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Motion tracking anchor points?
I’m trying to understand something – If I have a person filmed on green screen, and have motion tracked the camera movement, and then want a background behind; rather than applying motion tracking calculations to the background directly, can I make it so the background really moves as if within this environment. If I match the tracking movement, the background moves more than it should.
to fully understand what I’m trying to explain – The further the background is from the character, the less it would move, as if in real life. Like when you look up at a starry sky, the stars do not move much, whereas an object directly behind the character would move much more. Do I have to work within a 3d environment in after effects and place my null object where I want it and the background further behind?
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2 Replies
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[Phil Beastall] “The further the background is from the character, the less it would move, as if in real life.”
I think you’ve got it backwards.
Assuming the distance between the camera and the subject (actor) doesn’t change, the further away the background is, the MORE it will appear to move.
Try holding your finger up in front of you, with (for example) a painting in the background. Move your head slightly to one side.
Now move closer to the painting (keeping your finger at the same distance from your face) and repeat the process.
You’ll see that the closer you are to the painting, the LESS it will appear to move (in relation to your finger).
The further the camera (as opposed to the background) is from the subject, however, the LESS the background will appear to move (relative to the subject).
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yeah you’re right. Thanks for that.
Any idea how I can create this effect then?
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