V-Ray Maya shadow catcher

pompomstu

Hey guys. I`m trying to make a shadow catcher for use in a Maya scene. It`s an interior and the catcher works well but only when the roof has been hidden. If its not then the alpha becomes almost completely white. I`m really confused by this one so any help would be awesome.
Here is the scene

Eric Chadwick

Did you see this? 
https://forums.chaosgroup.com/forum/v-ray-for-maya-forums/v-ray-for-maya-problems/53362-shadow-catcher-setting-for-maya

pompomstu

Eric Chadwick said:

Did you see this? 
https://forums.chaosgroup.com/forum/v-ray-for-maya-forums/v-ray-for-maya-problems/53362-shadow-catcher-setting-for-maya

Thanks man, I think it was the GI giving a light glaze to the whole scene making all shadows appear in the alpha