| http://www.w3.org/ns/prov#value | - The method of claim 5, wherein said three perturbed normal components Nx', Ny', and Nz' approximate a perturbed normal in tangent space according to the following equations: ##EQU11## wherein coefficients a, b, c are given by: a=-k???u b=-(k???v) c=k2, where k is a constant and ???u and ???v are values in said height field. 7.
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