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What are the mesh quality statistics at the end of the Meshing output file?

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The equilateral or equivolume skewness is non-dimensional ranging from 0 (perfect tetrahedron) to 1 (degenerate). 
S = ( V_opt - V ) / V_opt 
V_opt = 8/27 * sqrt(3) * R^3 = Perfect tetrahedron volume 
V = tetrahedron volume 
R = circumsphere radius

Aspect ratio is non-dimensional ranging from 1 (perfect tetrahedron) to infinity (degenerate). 
AR = Longest Edge / Shortest Altitude

Cosine of the dihedral angle of the tetrahedron. Smallest and largest are given.

The unitized ratio of the insphere radius to the circumsphere radius of the tetrahedron. You see '-1.0' as the minimum if there are non-tetrahedral elements.


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