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Waht I do:

  1. In my case, I capture Index using a Capture Attributes, and then put the value to a Noise Texture. It works fine. You'll see the IcoSphere distorted.
  2. And then when I change the Index to Normal / Position, I got a IcoSphere without distortion.

My Questions:

  1. Why it works with Index but Normal&Position fails.

enter image description here

enter image description here

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In your second example, your Set Position node is still linked to the geometry output of the first Capture Attribute node--which is getting the Index information but not doing anything with it. As noted in the manual, you need to use the geometry output of the Capture Attribute node you get the information from for it to have an effect.

enter image description here

P.S. You don't need the node at all here in this case, it's redundant:

enter image description here

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    $\begingroup$ oh, thank you. I really made a silly mistake. And still learn sth else from your answer. BlenderStackExchange answer anything I wonder, so nice of you guys. $\endgroup$
    – shibi
    Commented Mar 5, 2022 at 13:21

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