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This is probably a very beginner problem, but I'm stuck on it so thanks for your patience.

I want to make an object drop like a curtain from another object. I approached the problem by setting the z scale to 0 at the first keyframe and 1 at the end, but I can't figure out how to snap the top edge to the object above it while only the bottom edge moves.

Any advice is appreciated

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You need to position your origin at the element you want to anchor. This way, if the vertices are on the same Z as the origin, they are on the local Z=0, which means that scaling the mesh will multiply this 0 value by whatever the scale is - which will always result with 0, keeping the vertices at the same place.

For example:

  • Select the top face, ShiftS, T to move 3D cursor to selected face.
  • In Object Mode F3, search for Set origin to 3D cursor, and activate the operator.
  • Now try scaling on Z.
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  • $\begingroup$ Much appreciated. $\endgroup$
    – Roger
    Commented Feb 3, 2022 at 23:36

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