NAME

mmg3d — Adaptation and optimization of a tetrahedral mesh and implicit domain meshing.

SYNOPSIS

DESCRIPTION

The mmg3d application is dedicated to tetrahedral remeshing. Both surface and volume mesh are modified.

By defaults 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.
Without metric file, the -optim option allows to improve the mesh quality with respect to the initial mesh size. -optimLES option allows to improve strongly the isotropic mesh quality for LES simulations.
Providing a level-set file containing the values of the level-set function at the mesh nodes, the -ls option allows to explicitly mesh an implicit domain and the -lssurf option splits mesh boundaries on a provided isovalue.
Providing a displacement file -lag option applies a lagrangian displacement to boundary mesh nodes.

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 .mmg3d) 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, displacement or level-set file.

   -met ⟨metric_file⟩

   Load metric file in level-set mode.

3. Mode specifications (default is mesh adaptation):

   -lag ⟨n⟩

   Lagrangian mesh displacement according to mode 0 ( n=0 ), 1 ( n=1 ) or 2 ( n=2 ). This option is only available with the USE_ELAS compilation flag. The LinearElasticity library must be founded to activate this flag.

   -ls x

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

   -lssurf x

   Split boundary mesh 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 between the surface mesh and 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 (level-set mode).

   -opnbdy

   Preserve input triangles at the interface of two domains of the same reference.

   -nofem

   Do not force Mmg to create a finite element mesh.

   -noinsert

   No point insertion/deletion.

   -nomove

   No point relocation

   -nosurf

   No surface modifications.

   -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).

   -octree ⟨n⟩

   Specify the maximal number of point per octree cell (only available without the PATTERN compilation flag).

   -optim

   Mesh improvement with respect to the initial mesh size.

   -optimLES

   Strong isotropic mesh optimization for LES computations.

   -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

mmg3d returns:

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

SEE ALSO

mmgs(1) mmg2d(1)