Documentation Talk:Reference Section 6.1
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Regarding the note at the end of http://wiki.povray.org/content/Documentation:Reference_Section_6#Media
The casting of a shadow depend on the kind of media concerned.
Absorbing media always cast a shadow.
Scattering media also cast a shadow unless it's extinction is set to zero.
Emissive media never cast shadow.
I would suggest reordering the 3 sampling methods descriptions.
Start with method 3.
Then, put the warning followed by methods 1 and 2.