Geometry nodes get instance position and use it recursively

[Boid]

Hi everyone,

I created a node setup that instanciates circles around another circle and placed it in a node group.

Nothing fancy here, just a bit of maths and geometry.

It created this kind of geometry

Now when I connect two of these node groups, I’m able to reproduce the pattern on the inner circle, which is centered at [0,0,0] like below with 3 levels.

Now my question is, How can apply the recursivity on the small circles around the original ones (the ones that have a radius R2) ?

Thanks

[canerasln (Caner Aslan)]

you can instance your node group on your circle(that was instanced) and do your math on that according to its radius.

like: node group > instances to points > instance on points (another nodegroup going to instance socket)

useful setup by the way

[Chanfiroly]

Not sure if this is the kind of solution you are looking for but maybe it helps. You can get the “radius” of the previous iteration via x or y coordinate of the bounding box like this (provided everything is lying flat on the local space):

[Chanfiroly]

And of course you can add the concentric “bound” circles by joining a circle of radius r2 + r3:

[Boid]

I realize I didn’t take time to thank you all for these answers, so now it’s done. Thank you Chanfiroly, your solution works great.