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>>290
> Lighting in most real scenes is complex, coming from a variety of sources
> including area lights and large continuous lighting distributions like skylight.
> But current graphics hardware only supports point or directional light sources.
> One reason is the lack of simple procedural formulas for general lighting distributions.
> Instead, an integration over the upper hemisphere must be done for each pixel.
> 
> We present such a simple formula for diffuse objects, i.e. for the irradiance.
> The key to our approach is the rapid computation of an analytic approximation to the
> irradiance environment map. For rendering, we demonstrate a simple procedural algorithm
> that runs at interactive frame rates, and is amenable to hardware implementation.
> No texture-mapping is required for the irradiance with our approach.
> 
> The main ingredient is the derivation of an analytic formula for the irradiance
> in terms of spherical harmonic coefficients of the lighting. For rendering,
> the key observation is that the Lambertian BRDF behaves sufficiently closely
> to a low-pass filter that we need consider only the first 2 orders of spherical harmonics,
> i.e. 9 parameters. The simple form of the first 9 spherical harmonics makes
> implementation straightforward.

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