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The maximum angle (maxangle), which is based on the largest angle in the element. If no angle is larger than the largest angle of the corresponding optimal element, the quality is one; otherwise, the measure shows how much larger the angle is. This quality measure is insensitive to element anisotropy.
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The volume versus circumradius (volcircum), which is the default quality measure, is based on the ratios of the inscribed and circumscribed circles’ or spheres’ radii for the simplex corresponding to each corner of the element. If the simplex cannot be clearly determined (an apex of the pyramid, for example), the corresponding corner is excluded from the consideration.
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The volume versus length (vollength), which is based on a quotient of element edge lengths and element volume. This quality measure is primarily sensitive to anisotropy.
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The condition number (condition), which is based on the element dimension divided by the condition number (in the Frobenius norm) of the matrix transforming the element to a reference element.
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