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Pick whipping Masks to a Motion Track
Hey, guys. I’ve gotten a lot of good help from this place, so I thought I’d come back now that I have another problem.
I have a clip of a doorway, during which the camera looks at the top of the door, then pans down to show the whole door. The top of the doorway stays in view the whole shot, so I have been able to motion track the top right corner of the door frame. I am adding in a different door into the doorway than was there originally.
My problem is that, I have masked out the original door in the footage on the first frame, and I want to pick whip the mask to the Null object I have applied the motion track to, or somehow otherwise make the mask follow the motion track, so that when the camera pans down to show the whole door, the mask will continue to cover the doorway as if my replacement door has been there the whole time. I just can’t figure out how to do that, if there is even a way. Will I just need to rotoscope the whole thing?
Let me know it that description is confusing at all.
Thanks for any help.
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2 Replies
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It sounds like you are going about it the wrong way. Is there a reason you can’t apply the mask to the new door (revealing only the door on that layer), then applying the motion track to the position of that entire layer? The new door would of course be on the layer above the footage with the old door in it.
You wouldn’t even need a null object using the method above unless you planned on having several layers linked to the motion track movement. Please let me know if there is a reason you aren’t using this method.
Jon Geddes
Motion Graphics Designer
http://www.precomposed.com -
I guess I just never thought of it that way. I will try that, thanks.
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