Grainy Render only in specific scene

markmartinc

I've been using Daz for about two months and love it.  But I am having an issue with one particular piece and it only happens occasionally.  Ive made some renders using http://www.daz3d.com/i13-stylish-room-and-poses.  I don't have any problem using 3Delight, but I sometimes get grainy renders with IRay.  I only experience these issues when I use this room.  I've tried to troublshoot it by changing how many figures I have in the scene but it doesn't seem to matter.  I have render with eight characters and it's fine, but have rendered with two and it's grainy.  I've take those same eight characters and placed them in another room and no grain.  Could it be the lighting within this scene?  Any help would be greatly appreciated.

Richard Haseltine

Yes, it is probably lighting - judging by the views out of the windows I suspect there is a dome or panorama surrounding the set which will be blocking the environment light, leaving you with whatever light can bounce past the dome and any local lights you have added - that means Iray will be wasting a lot of time on light that isn't doing anything useful, and will certainly be working with reduce light in the scene (especailly as having got past the dome it then has only small windows to get in through). If you can, try hiding or deleting the element with the outside view of the mountains.