Discretizes the scene into patches and solves a linear system of form factors for diffuse interreflection. View-independent, so the solution can be walked through in real time, but it cannot represent specular transport.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
Colour is the family; a dashed line is the second member of it.
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specializesis a specific case of The Rendering Equationsolves the diffuse-only case as a linear system
alternative-tois a competing approach to Path Tracingview-independent solve instead of per-pixel sampling
Referenced by
approximatesLightmaps is a cheaper stand-in for thisbakes the converged solution into textures
References
Modeling the Interaction of Light Between Diffuse Surfaces — Goral, Torrance, Greenberg, Battaile — 1984 · link