[Bf-committers] Motion Blur

[Early Ehlinger]

Hi Sven,

I might be wrong, but I believe the reason it normally isn't done this way
is something like this.

Let's suppose we're going to do 4 renders per frame.  Then Frame 1 might use
T = 0.5 , 0.75 , 1.0 , 1.25 , and Frame 2 might use T = 1.5 , 1.75 , 2.0 ,
2.25.

As you can see, there's no overlap in the time domain between the two
frames.  If there were, the blurs would likely appear to "stutter" a bit,
which could be a neat effect if it's what you want, but probably would look
poor.

One thing I experimented with a while back was turning motion blur off,
changing my animation to produce slow motion (say 10x number of frames),
render it across my farm, then "speed it up" using ImageMagick to average
each set of 10 frames together.  The results were pretty cool, because the
renders were quick due to lack of Blender-provided motion blur, but still
blurry thanks to rendering 10x the number of frames.  If I recall, this was
the only way I could actually get motion blur with fluids, but I could be
mistaken.  It's been a long time since I tried it.

-- Early Ehlinger, President, ResPower, Inc.

On Jan 22, 2008 10:39 PM, Sven von Brand <svbrand at alumnos.inf.utfsm.cl>
wrote:

> Hi, I was rendering an animation with motion blur and I thought to
> myself y there was a faster way to do it, I understand that there are
> images made in between the frames to do the blur effect, but it always
> does the same amount of images. Now I was thinking, that, for example,
> if I have de mblur level in 5 and am rendering the 3rd frame, it could
> use the two frames made for the mblur of the 2nd frame and so saving
> 2 frames from the 2nd frame.
>
> It's this possible, or is there a reason why it isn't done this way?
>
> hope my question is well made...
>
> Greetings
>
>
> --
> Sven von Brand Laredo
> Estudiante de Ing. Civil Informatica, UTFSM
> Fedora Ambassador for Chile
> Coordinador Ciclo Charlas Tecnicas, DI, UTFSM
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