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My hair particle system always spawns sideways like in the picture.

What to do?

enter image description here

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This is normal. Some people create their source object/group lying down so that it's upright when Blender uses it, so you could simply rotate your source object.

However, you can fix it in the Particle System settings. Select the particle system tab and find the Rotation section. There is a setting "Initial Orientation", which is probably set to "None" or "Velocity/Hair". Try changing this to "Global Z". (depending on the orientation of your original object, you might need to use a different one).

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  • $\begingroup$ For information, I think the documentation is incorrect here docs.blender.org/manual/en/dev/physics/particles/emitter/… as it should be "Sets the initial rotation of the particle by aligning the Y axis in the direction of" $\endgroup$ – lemon Jul 31 at 12:55
  • $\begingroup$ I have a feeling that in earlier versions of Blender, it was aligned with Y, but was later changed to X, but don't quote me on that! It may be that this change was overlooked in the documentation. $\endgroup$ – Phil Rogers Jul 31 at 13:32

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