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I have a problem with Random Instance Rotation, when using Arc / Trim Curves node. I'm trying to do something similar in this tutorial, but only with Geometry Nodes.

Here is my node set up:

enter image description here

Which results in this:

enter image description here

Arcs have different heights, which I want. But I can't make them rotate randomly on individual Z axis at all. The Random Rotation group does not work and I can't figure out why.

If I use Curve Line as Instance, without Trim group, I can create Arcs and then Rotate them randomly, like this:

enter image description here

But I don't get the individual height trim. It looks like this:

enter image description here

I have tried different combinations of the above and I am stuck. Is there a specific step that I am missing? Any help would be much appreciated.

Here is Blend file:

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    $\begingroup$ pls upload your file $\endgroup$
    – NatureK
    Commented Mar 14, 2022 at 12:17
  • $\begingroup$ i don't get it. The link IS about GN....!?? $\endgroup$
    – Chris
    Commented Mar 14, 2022 at 12:21
  • $\begingroup$ @Chris - yes, the YouTube tutorial is about the GN. But I want to recreate his set up completely in GeoNodes, without drawing any curves etc. Scatter some points > Instance Lines > Random Trim of those lines > Create Arcs > Random Rotation. But for some reason the Random Rotation is not working for me. $\endgroup$
    – kurnikoff
    Commented Mar 14, 2022 at 12:24

1 Answer 1

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Your mistake is then you convert to instance, you convert all separated pieces into one big instance. Instead, try following:

You can rotate this blocks by tilting the curves and change height by scaling it:

enter image description here

I've also used capture attribute to make a random value generated per spline

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  • $\begingroup$ thank you so much. This is simple and elegant solution and it does exactly what I need it to. $\endgroup$
    – kurnikoff
    Commented Mar 14, 2022 at 12:44
  • $\begingroup$ How do we randomize with rotation of these half cylinders inside a cube?. $\endgroup$
    – saded
    Commented May 3, 2022 at 13:46

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