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# 1 24-05-2005 , 05:31 PM
Dann's Avatar
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alpha blocker

I'm trying to create an object to knock out part of my scene. Escenitally what I want is a useBackground shader that looks at an image sequence to define it's border and not the whole object.

I've tried assigning the maps to the Matte Opacity, but that doesn't do it. I've tried setting the Matte Opacity mode to black hole, solid matte, and opacity gain, but to no avail.

Anyone know how to do this?

:headbang:
-dann
 
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# 2 25-05-2005 , 08:08 AM
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could you not just map it onto the transparancy channel and then run that as a separate pass and then you will get the matte of the object by itself that you can use in comp.

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# 3 25-05-2005 , 02:32 PM
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Well I need to have a particle system that wraps around it so while some are still behind it, others are crossing in front of it. No worries though, I got it working. The solution was to map my images to the transparency and set the matte opacicty to zero.
 
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