Why are these normals not calculated correctly?
I am trying to use mDBC on a simple rectangular 2d element and the final result for the normal I see is
This is wrong as far as I know, since it should be as in the guide;
Where we see at corners 45 degree normals appears - but not in my case. When I try to visualize CaseSloshing using mDBC (for the bounding box) I see the correct normals using my approach for visualization:
What would the reason then be for my rectangular element to not have these kind of 45 degree normals?