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I have created a point cloud map for a UV unwrapped plane which corresponds to a texture. The plane is being instanced on a curve then I am distributing points onto the instanced plane from within the Curve Node-group, I would then like to utilise the UV Data of the instanced object to influence the point distribution.

enter image description here

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  • $\begingroup$ Could you share your blend file? It's not clear to me exactly how your nodes are structured and where you want to access which values. $\endgroup$
    – quellenform ♦
    Commented Apr 2, 2022 at 9:42
  • $\begingroup$ Hi, I've included a blend file with the problem broken down. I've also made an edit to the question. $\endgroup$
    – special_frog
    Commented Apr 2, 2022 at 11:10
  • $\begingroup$ Next time don't forget to pack the resources when you share a blend file ;-) $\endgroup$
    – quellenform ♦
    Commented Apr 2, 2022 at 12:19
  • $\begingroup$ I'm not really sure, if I understood, what you want to achieve. But if you want to have more control over the distribution of the points, you may use weight painting. $\endgroup$
    – André Zmuda
    Commented Apr 2, 2022 at 22:26

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If I understood you correctly, simply put, you want to use an image to influence the distribution of your points.

If this is the case, then you have the following options:

  1. Distribute points on your surface

  2. Measure the dimensions of the point distribution

  3. Map the coordinates into a range from $0-1$ (your UVs start at $(0, 0)$ in the lower left corner and end at $(1, 1)$ in the upper right corner)

  4. Use these positions as vector for your image texture and remove points from the cloud that match your rule

enter image description here


(Blender 3.1+)

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    $\begingroup$ Thanks! this was pretty much what I needed. I turned the scale back into a vector and also plugged a vector add after the position to get further control. After reviewing, I guess my question was how to scale the UV map geo nodes side, rather than getting the UV map in the first place. $\endgroup$
    – special_frog
    Commented Apr 3, 2022 at 1:59

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