[SOLVED] Issues using the FEMLiver example from GEOMAGIC plugin

[Anonymous]

I am trying to simulate haptic feedback on my models, but I am facing major issues.

I tried to use the FEMLiver example in the Geomagic plugin folder and replacing the liver.msh file path with a VTK model and making sure to use the VTK loader and other necessary modifications, but this makes sofa freeze. So, I tried with a Gmsh model and that always gave me a segfault.

I attached the files I am trying to load https://we.tl/t-Ew6GBkKfrk.

Best,
Fayad

[Hugo]

Hi @fayad

You actually faced two different issues with your two meshes. Let’s explain them one by one:

• by using your volumetric mesh (prostate): the start of SOFA takes time. It’s normal, since this scene is using a PrecomputedConstraintCorrection for the Lagrange constraints. This approach needs (before starting a simulation) to precompute the compliance matrix, as described here in the doc. And this can take (a lot of) time if your mesh is fine. If you want this initialization to be quicker (just to test the loading part) you can replace this PrecomputedConstraintCorrection by a UncoupledConstraintCorrection but collision will be less acurate (even potentially unstable if the compliance value is not suitable).
• the bunny is a surface, therefore the simulation does not work properly since a tetrahedral topology (volumetric) is expected. However, crashes are not the best way to help users 😉

Hope it helps.
Best

Hugo

[Anonymous]

Thanks Hugo, that makes more sense now :).

Fayad

[Author]

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