a motion blur map in Vray ?

[gregg3d]

Can we do with Vray a motion blur map like the one discribed on this page ?

http://www.alamaison.fr/3d/lm_2DMV/lm_2DMV.htm



GREGG
- Web : http://www.cg3d.org/ -

[plastic_]

yeah but it's kind of useless because it doesn't work with RSMB.
at least that was the case a few months ago.

[Trapezium]

If you're using Combustion you can enable the Object Velocity G-Buffer and save to RPF.

--Jon

[gregg3d]

I only have a Shake 2.51 licence to add motion blur on my Vray renders.
And this way could be the only one, that's why i'd like to know how could i export that kind of informations.

RPF motion blur works on combustion but not in Shake 2.51, and RSMB works only with Shake 3.0 and more.

By the way i've found this script for Shake that works perfectly with XSi and MR but not with Vray :
ndo_IDirBlur v0.3

http://www.highend3d.com/shake/macro..._modified+desc

[winberg]

I was going to ask for a "velocity channel" render output map.

I am using AfterEffects for comping and it does not read the velocity information from rpf files..

There was a material for MR for max 6 that did this, but it doesnt work for max 7 apperantly..

-Tom

[gregg3d]

Seems that I’m not the only one to need an RGB velocity channel
Hope the Vray development team will take care of this post.

[vlado]

It would be fairly easy to do a "Velocity" texture map similar to the "Vertex color" map...

Best regards,
Vlado

[dimo]

Do you mean to calculate the rgb "velocity"color for each vertex and then interpolate between those Colors instead of interpolating the velocity?

[vlado]

Not exactly... the VRay SDK allows you to get the velocity at an intersection point, so a texture map could use this and convert it to a RGB color.

Best regards,
Vlado

[dimo]

Yes I thought I read about a velocity property in the class properties somewhere. I just was confused with the "vertex color" thing.


Dieter

[TomC]

I wrote a script once especially for the ReelSmart MB plugin. It was a render effect and had a separate output (just like an render-element). It worked well but had one major drawback : rendertime. It took like forever to compute the image so I had to abandon it. There was now way to optimize the script more.
Perhaps a 'real' plugin could do it a lot faster but before I look into it, I'd like to know if it would need to be written just for VRay. Would be very usefull if it could work for all render-engines.

thx,
Tom

[Morbid Angel]

its called a LaMaison shader. Dont think it will be of any benefit...however, perhaps for things like particles or hair on which vray fails to moblur this will be a good solution.

[ngrava]

So, Vlado how can we get a hold of the SDK?

-=GB=-

[dimo]

Tom: Theoretically you can do it for all renderers but it will be a lot easier to do it for vray because you can get the velocity directily from the intersection point. I just read briefly through the maxsdk shadecontext class and it seems to me that there's no direct access to velocity in max. So I suppose it will take a while to figure out how to get the velocity from the max shadecontext. But I think the information is stored somewhere.

Best Regards,

Dieter

[mike.edel]

btw, stumbled over a script for exporting motion vectors for ReelSmart motion blur in the discreet/autodesk maxscrip forums:

http://support.discreet.com/wb/defau...d=52708&fid=12

mike