Mmgs - fails to refine surface

User Help
#1

Hello.

This is my first time using mmgs. I tried to improve the quality of one of my surface meshes using mmgs. Here is the input mesh: DBChaise.mesh (2.8 MB)

I wrote the mesh file using Matlab, in the format .mesh. GMESH is able to open it, so I guess I don’t have syntax errors in the mesh file.

When running mmg the program starts running, but it does nothing to the mesh. The input is the same as the output. I run the command

mmgs_O3 -in DBChaise.mesh -hausd 0.0001 -nr -out DBChaiseRef.mesh

and the output is

    -- MMGS, Release 5.3.6 (Apr. 10, 2017) 
     Copyright (c) IMB-LJLL, 2004-
     Nov 20 2017 20:57:25

  -- INPUT DATA
  %% DBChaise.mesh OPENED
  MAXIMUM MEMORY AUTHORIZED (Mo)    7851
     NUMBER OF VERTICES      54073 /   500000   CORNERS/REQ. 0 / 0
     NUMBER OF TRIANGLES     88548 /  1000000
  ** DBChaise.sol  NOT FOUND. USE DEFAULT METRIC.
  -- DATA READING COMPLETED.     0.285s
  -- MMGS, Release 5.3.6 (Apr. 10, 2017) 
     Copyright (c) IMB-LJLL, 2004-
     Nov 20 2017 20:57:19

  -- MMGS: INPUT DATA
  --  INPUT DATA COMPLETED.     0.000s

  &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
   MODULE MMGS: IMB-LJLL : 5.3.6 (Apr. 10, 2017)
  &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

  -- PHASE 1 : ANALYSIS
     Connected component: 1825,  genus: 6114,   reoriented: 0
     Edges: 154848,  tagged: 44052,  ridges: 44052, required: 0, refs: 0
  ## 9275 non manifold points detected
  ** DEFINING GEOMETRY
     20693 normals,  13949 tangents updated  (0 failed)

  -- MESH QUALITY   88548
     BEST   0.999992  AVRG.   0.688115  WRST.   0.000000 (5149)
     HISTOGRAMM:   79.55 % > 0.5
       0.8 < Q <   1.0     42379    47.86 %
       0.6 < Q <   0.8     18476    20.87 %
       0.4 < Q <   0.6     15109    17.06 %
       0.2 < Q <   0.4      7012     7.92 %
       0.0 < Q <   0.2      5572     6.29 %

  ## Error: _MMG5_minQualCheck: too bad quality for the worst element: (elt 5149 ->    0.000000e+00)
     NUMBER OF VERTICES      54073   CORNERS     9276
     NUMBER OF TRIANGLES     88548
     NUMBER OF EDGES         44052   RIDGES     44052

  -- WRITING DATA FILE DBChaiseRef.mesh
  %% DBChaiseRef.mesh OPENED
     NUMBER OF VERTICES      54073  CORNERS      9276
     NUMBER OF TRIANGLES     88548
     NUMBER OF EDGES         44052  RIDGES      44052
     NUMBER OF NORMALS       20693  TANGENTS    33380
  -- WRITING COMPLETED

   ELAPSED TIME  0.676s

Can you point me in the right direction to make this work? Thank you

Best regards,
Beni

#2

Sorry to have bothered you with this… In fact it was the mesh which was flawed. In meshlab I removed all duplicate faces and vertices and all non manifold edges (I don’t really know what that means…) and with the repaired mesh, it worked now.

Best regards,
Beni

#3

Hi Beni,
thank you for your messages, and sorry for getting back a little late to you.
Glad to hear that everything seems to work fine by now.
Do not hesitate to contact us for any further questions!
Cheers

#4