Exporting Alpha-Channels or Luma-Mattes right

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  12 December 2012
Exporting Alpha-Channels or Luma-Mattes right

hi guys, i have a question regarding the export of alpha-channels or luma-mattes for certain objects out of 3ds Max 2011 for After Effects CS6.

I recently started with 3Ds max and work now on my first matchmove. I'm trying to find the best workflow to get my render passes into After Effects CS6 for compositing.

Right now, i know about the opportunity to use Object-IDs which contain mattes with a certain color for every chosen object. The pass includes information of occlusion between the objects.

But i think its just a workaround because you have to color-key every object to get its matte separatly. In addition, somehow you can run into trouble regarding the edges when tweaking tolerance parameter. Also you need a color-key for every object you want to separat from the others. Not very handy regarding system-ressources.

Or is this common way to do it?

What i would like to achieve:
An opportunity to render my object-mattes like in Cinema 4D: Object-Buffers. So i have one matte for every object i gave an ID.

Does anyone know how to achieve a multipass-render (with a functionality like Object-buffers in C4D) in 3Ds max 2011?

I'm also thankful for links hinting to a solution. I searched a lot but couldn't really find what i was looking for.

Any help is appreciated



Last edited by psybak : 12 December 2012 at 03:55 PM. Reason: text color was "cheap" ;)
  12 December 2012
no one, really?
  12 December 2012
Hey there - ObjectId's in Max are set to 100% red/blue/green or a combination of the above - e.g magenta/cyan.

So rather than using colorkey which does mean you have to play with tolerances - try the method linked to below.
(This is actually a Substance tutorial but the colour theory will be the same in AE.)

Look at "Channel Mixer" in Ae and select the Monochrome switch at the bottom of the effect.
This is a start on how to create and isolate the various colours that Max creates in Ae.

http://www.youtube.com/watch?v=b3GLmWoXN5I about 13:15s
Renderfarm hire available @ www.hotknife.co.uk
  12 December 2012
Thanks a lot!

I will have a look for the video and hope that it'll answer my questions and then guide me to a solution.

Thx again!
  12 December 2012
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