• Adobe After Effects Expressions

  Rotation to Opacity but ignoring the minus sign in the negative values

  Posted by Riccardo Sinti on August 19, 2011 at 8:14 pm

  I am using this expression to link the opacity of a text layer to the y rotation or another layer

  T = comp(“COMP_1”).layer(“Picture”).transform.yRotation;

  [linear(T, 0, 70, 100, 0)]

  The picture layer goes from 70 deg to 0 deg then from 0 deg to -70 deg and I want the opacity of my text layer to go from 0 to 100 and then from 100 to 0 as the picture layer rotates.

  So basically what I’m asking is how do I get the expression to ignore the minus sign in the rotation values?

  Thanks

  Dan Ebberts replied 15 years ago 2 Members · 1 Reply
• 1 Reply

• 

  Dan Ebberts

  August 19, 2011 at 8:34 pm

  This should work:

  T = Math.abs(comp(“COMP_1”).layer(“Picture”).transform.yRotation);
  [linear(T, 0, 70, 100, 0)]

  Dan

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