MV2Nuke v1.0

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Contributor: Diogo Girondi
Converts motion vector passes from different formats to suit Nuke's taste
5.1 or later
Linux, Mac, Windows
21 Jul 2010
Convert motion vectors from Mental Ray's raster motion, MIP shader, Raster Space, RE: ReelSmart Motion Blur and RE: SmoothKit to Nuke.
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0 # Rory Lowe 2010-08-03 09:31
Hi, Thanks for this Gizmo. Does it work with C4D Motion Vector passes, if it does which setting should I use?
If it doesn't is it possible to add it in, it would be a great feature as there is no other way of getting C4D vectors to work at the moment - that I know if anyway, I asked on a couple of forums, but no solutions so far. Cheers, Rory
0 # Diogo Girondi 2010-09-29 01:17
Hi Rory,

Can you send me or post a frame of C4D motion vector so I can take a look at it?
0 # Rory Lowe 2010-09-29 05:10
Thanks for that. Here is a link to 2 frames of C4D Motion Vector and RGB passes so you can make sense of them.
I've had a play around with them, and the information is obviously there I just have no idea how to get Nuke to understand it!
Hope the link works, let me know if you have any problems, I don't think I can upload files to this post.
Thanks again,
0 # Thomas Vanma 2010-12-11 11:22
thank you Diogo for this gizmo !
0 # Nirakar Sethy 2011-02-11 10:42
Thank You
0 # Rory Lowe 2011-02-11 11:13
Hi, Did anyone have any joy getting the motion vectors from C4D working?
0 # Mark M 2011-06-15 08:20
Hi Rory, not sure if this is too late. We've has success using C4D motion vectors using these settings:

In C4D set motion scale to 1.28 (instead of the default 128). This saves having to crank up the vector blur settings in Nuke to silly levels.

In nuke you need to replace the C4D motion pass' black background (if it has one) with a solid colour R 0.5 G 0.5 B 0 A 0 This is what Nuke sees as no movement.

Then shuffle copy the motion pass in as the depth channel of your render.
R --> U
G --> V

Use these settings for Vector Blur:

UV Channels: Motion

add u -0.5 v -0.5

multiply: use this to control the motion blur

offset 0

grow bbox 0

method: forward

There can be some odd artefacts but you can often get away with it.
0 # Rory Lowe 2011-06-15 08:33
Thanks for that, I've been looking for a solution to this for ages.
I can't at the moment but I'll test it out as soon as I guess the chance. Much appreciated.
0 # Rory Lowe 2011-06-30 17:06
Thanks again for that Mark, definitely some strange artefacts, but looks like it will work in some circumstances.
Very odd results with a test scene with 4 cubes moving in different directions, some it works well on some with artefacts and one it's not really working at all, very strange. I'll keep testing and see where I can get with it and hope Maxon bring out some decent Nuke export options!
0 # Mark M 2011-07-03 13:15
It definitely does some odd things at times, like leaving half an object without blur.
I agree about Maxon implementing some Nuke options. Camera and null export, multi layer exrs and point passes please.
0 # Sean Kalra 2014-06-24 23:23

I had a question regarding motion blur. I am working on a project in Maya with Vray and was compositing in after effects. I had a hard time in getting the RSMB to work with the velocity pass. I was wondering that is there any way I can make the velocity pass work with the RSMB or a way to convert it into the Mental Ray motion blur. I tried using MV2Nuke, but haven't got the results I was looking for. Please let me know if there is any way I can do it.

Thanks in Advance.


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