is it possible to randomly delete instance from top to bottom? tried some stuff but was only removing geometry and not instances created that small geometry node setup to scatter object on a curve but i would like to randomly remove instance on the z axis (like using a ramp) thanks!

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  • $\begingroup$ since we have no idea, how your GN tree looks like, you maybe wanna share your node tree with us via image or blend file? maybe this helps:youtu.be/ZleGuOP3Rpk $\endgroup$
    – Chris
    Commented Mar 4 at 11:54
  • $\begingroup$ See this: How to make disintegration or dissolve effect from center of the object with texture or geometry nodes? - specifically the Quellenform's answer. You could add a random value to the distance calculation (in your case height) to mix between randomness and from top-to-bottom transition. $\endgroup$ Commented Mar 4 at 11:59
  • $\begingroup$ makes sense^^ just added a screenshot of simplified version of the setup but its basically the same just adding some randomness to the instance, i m new to this and maybe i m doing things the wrong way, i use the duplicate elements to create some sort of wall and would like to be able to remove points at the top to create randomness to it $\endgroup$ Commented Mar 4 at 12:10

1 Answer 1


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With the following node setting:

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In this example the top instance is unstacked every one second.

It adds delta time of the simulation zone and check if more 1 second elapse is spent.

If yes, it gets the topmost instance, using an attribute statistics looking at max Z position value and delete the corresponding instance(s).

  • $\begingroup$ awesome gonna try that thanks! stupid question how do you get the cumulated time input in the simulation input/output? $\endgroup$ Commented Mar 4 at 14:08
  • $\begingroup$ just add a float input, for instance from the n panel once the group input is selected. Note that you provided a very partial information about your node setting, so, this answer may work directly or may need to be adapted. $\endgroup$
    – lemon
    Commented Mar 4 at 14:53
  • $\begingroup$ thanks! here is the file (simplified the nodes but its the base) dropbox.com/scl/fi/ycvtmyexh1o6kfufsmurz/… like i said pretty new with all that and just trying stuff out with what i find online, so if you have tips to make it better dont hesitate :) $\endgroup$ Commented Mar 4 at 15:49
  • $\begingroup$ Your file with the "unstack" + some randomness, if that can help: blend-exchange.com/b/w0mDP0xg $\endgroup$
    – lemon
    Commented Mar 4 at 16:13
  • $\begingroup$ awesome man thanks! $\endgroup$ Commented Mar 4 at 17:38

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