Comments on: How to Add Motion Blur to your 3D Animation in Post Production by Creating 2D Motion Vectors in Maya

By: Nick Guth

Nick Guth — Thu, 17 Jun 2010 22:03:18 +0000

If you’re having trouble I wrote a document that clearly examples how to use maya and nuke for post motion blur. You can view it on vfxtalk.com or at this link http://www.vfxtalk.com/forum/attachment.php?attachmentid=9558&d=1270799307

But I agree with Jake, you’re probably not viewing your mv channel. Make sure you’re not viewing RGBA!

By: Jake

Jake — Thu, 17 Jun 2010 15:00:57 +0000

you are probably not viewing the XYZ motion vector layers of the exr in your compositing software?

By: Vivek

Vivek — Tue, 08 Jun 2010 19:04:41 +0000

Hi I followed the tutorial, but the render turns out black. empty? could you please give me some insight

By: Adam

Adam — Mon, 29 Mar 2010 15:54:54 +0000

I’ve been setting the Motion Offsets/ Motion Back Offset to 0.0001 and only setting motion blur for the vector pass.

By: Nick Guth

Nick Guth — Sat, 20 Mar 2010 12:07:25 +0000

Great information. I wasn’t able to follow the tutorial step by step since a lot of it didn’t pertain to my scene, but I learned from it!

I have figured out a fairly easy approach to motion vectors out of maya 2010 and into nuke. I am still testing it, but I wanted to know what people think. I’ll try to create a pdf of it as a tutorial/guide if people are interested?

Basically I’m using the ‘multiply’ knob inside of the vectorBlur node to control the amount of motion blur. Mine happens to use 750 as the value, which looks good. It might be because I am using a 2k render though. Would the resolution affect the multiply value? It seems rather high, but the results look good!

Cheers.

By: Martin

Martin — Wed, 03 Mar 2010 12:02:30 +0000

I’m having a ton of trouble getting my EXRs into After Effects.

I’m outputting RGBA(Float) 4×32 Bit EXRs with the framebuffer setting as specified in your other page, but when I get them into after effects the 2D pass is black & EXtractoR says ‘No auxiliary cannels available’. It says the same thing on the (functioning) beauty pass too.

I have the Preserve RGB checkbox on & everything else I can think of! Amazing Tut BTW.

By: braam

braam — Mon, 01 Feb 2010 11:40:47 +0000

Hi Jake and everyone,

Any luck with the temporal motion blur problem between Maya and After Effects?

We really don’t need time penalty for any of other passes! Especially for the Ambient Occlusion and Reflection passes. It is still not lined up 100% in After Effects.

Regards,
Braam

By: Matt

Matt — Sun, 31 Jan 2010 16:34:00 +0000

Hey,
thx for the comparison . . .

the maya built-in motionVectorPass produces temporal parity – even with a small displ.Value (0.00001).
so you are forced to apply the same amount of motionBlur to all your other passes – right!?!

I tested a large scene with motionBlur on set to 0.00001 . . . and it’s about 10% slower than without .. . . that’s not good (wait)

hope there are any ways out?!
best regards matt

By: 110 The Ultimate Collection Of Maya 3D and 3D Max Tutorials | Tutorials Palace

Fri, 29 Jan 2010 19:25:31 +0000

[...] Motion Blur Add motion blur to your 3D animation in post-production by creating 2-D motion vectors in Maya. [...]

By: Jake

Jake — Sat, 23 Jan 2010 18:47:14 +0000

Hi Monika,
Yes, you have to set up your precomps just right if you are using after effects.
Having a moving camera doesn’t work really well with this method of motion blur in my experience, and I think at least with the lm2dmv shader it just doesn’t generate correct blur data. Thanks for your feedback.