Further reading
The general idea of tracing light-carrying paths from light sources was first investigated by Arvo (1986), who stored light in texture maps on surfaces and rendered caustics. Heckbert (1990b) built on this approach to develop a general ray-tracing-based global illumination algorithm, and Pattanaik and Mudur (1995) developed an early particletracing technique. Christensen (2003) surveyed applications of adjoint functions and importance to solving the LTE and related problems.
Sources of non-symmetric scattering and their impact on bidirectional light transport algorithms were first identified by Veach (1996).
Pharr and Humphreys (2004) proposed the method to sample emitted rays from environment map light sources that is used in this ...
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