Great effect Daniel! Thanks for taking the time to explain it. It will work great in other maps that I do.

I'll play around with it a bit to see if I can adapt it to this one as well.

In this map the light source isn't casting light from the top of the stairs downward so the shadow won't fall on the next lower step. Because the light source is at ground level, the exact opposite will occur with a variance in shadow length based on elevation.

I chose to use direct lighting for this render and now I''m beginning to regret that decision.