Rendering equation

The rendering equation is the key academic/theoretical concept in rendering.

It serves as the most abstract formal expression of the non-perceptual aspect of rendering.

By connecting outward light to inward light, via an interaction point, this equation stands for the whole 'light transport' in a scene.

further information on: Rendering Equation

[1] (http://en.wikipedia.org/wiki/Rendering_equation) Wikipedia - Rendering Equation

[2] (http://portal.acm.org/citation.cfm?id=15902) ACM.org Portal- The Rendering Equation

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