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Light scattering<br />
Increased radiance due to in-scattering:<br />
(⃗ω · ∇)L(x, ⃗ω) = σ s (x) ∫ Ω4π p(x, ⃗ω′, ⃗ω)L i(x, ⃗ω′)d⃗ω′<br />
integrate over all directions on a sphere<br />
(surface area)<br />
Increased radiance due to emission:<br />
(⃗ω · ∇)L(x, ⃗ω) = σ a (x)L e (x, ⃗ω)
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