Lecture 13: Global Illumination & Path Tracing (21)
zhangyifei-chelsea

The interpretation of this formula is: Given a fix surface point and an outgoing direction, the outgoing radiance equals to the integral of BRDF times incoming irradiance over the entire hemisphere.

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It's noticiable that how we calculate radience in the reflected direction is similar to how we derive the irradiance at a particular point. E(p) equals to the integral of incoming radiance over the entire the hemisphere. Here we plug in a BRDF term to scale incoming radiance over all directions to derive the reflected rediance.

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