This calculates the maximum warp (in degrees) of all elements. This works only for structured volume and surface meshes, linear hexahedral and linear quadrahedral elements. To determine warp of a quadrilateral face, find the midpoints of all edges, which will be co-planar. Then, calculate the maximum angle of any edge with the plane as defined, which is the warp of the face. The maximum warp of a volume element or hexahedron is the maximum warp of its faces. For a 2D, planar mesh of QUAD_4 elements, the warp will be zero for all elements. The default range is 0–90 degrees.