file:///usr/local/src/povray-3.50c/doc/html/povdoc_033.html

'Photon mapping is a technique which uses a backwards ray-tracing 
pre-processing step' -- doesn't this mean a forwards light-path 
tracing? A new user would not be aware that standard raytracing 
traces the light path backwards from object to light source, and 
that what you mean here is that you are tracing 'backwards' with 
respect to this 'normal' path .. ie forwards with respect to how 
the standard physical model of light works.

Simeon

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