RE: Slightly OT: Post-motionblur with Nuke and XSI

["Sebastian Faber" <sebastian.faber(at)liga01.de>]

I checked it out with the mental ray motion vector pass. If you kill the blue channel (which indicates if an object is moving or not) it is identical to the lmv. The lmv is more compressed since  the max value of the motion can be adjusted in the render tree. Apart from that it is (as halfdan said in an other thread) identical to the lmv and can be used in reel smart or in nuke's vector blur node. The nuke vector blur generates some strange artefacts especially in the alpha channel which are very weird. It seems like a bug. So I think reelsmart is the right option.

 

 

Sebastian

 

 

Von: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] Im Auftrag von Arvid Björn
Gesendet: Sonntag, 11. Mai 2008 23:49
An: XSI(at)Softimage.COM
Betreff: Re: Slightly OT: Post-motionblur with Nuke and XSI

 

Nope, haven't tried that. Let me know if you find something =)

On Fri, May 9, 2008 at 5:08 PM, Sebastian Faber <sebastian.faber(at)liga01.de> wrote:

Yes thank you arvid. meanwhile Meanwhile I've got it too. Did you have any experience with the mental ray motion vectors and nuke. That's the next thing I want to test. T

 

 

 

Von: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] Im Auftrag von Arvid Björn
Gesendet: Freitag, 9. Mai 2008 16:40
An: XSI(at)Softimage.COM
Betreff: Re: Slightly OT: Post-motionblur with Nuke and XSI

 

I made it work with the standard tools, and it's quite near reelsmart but rsmb still looks a bit nicer. I also got some edge artifacts, some of which could be fixed with a tiny edgeblur of the beauty pass.

You have to set the vector-pass read node to "Raw",
then you have to use a Copy-node to copy rgb.red to forward.u, and rgb.green to forward.v,
then use the VectorBlur-node, set add u/v to -0.5 (to normalize), the multiply value to the value lmv shader reports (max displacement) and offset to -0.5, and method to forward.

Should work. =)

On Thu, May 8, 2008 at 2:27 PM, Sebastian Faber <sebastian.faber(at)liga01.de> wrote:

Hello everyone,

 

did anybody have success with post-motionblur using nuke? I know the Reelsmart-plugin for nuke works quite well. But is there a possibility to use standard nuke nodes and xsi motion-vector or lmv passes?

 

Thanks

 

Sebastian

 

 

--
senior 3d artist | stockholm.postproduction | www.stopp.se

--
senior 3d artist | stockholm.postproduction | www.stopp.se