Z-depth and motion pass, different layers for diferent objects?

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  04 April 2013
Z-depth and motion pass, different layers for diferent objects?

hello fellas!

I have a non-technical question that should be easy to answer by someone who has some experience in compositing:
I have this sequence, 1300 frames long, with some objects (crane, and lights) that are distant from the background (high disparity).
I've already rendered all the beauty frames, and used contribution maps to separate the background, crane, and lights, into separate layers.

Since I'll be compositing in nuke, and adding motion blur and depth of field in post, these two specific passes, should I render with all objects in the scene(thus outputing the whole scene into one EXR with the two passes), or should a render in separate layers for the engine crane, the lights, and the background (so each layer would have the two passes for the objects contained in it)?

What problems should I expect when compositing, if I opt for the first or the second method?

Thanks in advance

 
  04 April 2013
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