Hi all, I set up this image with the background being the Prop square translated in the negative z-direction to be behind the subject, and then scaled to 2000% so that the background would fill the entire portrait. When I rendered it, I got the weird pattern on the background. I had not applied any material settings apart from the plain vanilla white setting that comes with the square prop. Can someone please tell me what is going on here, and how I can fix this problem ? thanks and regards, Andrew