[Bf-cycles] Noise patterns in animations

[David]

Hi,

currently the noise is initialized the same for every frame of an animation.  This leads to
visible "static" patterns for camera animations.  At the same time, in scenes with a static
camera, where only a little part of the scene is animated, the static noise pattern can be
beneficial for the appearance of the shot.  Therefore I propose making it an option to
initialize the RNG differently for each frame (defaulting to non-static noise, because it
behaves more like a film camera would).

Patch attached that implements this.

till then, David.

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