What is the best way to rotate material's images from Ruby?

[DanRathbun]

Have you seen this post ?

Rotate texture, not on a face

The rotation of a texture is not a property of the material. It is either defined by the UV coordinates on a face, or by the pixel data in the image. Unfortunately the SketchUp API has no way to edit pixel data (do image manipulation). You would have to write the texture to an image file, run an external (platform-dependend) program and re-import the image. That is slow, requires disk-IO… If it works for your use case to modify the UV coordinates (= makes changes to the component!, if the user…

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Aerilius also wrote a ImageMagik extension for SketchUp.

GitHub - Aerilius/sketchup-imagemagick: A library to simplify editing of...

… also see his TextureResizer plugin …

https://extensions.sketchup.com/sv/content/texture-resizer