camera cam1 { pixeldim 640 480 worlddim 8 6 viewpoint 4 4 4 } material white { diffuse 5 5 5 ambient 2 2 2 } material green { diffuse 0 5 0 ambient 0 2 0 } material yellow { diffuse 5 5 0 ambient 0 0 12 } plane floor { material white normal 0 1 0 point 0 0 0 } fplane ceiling { material yellow normal 0 -1 1 point 1 3 -6 xdir 1 0 0 dimensions 6 3 } light center_red { location 4 8 -2 emissivity 5 1 1 } light left_blue { location 2 8 0 emissivity 1 1 5 } light right_green { location 6 8 0 emissivity 1 5 1 }