### Adding a new sphere (Tut02.rt)

You must only add two section. One material, one object.

You can use copy and paste for file Tut01.rt. Copy the last two section and paste then in the end of file, before the dot ( "." ). Change the name of material and the object, and change the sphere position. Change the name attribute of the last two sections; subst "name mat1;" with "name mat2;" and "name sph1;" with "name sph2;" so RT can distinguish them. Then you must move the last object, because it occupies the same space of object sp1 and you will see only one. Move it up, changing the coordinates of the center. You can see this transformation in file tut02.rt.