The Stiffening by extension generates springs along the surface of the mesh. The value defined in the interface corresponds to the number of times the extension is done on the mesh for each vertex. This stiffening corresponds to the global stiffness of the clothe.

The stiffening by neighborhood generates springs around each vertex defined by a sphere. The value defined in the interface corresponds to the radius of this sphere. This stiffening allows to tie parts of the mesh which are in independent elements (not linked by the structure of the mesh). This allows to attach the buttons on the outfit.

For both stiffening methods, There is another value corresponding to the softness of the springs.

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