The mmg3d application allows to improve the quality of an input mesh while keeping the mean edge lenghts of the mesh.
We consider the initial cube mesh displayed figure 1 and named cube.mesh. This mesh is provided without any associated sizemap.
Figure 1: Initial cube mesh
To improve your mesh quality while keeping the mean edge sizes, you just need to run the application using the -optim option.
mmg3d_O3 -optim cube.mesh -out optimMesh.mesh
- the -out option allows to choose the ouput file name.
- the -optim option enable the mesh improvement with mean edge length preservation.
More infos about the -optim option.
We obtain a mesh named optimMesh.mesh and the size map computed to preserve the edge sizes (see figure 2). This sizemap is saved in the optimMesh.sol file.
Figure 2: Final cube mesh using the -optim option and computed size map.
Remark:
By default, the Mmg applications try to coarsen the mesh with respect to:
- the geometric approximation
- the gradation control value
- the minimal and maximal edge sizes if specified by the user
For example, starting from our initial cube mesh, we run the application without any arguments:
mmg3d_O3 cube.mesh
We obtain the cube.o.mesh mesh displayed figure 3. As the approximation of the cube boundaries is exact, the remesher can coarse the mesh.
Figure 3: Default output mesh.
