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Scale proportionate to z space
Hey there. I was wondering if there was a script or expression that would scale an object proportionate to its distance in Z space so that it appears to stay its original size. I have to animate a subtle camera move from a photo and it would be great if I could push my cut out layers back and forward and have them scale to recreate the original photo automatically. distance can’t be measured from the camera, because I hope to move this about…
anyway. Thanks in advance for the help.
Sincerely
Peter -
2 Replies
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This may work for you. Start out with all your pieces at z = 0 and your camera on the z axis. Add a slider to each piece you want to reposition. Set each slider to 100. Add this position expression to each piece (changing “cameraZ” to the starting z position of your camera):
cameraZ = -888.9;
zControl = effect(“Slider Control”)(“Slider”);
cameraPos = [thisComp.width/2,thisComp.height/2,cameraZ];
(value – cameraPos)*zControl/100 + cameraPosAdd this expression to the scale:
zControl = effect(“Slider Control”)(“Slider”);
value*zControl/100Reposition the pieces by adjusting the sliders. Slider values of less than 100 will move the pieces towards the initial camera position – values of greater than 100 will move them away. After adjusting the sliders, the image should still appear the same until you start moving the camera.
Dan
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Thanks alot Dan it works very well.
cheers
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