Maximum corner angle is computed and tested for all except Emag elements. Some in the finite element community have reported that large angles (approaching 180°) degrade element performance, while small angles don't.
Maximum Corner Angle Calculation
The maximum angle between adjacent edges is computed using corner node positions in 3-D space. (Midside nodes, if any, are ignored.) The best possible triangle maximum angle, for an equilateral triangle, is 60°. Figure 49: Maximum Corner Angles for Triangles shows a triangle having a maximum corner angle of 165°. The best possible quadrilateral maximum angle, for a flat rectangle, is 90°. Figure 50: Maximum Corner Angles for Quadrilaterals shows quadrilaterals having maximum corner angles of 90°, 140° and 180°.
