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How can I instance object on points of another geometry, but limit number of points used? Here is my current node set up:

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I want to use the Selection socket on Instance on Points node, but I have no idea how to use it. I tried Noise Textures, Random Values and can't figure out how to randomly limit number of points used?

Is there a way to get ID / Index of each point and then randomly select 40% of them for the Selection, to Instance Cubes on the base Mesh?

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2 Answers 2

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just plug this into your selection of your point instance node:

enter image description here

This won't give the "exact" amount, but a good approximation.

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  • $\begingroup$ Chris, this is super simple - I tried Random Value, but with Float and trying some gymnastics with ID, but it was not working. This is super easy and efficient. Thank you! $\endgroup$ Commented Mar 7, 2022 at 11:00
  • $\begingroup$ You are welcome! Glad I could help! $\endgroup$ Commented Mar 7, 2022 at 11:04
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Chris answer is simple and efficient way to "cut" through number of instances on points randomly.

There is a different way, if you want to have some pattern / texture, when instancing on your base mesh. Somehow, when I first tried doing this with Noise textures, I did not try it with Noise + Color Ramp nodes and it did not work.

Here how it looks now:

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Noise Texture with Color Ramp:

enter image description here

Musgrave Texture with Color Ramp and so on:

enter image description here

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  • $\begingroup$ Thanks, this is exactly what I was looking for! $\endgroup$ Commented May 5, 2023 at 15:58

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