problem,  the trace of the tensor is 0, and one of the
eigenvalues can be negative. Is there a way to distinguish
positive/negative eigenvalues in VTK tensor?



Eh