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I would like to do what is described here: https://www.youtube.com/watch?v=CedtNe4CFrk&ab_channel=RyanMaggs

And here: Geometry nodes circle point instance looking towards center

The trouble is that both are done in the old version of Geometry nodes. I'd like to do this for Blender 3.1.

I have some cylinders, and I'd like them all to point to the sphere at the center:

enter image description here

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The related question that you have linked is already for Blender 3.0 and Geometry Node Fields.

The missing part is probably the direction vector.

If you want to let objects point all to a target you need to calculate a vector that points in this direction for each object. The vector is v = location B - location A.

location A is the position of the point/object from the Position node and location B is the position of the target from the Object Info node's Location. Use a Vector Math node to calculate the vector v.

Then use this vector v for the Align Euler to Rotation node to calculate the needed rotation of the points/objects. That's it.

geo nodes setup

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