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Objects rotation dictates precomp’s rendered frame?
I feel like this is going to be really hard to describe.
Comp A has a 2 second looping animation of a rectangular prism rotating towards the camera.
Comb B has a rectangle with a Precomp of Comp A parented over it.
I want the rotation of the rectangle to dictate what frame of Comp A for Precomp A to render at any given time.
For instance, if the rectangle has a rotation of 0, it will render Precomp A from frame 0 of comp A. If the rectangle is rotated at 180 degrees, it would render the precomp to appear as it does in Comp A at frame 30. Am I making sense? I feel like I’m not making sense. Here’s a picture I drew in 5 minutes.
Either way, if you can decipher what I’m trying to get across, I’d love to hear your thoughts!
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5 Replies
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I would think a time remapping expression like this would do it:
degPerFrame = 6;
r = thisComp.layer(“rectangle”).transform.rotation;
frame = r/degPerFrame;
framesToTime(frame)Dan
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Awesome, that’s works exactly as I wanted it to! However, I do have a few questions.
Comp A is only 2 seconds long, making a single full rotation. This means the rectangle in Comp B can only make one full rotation of 360 degrees before the fake 3D stops working. Same thing with rotating counterclockwise; once it goes into negative rotation it will render Precomp A as it appears on frame 0 of Comp A. I suppose I could make Comp A longer and fiddle the expressions a little bit, but I feel like theres probably a way to get it to work indefinitely in its current state, regardless of how many times it has done a full rotation.
Thanks for all your help so far though, it looks amazing.
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(Here’s what it looks like now)
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Try changing this line:
frame = r/degPerFrame;
to this:
frame = (r/degPerFrame)%60;
Dan
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Perfect. Works flawlessly! Now if only I knew what any of these things meant rather than simply copy-pasting them, I’d be on fire!
Thanks again for the help.
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