@piersyf : I did not quite talk about distance modifications between the mesh layers, I talked a distance of collision. This may allow to define different collision distances (with the collision objects). This already solves many problems of collision between close objects or close layers. It would indeed be possible to define a distance of collision between the different layers, but, for me, this is no longer collision functions but self-collision functions. We can think about it. With regard to wet hair, it is necessary to experiment.

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