• Adobe After Effects Expressions

  Link Opacity to Y position

  Posted by Topher Blair on April 5, 2017 at 10:46 pm

  Hi,
  I need to be able to link Opacity to the Y position of an object. If the object is above -80 y position, it needs to be full. If it’s below 80, it needs to be at 0% opacity. if it’s between the two it needs to fade. Is there a way to accomplish this?

  Thanks!

  Topher Blair replied 9 years, 4 months ago 1 Member · 2 Replies
• 2 Replies

• 

  Topher Blair

  April 5, 2017 at 11:16 pm

  Hi, I actually miswrote what I meant. If y is less than 460, then I need opacity needs to be 100%, if it’s greater than 620, it needs to be 0%
• 

  Topher Blair

  April 5, 2017 at 11:22 pm

  Actually I think I’ve figured it out. Not sure that this is the most elegant solution, but this is what I came up with…

  if (transform.position[1] < 460) t = 0 else
t = (transform.position[1] - 460)/160
linear(t, 100, 0)

Reply to this Discussion! Login or Sign Up