The constant radiosity assumption syndrome.

In Photorealistic Rendering in Computer Graphics (Proceedings of the Second Eurographics Workshop on Rendering), pages 83--92, New York, 1994. Springer-Verlag.

In progressive refinement the radiosity of the shooting patch is assumed to be constant. This is not correct. It is better to take into account the variation of the radiosity of the source. A progressive refinement method is given that takes into account the non uniform radiosity distribution of the shooting patch.