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An Efficient Representation for Irradiance Environment Maps

Finally, we discuss other applications of our representation. 3.1 Prefiltering For a given environment map, we first find the 9 lighting coeffi-cients, L lm for l ≤ 2, by integrating against the spherical harmonic basis functions. Each color channel is treated separately, so the co-efficients can be thought of as RGB values. L lm = Z π ...

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