| http://www.w3.org/ns/prov#value | - where Nx'OS, Ny'OS, and Nz'OS are the three component texture values in the perturbed normal N'OS texture map calculated in step 920, HOSx, HOSy, and HOSz are the x, y, and z components respectively of object space half angle vector HOS, and n is an integer representing the specular power.
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