mental ray motion vectors to blur in Nuke

Become a member of the CGSociety

Connect, Share, and Learn with our Large Growing CG Art Community. It's Free!

THREAD CLOSED
 
Thread Tools Search this Thread Display Modes
Old 07 July 2010   #1
mental ray motion vectors to blur in Nuke

I have been searching online for tips on how to do motion blur in post from elements rendered with Mental Ray. I have yet to find a good explanation on what to do in Nuke, what kind of motion vector will work from Mental Ray. Has anyone gotten a good result that they used in production?

I am having difficulty figuring out what the node graph setup would be in Nuke. Some say that what is needed is a vector blur node, others say you ALSO need a motion blur 2D node... I just don't know any more... I am also reading about needing to plug in expressions to offset the values for u and v channels, but I am not sure how to do that, either....

Any help would be great!
 
Old 07 July 2010   #2
Lightbulb



this image was composited in Nuke...

first .. in maya .. i made motion vector pass with
((puppet shader - motion to RGB shader)) ... it will give
you a perfect effect...

then inside nuke make this tree



plug the MV pass as (input 1) in shuffleCopy thin ..in "forward channel" as U, V channels
and plug the default color stream in (input 2) as (RGBA)

and in the vector blur node ... just select the channel "forward" because in the
shuffle we plugged the motion vector pass as forward ((U, V))..
and begin playing in values to choose the right values to the Mblur


i hope this could help you
__________________
Hazem M. Sabry
VFX Artist
MBC Creative Service
=================
www.hmsabryworks.com
 
Old 02 February 2011   #3
Wow I just saw this...
thanks for posting it. I don't usually like to use the puppet shaders, but I'll give this a look!
 
Old 02 February 2011   #4
Thread automatically closed

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.
__________________
CGTalk Policy/Legalities
Note that as CGTalk Members, you agree to the terms and conditions of using this website.
 
Thread Closed share thread



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
CGSociety
Society of Digital Artists
www.cgsociety.org

Powered by vBulletin
Copyright 2000 - 2006,
Jelsoft Enterprises Ltd.
Minimize Ads
Forum Jump
Miscellaneous

All times are GMT. The time now is 04:51 AM.


Powered by vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.