vlight -clear
vlight -add ambient
vlight -add directional -dir -0.577 -0.577 -0.577 -head 1
-vlight -add directional -dir 0.577, 0.577, 0.577 -head 0
+vlight -add directional -dir 0.577 0.577 0.577 -head 0
vrenderparams -raytrace -raydepth 3 -shadows on -reflections -fsaa