Abstract
Ray tracing is one of the most powerful techniques used in computer graphics. Although ray tracing techniques can take into account the effects of reflection from neighbouring surfaces, it has hitherto been impossible to completely account for the ambient or global illumination arising out of complex interreflections in an environment because of limitations of the number of rays that could be fired to render the scene in a span of time reasonable from the point of view of practical use. In this paper, a fast method based on positive and conventional (reverse) ray tracing techniques to take into account the complex interreflections in a scene is proposed. While the directionality of the illumination intensity from the secondary sources are not taken into account the description is viewer independent. Unlike the radiosity approach the present method can treat open systems since no limitations due to conservation of energy is imposed. The method is efficient and computationally inexpensive.
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