[SOLVED] Modeling suction force

[Mehdi]

Hi to all.
I’m using SOFA for about 6 months and this is my first post in the forum.

I want to model an external force-field (or interaction force-field) which applies to a volume mesh and sucks (or pushes) its neighbor elements while in range. The center of this force-field must be moveable by mapping it to and rigid object.

I have reached to following ideas which i could not implement:
– extracting the neighbor elements indices with BoxROI and map these elements to a child node (with SubsetMapping?) which has a special force-field (e.g. Ellipsoid with negative stiffness).
– Mixing several InteractionEllipsoidForecfield at a center-point that could result to a desired force field.

I would be thankful for your opinions.

[Hugo]

Hi Mehdi,

I am a bit confused, I’m not sure to get exactly what you would like to simulate. What kind of physical behavior do you want to simulate ?

If this is suction, I would use a TrianglePressureForceField on the surface of your object. This component has a parameter “triangleList” corresponding to the indices of triangles (separated with commas) where a pressure is applied. Using a BoxROI or a file storing the selected points, you can then give the indices to the Forcefield.

You can find an example here : examples/Components/forcefield/TrianglePressureForceField.scn

Hope that helps.

Hugo

[Mehdi]

Hi Hugo
Thank you for the reply. It really helped.

[Author]

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