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Creating an alpha channel on 3D text
Hello, hope I can explain this properly: I have some text which is revealed using a light in AE7. They are 3D so the light picks them out (though not special 3D objects from another program)
I wanted to create an alpha mask to put this type over another video. Unfortunately, the problem I run into is that though the text is black before the light hits it, it still shows up in the alpha channel. So you see black letters before the light hits them. I thought the alpha would knock out everything black and only retain the color, but it must have something to do with it being 3D (can you tell I’m an amateur yet).
Any suggestions? I tried Xmult and though that did get rid of the black letters just sitting there, the matte was not acceptable and made it look terrible. Any other ideas?
Thanks for the help
Talia
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1 Reply
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If you didn’t have success with something like Xmult or Unmult (which will probably need to be applied to an adjustment layer above the text layer to work) then I can suggest a workaround. Duplicate the text layer that is receiving the light, turn off accepts lights on this layer and place it below your original layer, then set this layer to use the original layer as a Luma Track Matte.
This will only work well if the layer receiving the light is white, so if it’s not you’ll need to make it white. Also, if the text is animated I’d recommend removing those keyframes from the duplicated layer, going to the beginning of the composition and parenting the duplicate to the original, then make any adjustments to your keyframes on the original.
Darby Edelen
DVD Menu Artist
Left Coast Digital
Aptos, CA
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