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

steven ong steve_nong at pointy.tv
Wed Mar 3 14:16:45 EST 2010


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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