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Radiosity spotlights?

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Hi, i was wondering whether it´s possible to integrate spot lights in the radiosity equation. i searched all the web, but i have not yet found an article which discusses this topic. so i have experimented myself and have just replaced the nominator part of the form factor calculation with phi_i * phi_j * spotfactor, where spotfactor is the spotlight equation. It seems to work well, but i don´t know this is accurate and the correct way. Any comments, suggestions and ideas would be appreciated :) thanks gamma_strahler

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