Ok, I was trying to experiement with volumetric lighting.  I had one spot light (the one with the effect) and an infinate one pointing back.  There were two one sided squares for the floor and the back wall.  As you can see, there seems to be an echoed shadow across the floor.

Anyone know what is causing that?

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)