Vray velocity pass and Reelsmart

[Steve Davy]

Does anyone know what the correct settings are for a Vray velocity pass in render elements when comping with Reelsmart Vectors in After Effects?

[Pierre Jasmin]

See third item here: (there is a sample scene - project)
http://revisionfx.com/support/faqs/motion_vector_faqs/motion_vectors/#Maya
- actually we are redoing this right now

Short form:
Don't check Clamp Velocity
You can use Max Velocity of 1.0 if you like (but from there you are forced to work in floating point in project settings of AE) - this corresponds ot the Max Displacement value in RSMB + Vectors, so if you intend to work in 16 bpc, type in there the image width for example
And you do need an alpha channel for MV, if you export via multi-channel EXR, you will need post eXtractor to put back the alpha (extract + Trck Mask layer above with Alpha)

Piere

On 3/6/2015 10:37 AM, Steve Davy wrote:

Does anyone know what the correct settings are for a Vray velocity pass in render elements when comping with Reelsmart Vectors in After Effects?

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[Steve Davy]

Hi Pierre,

Thanks for the quick reply.

So I think you're saying the Max Velocity value is the same as the Normalize attribute on the lm2DMV shader for mental ray, is that right? So setting this to the X resolution of your image guarantees that nothing in the frame can be moving faster than this value?

And, it's still necessary to set up camera attributes the same way?

That is, camera shutter angle should be 180.
Shutter Open and Shutter Closed to a small value such as 0.00001

And, unfiltered/unantialiased?

That right?

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Date: Fri, 6 Mar 2015 10:47:44 -0800
From: jas...@revisionfx.com
To: maya...@googlegroups.com
Subject: Re: [maya_he3d] Vray velocity pass and Reelsmart

[Pierre Jasmin]

On 3/6/2015 10:58 AM, Steve Davy wrote:

Hi Pierre,

Thanks for the quick reply.

So I think you're saying the Max Velocity value is the same as the Normalize attribute on the lm2DMV shader for mental ray, is that right? So setting this to the X resolution of your image guarantees that nothing in the frame can be moving faster than this value?

Yes

And, it's still necessary to set up camera attributes the same way?

That is, camera shutter angle should be 180.
Shutter Open and Shutter Closed to a small value such as 0.00001

I think this is now fixed in Maya. Can you tell me if not?  In Max with V-RAY (what we just finished before moving to Maya) this has no effect.

And, unfiltered/unantialiased?

For motion blur, just the anti-aliased alpha should be enough
(UV is bit more capricious)