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I have created this sign, but when I added the red texture to the face, the texture turned out sideways. Is there a way to rotate it? The original image is the right way up.

Rotated stop sign

In the texture settings there doesn't seem to be a rotation value. Texture settings

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2 Answers 2

up vote 11 down vote accepted

The way of doing it with simple (non-UV) texture mapping, is to tweak the mapping coordinate and scale.

1a

For example:

  • Switching X and Y axis, and scaling X by -1 will rotate the texture 90 degrees clockwise.
  • Switching X and Y axis, and scaling Y by -1 will rotate the texture 90 degrees counter-clockwise.
  • Scaling X and Y by -1 will flip the image vertically.

But you see that it's quite limiting, less intuitive and flexible than UV-map based rotation, described in gandalf3's answer.

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You need to UV unwrap it:

  1. Enter edit mode and select all (A)

  2. Unwrap the mesh. For that flat plane the best way is probably aligning your view to the face of the sign (shiftNumpad 7 with the face selected) and pressing U> Project from view.

  3. Then select the UV coordinates in Texture > Mapping:

    enter image description here

You should be able to rotate the UV map in the UV image editor with R to adjust the rotation.

See the wiki for more information.

Cycles:

Note that in cycles it's possible to rotate the texture without UV unwrapping via the Mapping node:

enter image description here

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The texture was applied with a material the doesn't seem to be any setting for rotation –  Qwertie Dec 17 '13 at 6:56
    
@qwertie In that case you haven't unwrapped your sign yet. There is a way to rotate it, (I'll update my answer) but I recommend UV unwrapping it (see the wiki). –  gandalf3 Dec 17 '13 at 6:57

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