Department of Control Engineering and Information Technology, TU of Budapest Budapest, M}uegyetem rkp. 11, H-1111, HUNGARY [email protected]

The paper presents analytically computable scenes for testing global illumination algorithms with arbitrary BRDFs. The task of these scenes is to enable us to compare global illumination algorithms and check the correctness of the implementation. In our rst approach a criterion is given that makes the radiance constant for an arbitrary closed scene allowing either arbitrary BRDFs or arbitrary lightsource models. In the second approach the geometry is assumed to be an internal surface of a sphere. Here homogeneous di use and mirror like re ections can be tested with arbitrary lightsource models.