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enter image description hereI have a grid with instances. I then added an Empty Sphere and want to rotate all of the instances 90° which are within the range of the Empty Sphere. I figured out to rotate all of the instances at once, but can't figure out how to rotate each instance separately at the location of the Sphere.

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You can use the Geometry Proximity node. (You will have to parent a single vert to the empty as the node works with geometry only)

Then using Compare: Less Than to get a boolean output to use as the selection for the Rotate Instances node, you can rotate the instances to 90 deg within the threshold you set in te Compare node.

Now I have used the Empty Display Size as driver to control the threshold. But you can do the same with the scale instead. That will just be a little bit of more work to do.

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