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I want a Shape Key's value to be driven by another shape key. But I don't know how to add a shape key value as a variable into a driver. I've selected single property and tried with Object or Mesh types.

enter image description here

Do I need to select another one?

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  • If you use an object in the Prop field, the path to the shape key is like this:

    data.shape_keys.key_blocks["Key 1"].value

  • If you use a mesh, you don't have to put data there, so:

    shape_keys.key_blocks["Key 1"].value

    enter image description here

  • And if you use the Key Prop field with your key block there, then you can just use:

    key_blocks["Key 1"].value

    enter image description here

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