Anybody have a good formula for how big an image needs to be when placed as a "background" to look correctly when rendered and not just used as a reflection map. What I am doing is placing a panorama that has been rendered in Byrce/Terragen in the "background" so I can move the camera around in Carrara (animate) and have it look seamless and like a real terrain as I follow a walking model around. Just curious if anyone had a magic number as to how big the image should be, or does it depend on your final output. If so, (I know the image should have an aspect ratio of 2:1) what's the ratio between the background and the final output. Thanks for any help you can provide. Chuck