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>>> I found under some conditions you get a visible pattern to the noise
>>> when doing a low quality "preview" render with no_cache. It's almost as
>>> if the random number generator is seeded off the pixel coordinate or
>>> something? Is this possible or am I seeing patterns where none exist?
>>>
>>
>> A simple way to check that: Launch a 2 or 3 frames animation with no
>> changes between the frames.
>> If there is a repeatable pattern, the images will show the same pattern.
>> If the pattern is just random noise, it will change from frame to frame.
>
> OK it's the same every frame, I'll post an image in p.b.i.
Actually I just realised this has an implication, that you can't render
N times on one machine (or I assume on N machines) and then average the
result. Should there be a way to set the RNG seed that is used for
choosing the direction to shoot rays?
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