Change related to the VIPER demo on SPH terrain
Change related to the VIPER demo on SPH terrain

projectchrono/chrono,dariomangoni/chrono,dariomangoni/chrono,rserban/chrono,rserban/chrono,dariomangoni/chrono,dariomangoni/chrono,projectchrono/chrono,projectchrono/chrono,rserban/chrono,rserban/chrono,rserban/chrono,rserban/chrono,dariomangoni/chrono,rserban/chrono,projectchrono/chrono,projectchrono/chrono,dariomangoni/chrono,projectchrono/chrono