Forums › Adobe After Effects Expressions › Tracking Dots
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Tracking Dots
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John Flynn
April 27, 2005 at 1:21 amI’m tracking footage using dots manually placed on an object. The dots were placed too far inside of the area needing to be covered, though. Is there a better way to fix this than moving the corner points over frame by frame to compensate? (Scaling the footage throws off the tracking).
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John Flynn
April 27, 2005 at 1:57 amI found an expression that I think works that I will try. Suggestions are still welcome if you feel like it.
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Filip Vandueren
April 27, 2005 at 4:12 amIf you’re using Corner Pin with those dots here’s a project with some scripts:
Recipe:
- On the layer “Corner Pinned Footage” there’s a Point Control, a Slider Control, and the Corner Pin-effect with some keyframes
- copy the Point control and it’s expression to your Corner-Pinned layer
- Convert it’s expression to keyframes !
- copy the “scaler” Slider Control leave it set to 1.00 for now.
- now apply this expression to each of the corner-pins:
c=effect("Point Control").param("Point");
// c is the scaling-center
s=effect("scaler").param("Slider");
// s is the scalec+(value-c)*s
- Now you can scale the cornerpin using the scaler-slider
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John Flynn
April 27, 2005 at 5:49 pmI actually got it done already. I found an expression on aenhacers.com that works perfect. Gave me a slider to control the scaling, like your script. It was simple to.
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John Flynn
April 27, 2005 at 5:50 pmI mean too.
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