fix in demo to support new material system
fix in demo to support new material system

amelmquist/chrono,Milad-Rakhsha/chrono,armanpazouki/chrono,amelmquist/chrono,armanpazouki/chrono,amelmquist/chrono,Milad-Rakhsha/chrono,dariomangoni/chrono,rserban/chrono,armanpazouki/chrono,dariomangoni/chrono,projectchrono/chrono,rserban/chrono,rserban/chrono,projectchrono/chrono,amelmquist/chrono,armanpazouki/chrono,dariomangoni/chrono,projectchrono/chrono,rserban/chrono,dariomangoni/chrono,Milad-Rakhsha/chrono,Milad-Rakhsha/chrono,dariomangoni/chrono,projectchrono/chrono,rserban/chrono,amelmquist/chrono,rserban/chrono,armanpazouki/chrono,armanpazouki/chrono,Milad-Rakhsha/chrono,projectchrono/chrono,rserban/chrono,amelmquist/chrono,Milad-Rakhsha/chrono,projectchrono/chrono,dariomangoni/chrono