>> 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.

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