I don't know of a tutorial, but I played around with it for a few minutes and this is what I got. I don't know if it will be good enough for what you want, but this seems like it might be a good method: - create a height map for the pyramid in an image editing program using gradients. don't blur it or smooth it or anything. mine's kinda sloppy, which is why there's that weird shadow on the corner - save the image and import it into the bryce terrain editor at whatever resolution for the detail you want. - click subplateaus once or twice the material should probably be something kinda sandy looking, but you should look at pictures and play around until you get something that looks realistic. if you want you can duplicate the terrain, raise it slightly, reapply the original gradient image without the subplateaus and clip off the bottom with another terrain generated from the fractals so it has an uneven bottom edge to simulate the part at the top of the pyramid where the top layer hasn't been worn off by the sand. I didn't try that to see how it looks, though.