Hi, I posted this on the archviz forum but I want to share on the main forum as well. Attached are some images. One to show the overall scope of my project, one to address the problem I am having and my light-mass settings. The interior image shows the problem I am having. All the surfaces that face downward are dark. This is happening inside as well as on out side surfaces that face downward. It seams they are not getting any indirect lighting. Any ideas as why this is happening?