• Adobe After Effects Expressions

  Time Remap Loop using an Expression Control

  Posted by Robert Kornstein on March 5, 2014 at 2:02 am

  I am trying to set up a puppet for a character with a pseudo-3D effect. I have 8 images of the character at different angles, which, when viewed in sequence, form a 360 degree rotation around the character.

  I set up the 8 images in sequence in a pre-comp, and now I am trying to create a controller for the rotation using Time Remapping.

  How can I code an expression for Time Remapping to have it continue looping as the controller’s value goes up?

  Here’s what I have right now:

  This code is mostly non-functional. The top line makes it so that 1.00 on the slider = 1st frame of the pre-comp, and that’s about it. I don’t know how to make the If statement recursive so that it’s constantly checking to see if offset is less than 8 (right now it only loops once and then continues growing), and going less than 0 on the Slider does not rotate backwards, I’m guessing because you can’t have a negative Time Remapping.

  Does anyone have any tips that might point me in the right direction?

  offset = thisComp.layer("LI_rotation").effect("Torso Rotation")("Slider")/24;
if (offset > 8){
offset - 8
}
else if (-8 <= offset <= 8 ) {
offset
}
else if (offset < -8) {
offset + 8
}

  Dan Ebberts replied 12 years, 2 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Dan Ebberts

  March 5, 2014 at 4:27 am

  If you use the modulus operator (%) you can create a sequence from 0 to 7 that repeats as the offset goes up, like this:

  offset%8

  If that corresponds to a frame number, then you probably need to do it this way for a time remapping expression:

  framesToTime(offset%8)

  Something like that.

  Dan

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