Here's a simple example. Render a few frames of this (e.g. +kfi0 +kff20)

//---start of code
#default { pigment { rgb 1 } finish { diffuse .8 emission .2 } }
background { rgb z }
plane { y, -1 pigment { checker rgb 1, rgb .8 } }
light_source { <-2,3,-1>, rgb 1 }

#declare T = frame_number/final_frame;

box { -1,1 translate x*(1-2*T) pigment { rgb x } }

camera {
 right x*image_width/image_height
 up y
 direction z*.8

 location <-1.5,.5,-3>+x*T
 look_at x*T

 aperture 0.5
 focal_point 0
 blur_samples 4
}
//---end of code

Notice how the noise is completely static. If I had the option to make the noise
different on every frame I'd get a much more visually pleasing result. It's
worth noting that I'm planning to blend multiple frames to get motion blur, so I
was hoping that blending would improve the focal blur too. Though in any case
static noise draws attention to itself far more than if it was moving.


Le_Forgeron <lef### [at] freefr> wrote:
> Le 10/11/2010 14:42, Tek a écrit :
> > It seems like the "random" samples for focal blur are now the same on every
> > frame of an animation. Is there any way to randomize it per frame?
>
> Can we have a demo setting to try to reproduce it ?
> (with a minimal scene, please)
>
> >
> > I don't mind a bit of noise but if it's not moving it looks like I'm viewing the
> > scene through a distorted pane of glass. I'm pretty sure it didn't used to have
> > this problem (though admittedly I don't often use blur in animations).
>
>
> --
> A good Manager will take you
> through the forest, no mater what.
> A Leader will take time to climb on a
> Tree and say 'This is the wrong forest'.

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