[Sidefx-houdini-list] motion blur

zoran arizanovic zoran.arizanovic at gmail.com
Mon Aug 21 09:37:31 EDT 2006


uf didnt know that!
thank you
regards
Zoran

On 8/21/06, Jeff Wagner <jeff at sidefx.com> wrote:
>
> Just in case...
>
> If you are using expressions, make absolutely sure you are using $FF or
> $T in place of $F (which returns the integer frame value).
>
>         The shutter speed at 0.5 will evaluate $F incorrectly to a whole
>         frame number of the previous frame.
>         The shutter speed at 0.5 will evaluate $FF correctly at the
>         integer x.5 value.
>
>
> e.g.:
> $F = 10
> Shutter = 0.5
> Start Frame Motion Blur = 9.5
> End Frame Motion Blur   = 10
> Start Frame- Expression using $F evaluates to  =  9
> End Frame-   Expression using $F evaluates to  = 10
>     INCORRECT MOTION BLUR!
> Start Frame- Expression using $FF evaluates to =  9.5
> End Frame-   Expression using $FF evaluates to = 10
>     CORRECT MOTION BLUR
>
> e.g.:
> $F = 10
> Shutter = 0.4
> Start Frame Motion Blur = 9.6
> End Frame Motion Blur   = 10
> Start Frame- Expression using $F evaluates to  = 10
> End Frame-   Expression using $F evaluates to  = 10
>     NO MOTION BLUR!
> Start Frame- Expression using $FF evaluates to =  9.6
> End Frame-   Expression using $F evalutates to = 10
>     CORRECT MOTION BLUR
>
>
> -jeff
>
> On Mon, 2006-21-08 at 14:39 +0300, hoknamahn at cgtalk.ru wrote:
>
> > Check the Shutter Speed parameter of camera obj.
> >
> > zoran arizanovic wrote:
> >
> > > Hi
> > > how can I crank up motion blur even for slow moving/deforming objects
> > > I have it enabled in mantra and on camera
> > > but still cant see it?
> > >
> >
> > _______________________________________________
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>
> --
> Jeff Wagner, jeff at sidefx.com, Senior Technology Consultant
> Side Effects Software, www.sidefx.com, Toronto, Ontario, M5V 3E7
> tel: (416) 504-9876, fax: (416) 504-6648
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>



-- 
Zoran Arizanovic
http://arizanovic.blogspot.com/



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