[CIG-SHORT] Principal Stress Axes

[BOK10 at pitt.edu]

Hi,

I've been trying to take the stress output (Sxx, Syy, Sxy) and convert
them to principal stress values and solve for the orientation of S1 in the
global coordinate system. Is there a way to do this in Paraview? Also,
does the stress output (vtk) write as a local system with the origin in
the centroid of each cell with the x-axis parallel to the vector from the
first node to the next, or is the vtk output based on cartesian x/y
directions in my model? My model is a 2D model of strike-slip faults.

I've been calculating the cell centers and exporting the cell data to
excel to calculate the orientation of S1. This has been rather tedious
considering the limitations of excel. Any insight in how to do this in
Paraview, or if what I have been doing so far is on the right track would
be greatly appreciated.

Bobby