NAME

mmgs — Adaptation and optimization of a surface triangulation representing a piecewise linear approximation of an underlying surface geometry.

SYNOPSIS

DESCRIPTION

The mmgs application is dedicated to surface triangulation remeshing.

By default it performs mesh modifications in order to control the surface approximation.
Providing a metric file, it adapts the mesh to the prescribed sizes at nodes.
-optim option allows to improve the mesh quality with respect to initial mesh size and the surface approximation respect.
Providing a level-set file containing the values of the level-set function at the mesh nodes, the -ls option allows to explicitely mesh an implicit domain and the -lssurf option splits boundary edges of the mesh on a provided isovalue.

COMMAND LINE ARGUMENTS

1. Generic options:

   -h

   Print help.

   -v ⟨n⟩

   Tune level of verbosity.
   Takes values between -1 and 10.

   -m ⟨n⟩

   Set maximal memory size to n MBytes.

   -d

   Turn on debug mode.

   -default

   Write a local parameter file (with extension .mmgs) with setted values.

   -val

   Print the default parameters values.

2. File specifications:

   -in ⟨mesh_file⟩

   Input triangulation.

   -out ⟨output_file⟩

   Output triangulation.

   -sol ⟨solution_file⟩

   Load metric or level-set file.

   -met ⟨metric_file⟩

   Load metric file in level-set mode.

3. Mode specifications (default is mesh adaptation):

   -ls x

   Create mesh of isovalue x (0.0 if x is not provided).

   -lssurf x

   Split boundary edges on isovalue x (0.0 if x is not provided).

4. Parameters:

   -A

   Enable anisotropy (without metric file).

   -ar ⟨x⟩ | -nr

   Threshold for angle detection or sharp features detection disabling.

   -hmin ⟨x⟩

   Minimal mesh size.

   -hmax ⟨x⟩

   Maximal mesh size.

   -hsiz ⟨x⟩

   Constant mesh size.

   -hausd ⟨x⟩

   Control the Hausdorff distance to the underlying surface geometry.

   -hgrad ⟨x⟩

   Control the gradation.

   -hgradreq ⟨x⟩

   Control the gradation from required entities toward others.

   -rmc x

   Remove componants whose volumic fraction is less than x (1.e-5 if x is not provided) of the whole mesh volume or not connected to base references provided in parameter file (level-set mode).

   -keep-ref

   Preserve initial domain references when create the mesh of isovalue.

   -noinsert

   No point insertion/deletion.

   -nomove

   No point relocation

   -noswap

   No edge or face flipping.

   -nosizreq

   No imposition of the size of required edges over required vertices.

   -nreg

   Normal regularization using laplacian - antilaplacian smoothing.

   -xreg

   Vertex coordinates regularization using laplacian - antilaplacian smoothing.

   -nsd ⟨n⟩

   Save the subdomain of index n (default is n=0 which save all subdomains).

   -optim

   Mesh improvement with respect to the initial mesh size.

   -rn ⟨n⟩

   Turn on ( n=1 ) or off ( n=0 ) the renumbering using the SCOTCH library (only available with the USE_SCOTCH compilation flag and if the scotch library is founded).

RETURN VALUES

mmgs returns:

• the 0 value if successful;
• the 1 value if the process fail but we can save a conform mesh;
• the 2 value if the process fail and we can't save a conform mesh.

SEE ALSO

mmg3d(1) mmg2d(1)