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Test surface normals

Christoph Lehmann requested to merge chleh/ogs:test-normals into master

While implementing the test the following bugs were found and fixed:

  • One wrongly oriented edge in Quad8.
  • Incomplete implementation of surface unit normal computation for 1D elements.
  • Wrong determination whether a point is contained in a line segment.

The tests are done using reference elements. In the future they can be extended to rotated, scaled and translated elements.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
Edited by Christoph Lehmann

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