- don't use frameUniform.time as the temporal noise seed because
this has a cycle to it. It's not very visible on dithering but
obvious when used for other things.
- don't use fract(time) since time was already in [0,1] -- though it's
moot now.
- instead of time pass a random number in [0,1] generated on the CPU
each frame.
This will also allow to control temporal noise more easily if
needed in the future (e.g. for accessibility or rendering tests)
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