Modifyng liver example

[davide445]

Starting my SOFA testing trying to modify the liver example.

Created new version of the liver sim mesh with 40k tet liver.zip and just substituting into the mesh directory to the original one is getting loaded and working. I have some questions

• on my Ryzen 5 pc works at 3 fps but using I think a single thread. Wanted to ask if there is a way to enable multithreading to speedup things
• I suppose I will need to update also the collider mesh, where can I do this
• it's feasable just maintain the same sim setup and use SofaCUDA switching to GPU, or GPU sim need some specific chage in the used solvers
• how complicated is to test some cutting of the mesh

[alxbilger]

Hi,

I worked on a multithreaded version of HexahedronFEMForceField (https://github.com/sofa-framework/sofa/blob/master/applications/plugins/MultiThreading/src/MultiThreading/ParallelHexahedronFEMForceField.h). I wanted to do the same for tets, but never found the time.

In the liver scene, there are no collision mesh. If you added one on your own simulation, you can use any surface mesh matching the surface of your tets.

The force field TetrahedronFEMForceField is available in CUDA. See the example https://github.com/sofa-framework/sofa/blob/master/applications/plugins/SofaCUDA/examples/liver-CUDA.scn which is actually the liver scene setup with CUDA. On my laptop (NVIDIA RTX A3000), I have about 24 fps with your mesh.

If you start cutting, it will slow down your simulation for sure. I let someone else answer on how to cut a volume mesh.

[hugtalbot]

Is @alxbilger 's reply meeting all your questions, @davide445 ?

[davide445]

@hugtalbot sorry for not answering, got caught in other priorities this week and can return on the topic only next week at best.
Sure will need some more experimenting to better understand the topic.