| http://www.w3.org/ns/prov#value | - In a shadowing system, including a computer and a visual display, a method of shadowing an object in motion, the method comprising the steps of:simulating, and displaying on the visual display, an object in motion in a universe generated by the computer, wherein the universe includes a terrain defined by a set of planes which includes at least one plane which is non-parallel and non-orthogonal to
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