[SOLVED] about explanation of components

[pun]

Hello,

I am new in SOFA. I do not have an advanced physics background. Hence I am trying to figure out which component to use. I am confused about “hexahedral fem force field” and “hexahedron fem force field”. What is the difference between these two? When should one use which? Also is there a more detailed descriptions of these components. I am aware of Component list explanations: https://www.sofa-framework.org/api/SOFA/sofa_modules_component_list.html
However there, components are explained in one sentence. In the documentation (https://hal.inria.fr/hal-00681539/document), I looked for “hexahedral fem force field” and “hexahedron fem force field”, however couldn’t find an exact correspondences.

[Hugo]

Hi @pungul,

That’s a good question: the semantic in SOFA was not always clear. SOFA dev teams are currently working on this.
To start with, both Hexa components are focusing on the simulation of linear elasticity in a topology based on linear hexahedra. at my best knowledge, the main difference between the two is that the hexahedral handles topological changes unlike the HexahedronFEMForceField.

About the physics, you could have a look at the videos tutorials, especially the step by step.

Let me know if it helps.
Best,

Hugo

[pun]

Hi,

Thanks for your immediate answer.
I am not sure if I understood correctly but by topological change do you mean change in number of vertices in mesh or edges etc.?

Bests

[Hugo]

Hi Pun,

Topological change means that elements of the topology does change: a vertice added, removed, a triangle added, removed or subdivided etc.

Cheers,

Hugo

[pun]

OK, thanks for the explanation!

[Author]

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