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引用切替：ﾚｽｱﾝｶｰのみ

>>253
> We consider the rendering of diffuse objects under distant illumination,
> as specified by an environment map.
> Using an analytic expression for the irradiance in terms of
> spherical harmonic coefficients of the lighting,
> we show that one needs to compute and use only 9 coefficients,
> corresponding to the lowest-frequency modes of the illumination,
> in order to achieve average errors of only 1%.
> In other words, the irradiance is insensitive to high frequencies in the lighting,
> and is well approximated using only 9 parameters.
> In fact, we show that the irradiance can be procedurally represented simply
> as a quadratic polynomial in the cartesian components of the surface normal,
> and give explicit formulae. These observations lead to
> a simple and efficient procedural rendering algorithm amenable to hardware implementation,
> a prefiltering method up to three orders of magnitude faster than previous techniques,
> and new representations for lighting design and image-based rendering.
>

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