//以下為知難行易的第三個材質的部分程式(粗燥的表面)
//     Four chinese words KNOW

surf {
           bump {
                   turb {
                           scale .5 .5 .5
                           amp .8
                           terms 1.6
                         }
                 }
             diff gold spec .7 .7 .7 shine 40
       }
//========================================================