[SOLVED] How to use the component SparseLDLSolver?

[Wong]

Hello everyone,

I checked the SOFA_BUILD_METIS item in CMake to compile and use the SparseLDLSolver. But when I launch the FEMBAR-SparseLDLSolver.scn, the scene still cannot run properly and always output the message:”Failed to factorize, D(k,k) is zero”

So how to correctly use it?

Wong

[Hugo]

Hi @outtt

which version are you using ? 18.06 ?
This should be fixed in 18.12. I will gather more info about this issue with the devs.

Best

Hugo

[Wong]

Hello @hugo,

I just tested it in v18.12 and it is the same problem.

Thanks
Wong

[Hugo]

Hmm ok it means this might have been fixed in master since then
I’ll investigate and let you know.

Best

Hugo

[Damien Marchal]

Hello,

I compiled sofa master, with metis and SofaSparseSolver plugin and tried the scene.
It worked without problem on my ubuntu.
Can you gives us more details on your setup/OS so we can narrow the investigation ?

Damien.

[Wong]

Hello @damien-marchaluniv-lille1-fr

I use Sofa v18.12 on Win10 64bits. How do you configure your metis in CMake?

Wong

[Hugo]

Hi @outtt

Did you face any issue in the CMake configuration with METIS?
Like Damien, I successfully run the scene.

Hugo

[Wong]

Hello @damien-marchaluniv-lille1-fr and @hugo

I have solved the problem.
I think it is a bug on Windows.
In Visual Studio, such statement at SparseLDLSolverImpl.h, as is shown below, would be omitted in compilation process.

If I comment out //#include <metis.h> at SparseLDLSolverImpl.h, project SofaSparseSolver can still be built successfully.

So I make a line feed before that statement and then build. The scene can miraculously work! I do not know why.

Wong

[Damien Marchal]

Hello,

Thanks for the details.
To me this is a very strange behavior.

Some extra questions:
– which compiler version are you using ?
– did you installed metis yourself, would it be possible that there is a version mismatch between the library you link against and the sofa build ?

Damien

[Wong]

Hello @damien-marchaluniv-lille1-fr

My compiler is VS2015 and it is the built-in metis version in Sofa.

Wong

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