Documentation Talk:Reference Section 3.2

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"An object can have both radiosity and an ambient term. However, it is suggested that if you use radiosity in a scene, you either set ambient_light to 0 in global_settings, or use ambient 0 in each object's finish. This lighting model is much more realistic, and POV-Ray will not try to adjust the overall brightness of the radiosity to match the ambient level specified by the user."

This is no longer true as of version 3.7.0 beta 38, as it automatically forces ambient_light to 0 in radiosity scenes (or, more true to the inner workings, pretends that the user had set it to 0), providing a dedicated mechanism instead for modelling glowing objects (emission).

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