Matte to roto

Does anyone know of a way to convert mattes to a gmask or gmask tracer shape?
I can do it with Furnace matte to roto, but it’s quite long winded and when I import the resulting gmask into the tracer, it comes in as a 3D text node, with no control over the shape.
I was hoping there may be a matchbox that does this.

This would be a powerful tool to have, but last time I checked, there wasn’t such a thing in Flame. And I don’t think MX has the capability of creating splines.

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There was a kind of a Flame research project presented by Will Harris at logic live session #32 starting at about 50min of the video. An alpha to GMASK extract method was part of it. Was this ever since introduced?

Not a fully automatic mode, but quite workable if you want… Took me about 5min.

Once you have your matte (I did a quick key on the lips of this RED sample clip - not the best key by any means):
Screenshot 2024-01-04 at 2.37.39 PM

Screenshot 2024-01-04 at 2.37.50 PM

Add a Mocha node to the matte output. In Mocha use the magnetic tool to follow the outline of your matte. Track it. Export it as GMask Tracer.

Screenshot 2024-01-04 at 2.38.26 PM

Import it.

Screenshot 2024-01-04 at 2.38.47 PM

Screenshot 2024-01-04 at 2.38.54 PM

Might want to clean up the magnetic spline to have fewer control points, unwieldy otherwise… But that’s a different matter.


This is great to know.

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If you have mocha.