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Hi, I do that almost every day... Its little bit tricky but works.. First you have to import the picture into your Bryce(take all the shadow options of from the background picture),locate the camera so that the edges cant be seen. Then I use normal Bryce ground for casting shadows. Then you can fix your background image so that it will turn transparent to the lower edge. ( this is a way to get rid of the stright edges of the picture) Pick a ground material as close as in the picture. Bring your 3d model and there u have it. Ask more if you have problems..