Motion Blur just on helicopter rotars?

[Stephen Hughes]

Hi there,

 

I have a large architectural scene, and have it set up to send to a renderfarm for animation. In it there is a helicopter and the camera pans past it during the anim. The rotars are animated to spin but without motion blur the rotars dont look great or realistic. But adding MB through my vray physicalcam obviously adds it to everything in the scene, which isn't really what i want and slows the rendering of each frame down a lot.

 

So does anyone know if a) just the animated rotars can have motion blur applied to them, or b) if there is some way of adding motion blur in after effects, again only to the spinning rotars??

 

note: i have an element3d helicopter for other clips which looks great with the ae motion blur, but for the scene in question the helicopter travels in and out of trees so cant really composite it into this scene unfortunately.

 

Any help would be greatly appreciated.

 

Stevie.

[Stephen Thomas]

It can definitely be done, though you may need to use a standard max camera I think. That way you can turn on motion blur under Vray Camera override in render settings but turn off camera motion blur. Also make sure you increase the number of motion blur samples for the rotors in the vray properties to around 10 to get circular blurring.

Edited August 30, 2013 by stef.thomas

[Josef Wienerroither]

AFAIK

you can disable the motion blur sampling in the "Vray Object Properties" dialog for all objects except the rotor blades. Or render them out seperatly and compose the layers afterwards

[Nicolai Bongard]

This might also be of help, use a velocity pass and fix the blur in post: http://www.ramyhanna.com/2011/02/render-today-motion-blur-tomorrow.html

[SgWRX]

i've found this series of videos to be very helpful when i recently had a couple helicopters taking off/landing.

[Josef Wienerroither]

This might also be of help, use a velocity pass and fix the blur in post: http://www.ramyhanna.com/2011/02/render-today-motion-blur-tomorrow.html

Indeed,eg. in the post, Reelsmart Motionblur does a good job when it gets motion blur vector data to work on....