Advanced use of the mmgs library for an adaptation test case

I/ Implementation

To call the mmgs library, you must:

1. build mesh and sol at MMG5 format;
2. call the MMGS library;
3. get the final mesh and sol.

We read mesh and solution files using the MMGS_loadMesh and MMGS_loadSol functions.

• First we remesh in debug mode:
  • we ask for a minimal size of 0.001, a maximal size of 40, a gradation of 2 and a global hausdorff value (applied on all the boundaries) of 0.1;
  • we save results.
• Second, we remesh in normal mode, with specified memory and lower verbosity:
  • in addition to previous parameters, we ask that all boundary triangles of ref 36 respect a minimal edge size of 0.005 and a maximal one of 0.05 and all boundary triangles of ref 38 must respect a minimal edges size of 0.1 and a maximal one of 1. For both reference, we set the hausdorff value to 1.
  • we save the mesh and solution.

II/ Compilation

1. Build and install the mmgs shared and static library. We suppose in the following that you have installed the mmgs library in the **_$CMAKE_INSTALL_PREFIX_** directory (see the installation section of the setup guide);
2. compile the main.c file specifying:
   • the mmgs include directory with the -I option;
   • the mmgs library location with the -L option;
   • the mmgs library name with the -l option;
   • for the static library you must also link the executable with, if used for the mmgs library compilation, the scotch and scotcherr libraries and with the math library;
   • with the shared library, you must add the ***_$CMAKE_INSTALL_PREFIX_** directory to your LD_LIBRARY_PATH.

‍Example 1
Command line to link the application with the mmgs static library (we supposed here that the scotch library is installed in the **_$SCOTCH_PATH_** directory):

gcc -I$CMAKE_INSTALL_PREFIX/include/mmg/mmgs main.c -L$CMAKE_INSTALL_PREFIX/lib -L$SCOTCH_PATH -lmmgs -lscotch -lscotcherr -lm

‍Example 2
Command line to link the application with the mmgs shared library:

gcc -I$CMAKE_INSTALL_PREFIX/include/mmg/mmgs main.c -L$CMAKE_INSTALL_PREFIX/lib -lmmgs
export LD_LIBRARY_PATH=$CMAKE_INSTALL_PREFIX/lib:$LD_LIBRARY_PATH