1. A system for propagating a model mesh based on a first mean model mesh and on a second mean model mesh, the system comprising: a registration unit computing a registration transformation for registering the model mesh with the first mean model mesh; a forward transformation unit transforming the model mesh into a registered model mesh using the registration transformation; a computation unit computing a propagation field for propagating the registered model mesh, the propagation field comprising vectors of displacements of vertices of the second mean model mesh relative to respective vertices of the first mean model mesh; a propagation unit transforming the registered model mesh into a propagated registered model mesh based on applying the vertex displacement vectors comprised in the propagation field to respective vertices of the registered model mesh; and an inverse transformation unit transforming the propagated registered model mesh into the propagated model mesh using the inverse of the registration transformation, thereby propagating the model mesh.