//  An empty scene
//  Last edited on 1999-02-10 18:50:50 by stolfi

//  Defines 
//    scene
//    overlay

#declare scene = sphere { <0,0,0>, 0 } 

#declare overlay = sphere { <0,0,0>, 0 } 

#declare overlay_height = ;
#declare overlay_width = ;
#declare overlay_rel_dist = 0.;