I'm currently trying out 3Ds Max, working on an animation
Is it possible to render ONLY a motion blur layer and then somehow use it to composite it in 3Ds Max? I ask because the default mental ray motion blur takes a long time to render when doing 1500 frames (get's around half way through with 17 hours rendering...)
I've also read I can do it with the scanline renderer which is apparently faster and then composite that ontop of my mental ray layer, using After Effects.
If rendering time is too high but you have a litle bit of a budget, I would suggest using a render farm as they can turn around in a matter of hours what takes day to render on one machine. The one I use is a uk based one called Render-IT (http://www.render-it.co.uk). Hope that helps!
You can add a render element called velocity pass, this is an image that looks exactly the same as your main pass but has a diffent colouring based on the speed and direction the scene/oject is moving in...
anyways that wont add to your rendering (its done for free when you render your animation), it will however give you an image sequence that you can plug into reel smarts motion blur plugin in after fx that will give you some nice looking MB thats pretty accurate!
therefore you wont even need to render a motion blur in max..
ps use sticking Reel Smart on top of your work is normally good enough anyways! even without a velocity pass!