VolumeMesher.OptimizationLevel Property
The algorithms involved here aim at optimizing both the shape quality of the elements and their size quality (length of elements' edges). Hence,
increasing the value of OptimizationLevel may lead sometimes to a reduction in the shape qualities (min, average or max value) whereas the global quality
(which takes into account both types of quality) gets better. The ShapeQualityWeight parameter controls the weight of the shape quality
in the global quality measure. Level zero disables any optimization.