Mine

camera cam1
{
  pixeldim  640 480
  worlddim  8 6
  viewpoint 4 3 6
}

material green
{
   ambient 0  5 0
}

material yellow
{
   ambient  5  4 0
}

material purple
{
   ambient 4 0 7
}

material cyan
{
   ambient 1 5 7
}

plane rightwall
{
   material yellow
   normal -1 0 0.2
   point   7  0 0
}
material gray
{
   ambient 2 2 2
}
material red
{
   ambient 6 0 0
}


plane leftwall
{

   material green
   normal 1 0 0.2
   point  1 0 0

}


sphere left_sphere
{
   material cyan
   center  2   4   -4
   radius 2
}

sphere right_sphere
{
   material purple
   center  6   4   -4
   radius 2
}