Hi,
when data for photons and/or media can NOT be safle loaded ?
I ques that camera moving/rotation is alwys safe, and any other changes is 
scene (objects or lights) is not safe - is this correct ?

Probably moving object that do not interact with photons is safe, but what 
if that object are in path beetwen two interacting object (and should block 
photons) ?

Moving lights that do not interact with fotons is alsow sefe ?

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