[Geometry Nodes] Rotate instances around local Z axis not working

[Raphaëlle Joffray]

Hello there !

While doing the carrousel exercise for the ASSEMBLE tutorial, i encountered an unexpected problem, a.k.a “it was supposed to be an easy thing to do, but it’s not”.

So i have this model :

I would like each tube to be able to rotate along its own Z axis, so that the tags do not all share the same rotation.

The logical step was to “Rotate instances”, chose “local space” and rotate along the Z axis (then using a Random Value > To Radians > Combine XYZ – Z socket > Rotation)

But it doesn’t work as intended :

It works correctly with the Y axis, but behaves weirdly with the X and Z axis.
Do you have any idea why ? How can i make my tube instances rotate correctly around their Z axis ?

[Martin Bergwerf]

Hi @koala ,

Those Nodes you are showing us, seem to work fine, so it might be caused by something else…maybe the Origin of those Instances???

I don’t know, I’d have to see the .blend file.

[Raphaëlle Joffray]

Here’s a link to the .blend file 🙂 :

https://drive.google.com/file/d/1Mfb4qqnVQOHfR6xcLXwSrbYnGn_eQy–/view?usp=sharing

[Martin Bergwerf]

Hi, thank you for the file!

If you Instance a Cube instead, you can see the problem:

These Cubes rotate correctly, so the Tubes use those locations as Pivot Point. You could correct that by changing the Y to something near -0.4m (you’ll probably know the exact number). There are probably other places you could change something to make it work, but that is up to you now.

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