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This would be a response to why is it possible to use the Fresnel equations in an RGB path tracer. Though evaluating Fresnel equation directly requires some what more information about the environment in which the rendering takes place, it certainly is possible to use it in an RGB path tracer. Here is why: TLDR: see last two paragraphs. The goal of Fresnel ...


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This is almost verbatim from Veach. Let the trajectory space be $\mathbb{P} = \mathbb{R} \times \mathcal{M} \times \mathcal{S}^2 \times \mathbb{R}^+$, corresponding respectively to: time, set of points of all scene surfaces, unit sphere (directions), wavelength. Let $\mathcal{P}$ be the set of measurable subsets of $\mathbb{P}$ and we have a measure $\rho$. ...


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