For tris, this is calculated as the radius of the inscribed circle divided by the maximum edge length and normalized by the value of an equilateral triangle with edge length 1.

For quads and hexas, the calculated value is the minimum edge length divided by maximum edge length normalized by the value for the idealized quad (cube) of length 1.

For pentas and pyramids, this is calculated as the minimum of the element stretches of the quad and triangle sides.

For tetras, this is calculated as the radius of the inscribed sphere divided by the maximum edge length normalized by the value of an equilateral tetra with edge length 1.