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First, correct any perspective distortion. I use a grid (at 50% opacity) and try to get the bricks in horizontal rows. Remove anything you like with the rubber stamp tool. In this photo, I decided to make a lamp from bryce primitives, so I deleted it from the image, including its shadow! Then, make a grayscale image of identical size and adjust levels so that grayscales represent height. Plan to set the opacity slider in bryce such that black becomes transparent, for any window or door openings.