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3d tracking and moving mask

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John Estes3d tracking and moving mask
by on Jun 28, 2014 at 6:34:43 am

I have what may be a dumb question. But I am struggling to find the right answer.

I have used syntheyes to track a sequence. I have imported to after effects. Objects are placed and scaled properly when the items ( images) are placed in 3d space. They track properly.

What I want to do: Mask out a portion of the 2D footage I tracked in syntheys and attach the mask to a null in 3d space which is parented to a image I want to use for a set extension/matt painting. (Imagine castle on horizon line of tracked footage).

My problem: I cannot figure out how to mask the 2d footage and use the tracking data to make the mask move AND MASK MY FOOTAGE.

The only way I can figure out to mask the footage is by drawing a mask on the original footage. I can't make a mask drawn say on a null or adjustment layer affect the tracked 2d footage.

Problem seems to exist with 3d layer perspective and 2d layer masking.

Help please.



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Michael SzalapskiRe: 3d tracking and moving mask
by on Jun 30, 2014 at 1:15:46 pm

You could create a solid, place it in 3d space, sized appropriately, then mask that and use it as a track matte on a copy of your layer.

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(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')

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