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alpha matte?

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gin lee
alpha matte?
on Sep 26, 2011 at 11:59:29 am

the sphere come up form the ground

how to hide the sphere under the plane

http://i868.photobucket.com/albums/ab249/gin1211/blast.gif

camera will move...



Thanks!!


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Steve Sayer
Re: alpha matte?
on Sep 26, 2011 at 7:30:38 pm

Put a cube around the sphere under the plane. Then assign 'Use Background Shader' to that cube. It will hide the part of the sphere inside it.

-Steve


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gin lee
Re: alpha matte?
on Sep 27, 2011 at 7:30:20 am

It works!!! Tks


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gin lee
Re: alpha matte?
on Sep 27, 2011 at 6:00:17 pm

does it have anyway to hide and keep alpha...


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Steve Sayer
Re: alpha matte?
on Sep 27, 2011 at 7:26:23 pm

You mean you want the box to hide the sphere, but you still want the shape of the sphere to be visible in the alpha? No, I don't think there's a simple way to do that. Maybe what you should do is forget the box, and use a layered shader on the sphere, set up so that is uses a 'Use Background Shader' below the surface, and a regular shader above.

-Steve


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