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    Photosimulation: Interreflection with Arbitrary Reflectance Models and Illumination
    (Blackwell Publishing Ltd and the Eurographics Association, 1989) Neumann, Laszlo; Neumann, Attila
    Methods for realistic image synthesis are described. Exact mathematical establishment of reflectance models is presented, together with the development of feasible reflectance models meeting the energy balance. A new bidirectional reflectance type, separable reflectance, is introduced. Necessary and sufficient conditions for the iterative solution of the linear equation system of interreflection are presented. Lastly, a new method of inserting numerically defined objects into real optical surroundings is described.