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

Pablo Giménez pablogipi at gmail.com
Tue Mar 2 13:21:47 EST 2010


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.
> >
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-- 
Un saludo
Best Regards
Pablo Giménez



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