Originally posted by kbrown Enable decay regions on the light emitting the light fog and play with the settings... EDIT: Now that I think of it again, the decay regions might not work for this situation. Rendering in layers and compositing (kind of what you've already done) might be the only answer... Thanks kbrown! But... That would work if the stream of light was facing the normal of the panes of glass, but the light unfortunately has to be at an angle... So this would cause either overlapping of light on the glass (creating areas of white out) or having the beams of light start away from the surface of the glass enough to be noticable... And other possibilities? Hmm... maybe render layers?