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elasticity simulation in polygon

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Hi fellows I want to add elasticity in my polygons. What I have to search? What mathematics laws, concepts or anything I need to search? Any help is welcomed Thanks for the support.

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In the simplest case of a triangle:

1) Find the Barycenter
2) Attach a fictitious spring from each of the three vertices to the Barycenter
3) Use Hooke's law to calculate the strain achieved by the stress applied

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tks... but I'll need to do this in a 3DS model. In this case, what can I do?? Do you have any resource for me?

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The beast which you are seeking is named "Soft body dynamics". Wikipedia has a less-than-good article on it, and there are tons of hits on Google.

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Thanks a lot for your help. I'll search this beast right now.
just one more question. To do all the things that I want, I'll do this:
- First of all, create the collision detection algorothm just to detect if a polygon touches the other;
- Second, create the hooke's law algorithm to provide the elasticity of my 3d model;

Am I forgot something?

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