[Sidefx-houdini-list] Vector motion blur render pass query

Pablo Giménez pablogipi at gmail.com
Thu Mar 4 07:58:27 EST 2010


I believe there is a Motion Blur operator in Nuke, but I haven't use any
motion vectors from Houdini with it.
But I think it should be something is a very common task I think.

2010/3/3 Phil Spicer <PSpicer at bournemouth.ac.uk>

> Hi,
>
> Thank you so much for all your postings about this. My understanding of all
> things rsmb has increased a great deal over the past day or so. This last
> posting is especially welcome...
>
> We have found a free plugin for Shake that will accept this Render Pass. I
> will find out the link for it and post it to you. I am trying to identify a
> similar operator for Nuke if anyone has come across one.
>
> Kind regards,
>
> Phil.
>
>
>
>
>
> -----Original Message-----
> From: sidefx-houdini-list-bounces at sidefx.com [mailto:
> sidefx-houdini-list-bounces at sidefx.com] On Behalf Of steven ong
> Sent: 03 March 2010 19:17
> To: sidefx-houdini-list at sidefx.com
> Subject: Re: [Sidefx-houdini-list] Vector motion blur render pass query
>
> There's a forum thread on this and xtimmyx posted something to the Exchange
> too.
>
>
> http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=15521
>
> Cheers!
> steven
>
>
> > As Sebastian told you can get the velocity vectors and transform them
> > to Camera space using a space transform sop.
> > This works fine.
> > Also, more easy, you can setup a secondary pass and export the
> > velocity vectors from your surface shader.
> >
> > 2010/3/2 Sebastian H. Schmidt <sebastian.h.schmidt at googlemail.com>
> >
> >> the vop node getBlurP (vex function getblurP) is your friend ;) take
> >> the position at the beginning and end of a frame and calculate the
> >> velocity, to transfer something into camera space use the toNDC, or
> >> the transform VOP
> >>
> >>
> >> Seb
> >>
> >> On Tue, Mar 2, 2010 at 9:23 AM, Phil Spicer
> >> <PSpicer at bournemouth.ac.uk
> >> >wrote:
> >>
> >> > Hi,
> >> >
> >> > Is there any way output a motion velocity vector render pass for
> >> creating
> >> > motion blur in the composite? I have tried generating one using
> >> the Trail
> >> > SOP and re-ranging the velocity data to output as colour using the
> >> Point
> >> > SOP, and this works; however everything is in World Space rather
> >> than
> >> > relative to Camera Space. I am playing with VOPs as we speak...
> >> >
> >> > Any thoughts welcome...
> >> >
> >> > Kind regards,
> >> >
> >> > Phil.
> >> >
> >> > BU - the UK's Number One New University
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> >
> >
> > --
> > Un saludo
> > Best Regards
> > Pablo Giménez
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>
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-- 
Un saludo
Best Regards
Pablo Giménez



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