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Importing Multipass Rendering [ANSWER]

Posted: Mon, 29th Jan 2007, 2:19am

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bobzilla

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I just downloaded the CompositeLabPro demo for Mac and I'm trying to work out how multipasses work. I had originally done .psd files, but they didn't work, so I changed them to TIFFs and I could import them.

I can't seem to isolate the pases, though. For instance, I have a shadow pass that I would like to darked or lighted, but what ever I do seems to effect the entire scene, not just the shadow pass.

I also rendered some alpha masks to isolate some foreground objects. No mattter what I do, I can't seem to get an effect to just affect the masked area (from the alpha pass).

Is there a step by step I can follow somewhere? And is there a PDF manual I can download for the app?

Thanks...
Posted: Mon, 29th Jan 2007, 3:02am

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Hybrid-Halo

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Hey there BobZilla, welcome to FXhome.

Which program are you rendering the Multipasses from? I use Cinema4D and each pass is rendered to a seperate file. file_shadow, file_rgba, file_reflection and so on.

You'd have to import each layer individually into CompositeLab and place them seperately on the timeline, then apply grading to each individual layer so you could tweak them individually. I'm not sure what to suggest regarding your alpha masks though.

With the demo, there should be 2 documentation files included - A Quickstart and the full manual within the programs install directory. Ontop of this there are also some video tutorials available through the site via the support tab up top.

I hope that helps, if this doesn't answer your question could you please list some specifics regarding the programs you're rendering from and I/other members may be able to find a solution.

-Hybrid.
Posted: Mon, 29th Jan 2007, 9:50am

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Simon K Jones

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Make sure you're applying grading to a specific object's grade track. If you are using Grade Objects, then every single layer underneath it will be affected.
Posted: Mon, 29th Jan 2007, 12:58pm

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bobzilla

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Thanks for the help, guys.

Hybrid: I, too, am using Cinema 4D an this test was my first multipass render, so It may not be correct.

How do you set up your multipass? I noticed the shadows are in the RBA file as well ast eh shadow, so I know I didn't set that up correctly.

And the alphas I wanted to use to isolate certain objects for furhter tweeking.

Tarn: I think I was doing that incorectly. I was using adding a Grade Object to the timeline, not the individual object. How do I do that?

Thanks again for the help!
Posted: Mon, 29th Jan 2007, 1:44pm

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Simon K Jones

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Click on the 'Grade' track on the timeline that corresponds to the particular object in question.

I'd recommend checking out the 'Timeline' and 'Toolbox' video tutorials:

http://fxhome.com/support/vidtutes/?t=8&f=%2Bcat%3A1&cat=1
Posted: Tue, 30th Jan 2007, 1:05am

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bobzilla

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I guess the confusion I'm having is that in appa like Photoshop (and I imagine AfterEffects) you can make your mask a selection, which I don't see a way of doing in CompositeLab.
Posted: Tue, 30th Jan 2007, 1:38am

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Hendo

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I may be misunderstanding what you're trying to do, but have you looked at using an Object Mask?

Object Masks allow you to take the luminance or alpha information from another layer and use that information to create the mask.
Posted: Tue, 30th Jan 2007, 1:44am

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bobzilla

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I tried that, but I think I'm just doing something wrong at this point. Just not sure what...
Posted: Tue, 13th Feb 2007, 9:14am

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Cogz

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I'd try taking a look at this video tutorial on masking, it might help explain object masks and the alpha channel better than we can in words:

http://fxhome.com/support/vidtutes/?t=3&f=%2Bcat%3A1&cat=1