Unstructured grids consisting of triangles and tetrahedra are generated by a modified Delaunay method. Like structured grids, unstructured surface grids can span multiple entities in the geometry model and adhere to the CAD model automatically. The unstructured solver may be re-applied at any time, giving you control over minimum and maximum cell size, maximum cell-to-cell turning angle, maximum surface deviation, and boundary decay.

These attributes may also be set in advance to result in a good grid automatically. Edge swapping and LaPlace smoothing may also further improve unstructured surface grids.

High aspect ratio triangular surface meshes can be created by diagonalizing an existing quad grid.