Use roto brush result in another layer

Hello!

I used the roto/refine edge brushes to isolate an object FG in a few sequences of shooting. I would take the resulting mask from that and use it to cut a few 3D layers that should seem to be behind it. Is it possible to export the result as a mask roto brush, or use the roto brush effect to another layer? Or even to export just the alpha in the images I can pull back as a layer of film?

The only solution I can think of right now is to copy the film with roto brush effect layer and the layer of the FG of the 3D elements cutting element, but I prefer to keep the 3D elements instead of adding an extra layer.

Clause of the disclaimer that I am relatively new to AE, even though I'm known in other packages.

Thank you!

There is no rendering hit with two copies of your roto masked layer. There is no reason not to duplicate the layer and make a matte. You must have a source for the alpha somewhere. If you disable the RotoBrush effect, is all the same that never apply there is therefore no mast to extract. I would duplicate the images first, then roto first folio of the layer and use it as a matte.

If you really do not want to duplicate the layer, but still want to have access to the info Matt Rotobrush you can use other techniques to rearrange the order of rendering so that the mask of roto is still usable but the images don't seem to be hidden. This will only two layers in your main computer.

Before dialing your rotoscoped film move all attributes. This puts the mask on top of the rendering order. Apply presets for the layer of film of Pre-composed and the Alpha value, the bottom option, full. This leaves the first instance of the alpha in the rendering order stack. You can then use any presets or Set Matte on the layer that you want to apply the matte roto to extract alpha from the top of the rendering order. In this way the Alpha is extracted from the Rotobrush until the Alpha is set to integer by presets. It is the only way not to have only one copy of your images in your main comp, but it would take so much time to make simply to use a duplicate and follow mast.

Another option would be to RotoBrush your film and then make a copy with alpha and then apply Set Matte or make a single copy of the alpha of the images to use as a matte.

Tags: After Effects

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