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masking out part of a material for compositing

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Jake Martin
masking out part of a material for compositing
on May 18, 2013 at 10:18:29 pm

Hi

I am rendering out a globe.
So I have one big world texture on a sphere.
I need to composite in a plague spreading across Africa.
So I have a mask for the parts I need.

My question is where do I put the mask in C4D so that I get a mask in the multipass.
If I put in the alpha channel of my material it cuts out part of the map.

I have been at this for days, can somebody please help.


Thanks

Jake


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Adam Trachtenberg
Re: masking out part of a material for compositing
on May 18, 2013 at 10:46:14 pm

I would create the alpha and then do a separate render with just your globe and cameras to get the object buffer.


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Jake Martin
Re: masking out part of a material for compositing
on May 19, 2013 at 7:36:42 am

Thanks Adam

I tried that before but when I got it into After Effects the cameras seemed out of sync.
I was using a regular camera and animating it. Is the sync thing a C4D or AE issue do you think?

The animation was also a bit jerky so now I'm going to try camera morph.

Cheers

Jake



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Adam Trachtenberg
Re: masking out part of a material for compositing
on May 19, 2013 at 3:56:17 pm

Hmm, there should be no difference assuming you didn't change the Cinema camera settings ... and have the same frame rates.


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