Applying an image texture to several faces - beware:new user
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Unfortunately this "wrapping" method doesn't always work flawlessly. You apply the image on the very first facet (have hidden geometry ON) and position it to your needs.
Now if you sample this positioned material, turn hidden geometry OFF and apply it on the curved surface, it should wrap around without any problem but that's not always the case.
If it gets screwed, you need to turn hidden geometry on again and start sampling and painting the facets one by one hoping that after a while, when you already hate it enough and turn hidden geometry off again and try to apply the material to the rest of the surface, it will work.
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Thanks a lot for the work, boys, and for your patience. I'll relate step-by-step my doings, so you could put your finger on my mistake:
- In the upload.skp I uploaded previously, I created a flat plane with the exact measures the element should have, which are, according to my driving dimensions, 490,3 (the old measure was a mistake on my part, sorry) x 2372 mm. Then I created a unique texture from it (it gives me different measures for the size of the image in the unique texture, but I hope that's not the problem).
- Then I scale the curve element to fit that dimensions.
- Toggle on Hidden Geometry, select one face, apply the unique texture. Texture > Position (I do not just enter here, it may be relevant, as I have to reposition the image), and then I select with the dropper this applied texture. Toggle off Hidden Geometry, and apply the texture.
My results are in the file, I'm afraid I made a mistake somewhere, but I can't find it...
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Darn it, I would really like to see some kind of 3D mesh painting tool inside SketchUp...
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Yes, practically that should do it but I see you have it screwed up just like I described above. In this case, you cannot do anything but start sampling and painting each facet one by one.
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We'll have to try that
anyway, I'd preferred it was a error on my side 
Thanks a lot for the great help, I'll keep you posted of my progess with sketchup! -
As with mostly everything, the best is to try it out on a bit simpler model (less "irregular" curved face, less segments etc.) but then I also understand that once you are doing it, you wish to do it on a "real" model, real challenge.
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Hmm, it seems that Sk0tchup has some uv mapping functions under the hood. I tested this and I was amazed... Until now I thought just projecting was the only way to put a texture on a curved surface...
It's a pity this uv capabilities are not better implemented
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