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Fix & update visualization of stress eigenvectors

Lukas Riedel requested to merge fix-stress-ev-output into master

What does this MR do?

  • Fix an error in the calculation of the stress eigenvectors. The strain tensor contained a wrong summation, which has been removed. Additionally, the stress tensor did not contain the full strain trace on its diagonal. Both issues have been fixed.
  • Add the configuration option continuous to the stress EV visualization. This allows toggling of a P1 (vertex) or a P0 (cell) representation of the EVs.
  • Remove output of the index of the largest EV. This simply was leftover code from !8 (merged).
Edited by Lukas Riedel

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