Global Illumination

Feb 10, 2026

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This collection of images illustrates the principles of radiosity using the Cornell Box model. Radiosity is analyzed through parameters including emitted energy (Ei), reflectivity (Ri), and the energy transfer between patches (BjFjidAj). The integration of the environment's energy flow to each patch (j) is depicted, along with the view factor (Fij) defining radiation interactions. The exploration simplifies complex light interactions like caustics, reflections, and subsurface scattering, highlighting the importance of these principles in architectural rendering and visualization.

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Global Illumination

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Global Illumination Collected Images D. House 11/24/09
Radiosity
The Cornell Box
Where: Bi is the radiosity of patch I, Ei is emitted energy, Ri is the reflectivity of the patch. • All j (j != i) in the rendered environment are integrated for BjFjidAj, to determine the energy leaving each patch j that arrives at patch i. • Fij is the constant-valued view factor for the radiation leaving i and hitting patch j. • The reciprocity: • For ease of use the integral is replaced and uniform radiosity is assumed over the patch:
Radiosity for Architectural Rendering
Photon Mapping