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enter image description here

My tree is clearly straight, but painting trees result in sideways ones. What can cause this?

Tree is straight when placed manually as a prefab.

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Looks like its a handedness issue, in 3d graphics the choice of which axis is called what is kind of arbitrary (to a point) and there are a couple of different common standards.

Unity uses the left-handed, Y up, but other software, particularly 3d modeling software like blender, use right-handed, Y or Z up.

Freya Holmér made this really great reference image

Handedness explanation

Realistically the fix is just to transform your model by rotating it, or scaling one dimension by -1, either in unity or in some 3d modeling software, until it looks correct.

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  • \$\begingroup\$ Scaling by -1 alone won't fix the issue in the question, but rotating the z axis to point along y (or something along those lines) should work. \$\endgroup\$
    – DMGregory
    Dec 10, 2020 at 18:48

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