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Activity Forums Adobe After Effects Animating line thickness and length

  • Animating line thickness and length

    Posted by Jeff Davis on January 30, 2026 at 4:19 am

    I’d like to create a line that gets fatter as it lengthens from left to right, but I want the previous thicknesses to remain unchanged, so at full length it will look kind of like a stretched out triangle (one pixel on the left, 25 pixels on the right). I’ve tried combining the stroke width property with the trim path property, but that fattens the entire line as it grows (see below), not the effect that I want.

    I realize I could draw the final shape and reveal it with an animated mask, but I was hoping to do it just with properties for simplicity. Is there a way?

    Jeff Davis replied 3 months, 2 weeks ago 2 Members · 2 Replies
  • 2 Replies
  • John Martin

    January 30, 2026 at 5:58 am

    yo Jeff! i’ve recorded a custom tutorial with the solution that will push you in the right direction. I hope you like it! 🔥

    https://youtu.be/dLjc53dP5HQ

  • Jeff Davis

    January 30, 2026 at 6:15 am

    Man, you embarrass me. That’s great. Thanks!

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