Topology Exception reading binary STL files about pmp-library HOT 8 CLOSED

Hi Frédéric,

The exception already tells you what's wrong with the mesh you are trying to load: It contains a complex (non-manifold) edge. PMP only supports 2-manifold meshes. The other tools you mention just load an arbitrary triangle soup, not a well-connected mesh. Your best option probably would be to try to fix the non-manifold edges in another tool or to make sure the meshes you generate are 2-manifold.

Hope this helps.

from pmp-library.

So I guess the best (not the easiest) solution is to fix my mesh generation...
Thanks for answering

from pmp-library.

Fixing the source of the issue is certainly a good idea.

We might also change the behavior of add_face() to ignore such configurations in the future. Keeping this open as a question / reminder.

from pmp-library.

BTW, I have the same issue, is there anyway to fix the "Complex mesh"?

from pmp-library.

Thank you very much !

from pmp-library.

Wow, that looks like a lot of non-manifold faces! Run-time must be pretty bad though due to all the exceptions being thrown. However, for the moment that was the minimally invasive change that does not change the API.

Would you mind sharing one of those meshes? Would be a nice case for benchmarking.

from pmp-library.

Sure.

https://drive.google.com/file/d/1EhtwiregeWaK5MzniIQB_pQRCq0Rrqxg/view?usp=sharing

I have lighter versions of these somewhere but I need to find or regenerate them...

The process is very simple:

• I use a custom program to generate a huge triangle soup with marching tetrahedra or cubes of the fractal scalar field.
• then I decimate this soup (maybe 30 Gigs) using a very clever out-of-core decimating program that I only have the Linux 32 bit executable for (it was given by a student maybe 20 years ago, can find his name but never hear of him since)
• I then convert to STL the result which can be handled as you can see.

The step where all topology errors are introduced is the polygonization I think, I am not a specialist and my code is very old.
I can share it also if you want.

from pmp-library.

Update : I found a much smaller file

https://drive.google.com/file/d/12bQb5UsA3ltwjI027vC1UR7y2LFCw-ev/view?usp=sharing

I also was able to find the decimation program:

cluspartred <OPTIONS> filename [filename, ...]
     (c) 2002,2003 by Heiko Lippmann
  OPTIONS:
    -v                                   print version
    -q                                   be quiet (no verbose output)
    -e <double>                          maximum mesh error (> 0.0)
    -p <double>                          mesh inversion penalty (> 1.0)
    -a <double>                          compactness ratio (> 0.0 && <= 1.0)
    -c <integer>                         grid size n for 2^n cells (n >= 1)
    -f <integer>                         grid shift factor (>= 0.6) use with care!
    -t <filename>                        base filename for temporary files
    -r <filename>                        base filename for reduced files
    -i                                   delete input file after processing
    -m                                   delete temporary files after processing
    -s <integer>                         maximum partition size
    -b <xmin xmax ymin ymax zmin zmax>   bounding box
Missing arguments.
Cluspartred version 0.1

from pmp-library.