[SOLVED] Apply a force field on a MechanicalObject constructed by SubsetMultiMapping

[Ant0nin]

Hi guys,

I have MechanicalObject in my scene (its template type is Vec3) I fill using a SubsetMultiMapping. Thus, it is contructed using 2 subsets of 2 other MechanicalObjects. I now encounter an issue because I would like to apply a force field on the constructed MechanicalObject but it has no associated topology, and, as far as I know, a force field always needs a topology to works properly. So I planned to generate a topology from the MechanicalObject. I thought that a SparseGridTopology will do the trick but it seems that this one is intended to generate from an existing topology and not from a MechanicalObject. I’ve also noticed that an InteractionForceField may be an alternative solution to my goal.

What will be the best solution from your point of view?

I use SOFA 17.12.02 on Fedora 26

[Binesh]

Hi @ant0nin
I think that “InteractionEllipsoidForceField” is better solution for this problem because this component work with Mechanical Object and no need to topology

Best Wishes,
Behnam Binesh

[Ant0nin]

Thanks @Binesh for your suggestion ! Actually I solved my problem because I noticed that using a SubsetMultiMapping generate a topology which is not displayed in the graph. My force field was unable to find it in the first place but it was simply because I called its init() method before insering it in the hierarchy, which is incorrect (My MechanicalObject, SubsetMultiMapping and the force field are dynamically created when a contact between two objects occurs). Now my force field can apply on the generated MechanicalObject.

[Hugo]

Thanks anto0nin for sharing the final solution!
Looking forward to seeing your achievements!
Cheers,

Hugo

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