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

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

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

rByR: 
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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