GRUMMP Programs

GRUMMP includes executables for two- and three-dimensional mesh generation (tri and tetra), mesh improvement (meshopt2d and meshopt3d), mesh coarsening (coarsen2d and coarsen3d), and interpolation of scattered data (scat2d and scat3d) (see Section 2.5). The only major difference among the meshing executables is their starting data:

• tri and tetra begin by creating a valid initial mesh based on the boundary geometry.
• meshopt2d and meshopt3d read a valid mesh.
• coarsen2d and coarsen3d read a valid mesh and initially coarsen the mesh by reducing the number of vertices by a factor of approximately $2^{D}$.
• surfins2d and surfins3d read a valid mesh and a discrete curve / surface, splines that discrete geometry, and inserts it into the mesh.

From this point, all these executables combine point insertion, point deletion, local mesh reconnection, and local smoothing algorithms to generate high-quality meshes. Not surprisingly, these executables share a number of command-line options. These common options are described in Section 2.1; additional options are described in Sections 2.2 and 2.3. All of these executables generate mesh quality files (see Section 3.7). In addition to the progress and status messages displayed on the screen, each executable also saves a more copious set of messages in a file (see Section 3.8).