@Kalosei : the first video was very slow. The reason is that I work sometimes with a development version. This version is not parallelized. I've remade the same simulation with a parallelized version, the dynamic deformation and the rotation work faster. Here is the link : https://drive.google.com/open?id=0B9c39Rz2Ec-JdTdIdlVXMk5EdDQ When you say that Optitex makes volumic simulations, could you give a link to an example made with Optitex. For me, a volumic simulation is a simulation made on a closed mesh filled by volumic elements. In the video that I sent you, the program uses a mesh made by triangles and this mesh is filled inside by tetrahedras. All the segments of these tetrahedras are springs so the mesh keeps its shape depending on the stiffness of these springs. I don't know if Optitex uses this method to make its volumic simulations.

There are several methods to keep to a mesh its initial shape. It is possible to create a node at the barycenter of the mesh and create springs between this barycenter and all the other nodes of the mesh. It is also possible to apply a force in the direction of the normal of each node. This solution is very simple to apply and don't take many time to be calculated (just a force to add to the node). This solution could be used to inflate a balloon for example. This is a inflate function but it allows too to keep the initial shape of mesh. This function could also be used for the pillow fight.

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