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Activity Forums Adobe After Effects strange extra masks between keyframes

  • strange extra masks between keyframes

    Posted by Tim Mccarthy on May 24, 2023 at 4:18 pm

    I’m trying to mask foreground portions of video in an exercise and I’m getting strange masks in between the keyframes. See photos. The keyframe masks are correct but in between are odd-shaped masks. They repeat in several areas of the composition. Anyone have an idea?

    Graham Quince replied 6 months, 1 week ago 2 Members · 1 Reply
  • 1 Reply
  • Graham Quince

    May 27, 2023 at 1:18 pm

    How are you generating the masks? I think what’s happening is you’re using auto-trace or similar and each mask is then acting as if it’s brand new and has it’s own origin points. When animating together, you’re getting the points not lining up as you’d expect, so they are flipping the mask shapes.

    If that’s the case, you need to right-click on a common point for each mask keyframe and choose: Mask Shape & Path > Set First Vertex.

    I made a video a while back about morphing masks:

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