**mmg2d

Description

This command is used to remesh and optimize a Zebulon triangular mesh by means of MMG2D remeshing library. MMG2D is part of the open source (LGPL license) MMG platform and interfaced with Zebulon through it’s C language API.

Note that only linear elements are handled by mmg2d. A combination of the quad_to_lin (before mmg2d) and lin_to_quad commands (after) may then be used. Yet, the command quad_to_lin may degrade the initial mesh and, when lin_to_quad is used, the quadratic nodes are not projected on the geometry.

Syntax

We distinguish two types of syntaxes: specific to all mmg tools (mmg3d, mmgs, mmg2d) and necessary for preserving FEM requiered mesh entities.

**mmg2d \(~\,\) *min_size hmin \(~\,\) *max_size hmax \(~\,\) [ *verbose int-value ] \(~\,\) [ *hgrad double-val ] \(~\,\) [ *hausd double-val ] \(~\,\) [ *angleDetection degree ] \(~\,\) [ *nodetection ] \(~\,\) [ *nosurf ] \(~\,\) [ *noinsert ] \(~\,\) [ *nomove ] \(~\,\) [ *noswap ] \(~\,\) *metric [ default/scalar/from_function/from_file/uniform_from_field ] \(~\,~\,\) [ metric_options ] \(~\,\) [ *preserve_elsets elsets-names ] \(~\,\) [ *preserve_elsets_start_with elsets-start-with-names ] \(~\,\) [ *preserve_bsets bsets-names ] \(~\,\) [ *preserve_bsets_start_with bsets-start-with-names ] \(~\,\) [ *freeze_elsets elsets-names ] \(~\,\) [ *freeze_elsets_start_with elsets-start-with-names ] \(~\,\) [ *freeze_bsets bsets-names ] \(~\,\) [ *freeze_bsets_start_with bsets-start-with-names ] \(~\,\) [ *freeze_nsets nsets-names ] \(~\,\) [ *freeze_nsets_start_with nsets-start-with-names ] \(~\,\) [ *corners nsets-names ] \(~\,\) [ *corners_start_with nsets-start-with-names ] \(~\,\) [ *output_mmg_files ]

All syntaxes are identical to the ones of **mmg3d and the reader is invited to see their description on page

Example

****mesher
 ***mesh
  **open ../GEOF/carre.geof
  **mmg2d
   *metric scalar
    value 0.1
   *min_size .1
   *max_size 2.
   *hgrad 1.
   *verbose 6
   *preserve_elsets diag mix
   *preserve_elsets_start_with eset
   *freeze_elsets diag
   *preserve_bsets  left top bottom
   *freeze_bsets left
   *freeze_nsets_start_with  x y diag
   *freeze_nsets diag
  **output carre_remeshed.geof
****return