3 Replies Latest reply on Mar 14, 2013 7:58 AM by SeanH_bos

    problem with keyframe interpolation

    SeanH_bos Level 1

      So I'm trying to figure out the keyframe interpolation for a simple animation I want to make.

      The icons below fly in from off screen through Z space, once they land in the monitor, they slow WAY down, and continue backward along the Z axis. Fast to slow along Z axis.

      What's happening is a bouncing effect of sorts at the end of the animation, between the 2nd and 3rd keyframe.

      All of these are set to Linear Interpolation, but I've messed around with Bezier both in the timeline and in the Graph Editor, and I always get a bouncing effect toward the end - it's going well beyond the '10' value I set, pushing toward '150', then snapping back toward '10' at the end.

      What am I missing with this? It should be a simple animation but my keyframes aren't responding properly...

       

      keyframe screen.png

        • 1. Re: problem with keyframe interpolation
          Dave LaRonde Level 6

          There are Bezier handles not only in the graph editor but on the position keyframes in the comp window.  When you adjust them properly, your bouncing problem will disappear.

          1 person found this helpful
          • 2. Re: problem with keyframe interpolation
            Rick Gerard Adobe Community Professional & MVP

            Set spatial interpolation for that keyframe to Linear. You can do it in the comp window using the convert Vertex tool on the motion path or you can select the keyframe and set the interpolation by context clicking on the property.

            1 person found this helpful
            • 3. Re: problem with keyframe interpolation
              SeanH_bos Level 1

              This was the issue.

              I did a little digging around on keyframe interpolation in the After Effects help, and here's what I found:

               

              "In some cases, the Auto Bezier spatial interpolation for Position keyframes can cause undesired back-and-forth (boomerang) motion between two keyframes with equal values. In such a case, you can change the earlier keyframe to use Hold interpolation or change both keyframes to use Linear interpolation."

               

              Once I changed the last two keyframes' Spatial Interpolation to Linear, problem solved. Thanks Rick!