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The material used in the bottom of marine tanks is usually white, and comes out totally devoid of detail when you try to photograph it in a real tank. What I did was get 5 lbs of it, spread it out on my workbench, set up some flourescent lights, and photograph it from an angle. It took several weeks to get it to look halfway realistic. There's always room for improvement, but I'd be really interested if anyone has seen a better depiction of saltwater gravel in a program which pans all the way from one side of the screen to the other.
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