POV beta 9

-In section 2.6.2 the second paragraph says: "Photon mapping is a technique
which uses a backwards ray-tracing pre-processing step to render refractive
and reflective caustics realistically..." but in my opinion the photon
mapping tecnique can be considered a forward ray-tracing pre-processing step
not backwards.
Could Nathan Kopp confirm this?

-The triangle texture and variable reflection are listed both in section
2.6.12 and 2.6.8

- The media speed enhancements are listed both in section 2.6.13 and 2.6.9

Alessandro

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