Hi Gaieus!

Yes, your comment is relevant, I've learned about triangulated faces and UV mapping in the hard way (failing and failing LOL). I have Tig's plugin just for this

And I have to add: the model has to be very clean, and MeshLab is useful checking this too, if you don't see the model in the right way in MeshLab, you're going to have problems editing and exporting the .obj.

(Is this thread about whaat's plugin or I'm posting in the wrong place?)

I know my method is a little tricky, if someone have an easier way for mac and free software, I'm reading.

Thank you!

Well, first post, and I must say I don't speak english, so sorry for the mistakes and thanks for your understanding.

The thing is after some days trying and trying this UV thing and being a noob using free software, I found this solution. I'm a happy woman now, and I want to share it
I hope this can be useful for someone

1- paint the surface with the texture and export to .obj with UVTools
2- open the .obj with MeshLab and resave it
3- open it in Blender and edit the UV map (haaaaaarrrrddddddd)
4- export to .obj
5- open it again with MeshLab, and save it as .3ds
6- impot this .3ds in sketchup

I don't know what others uses this MeshLab have, but it's useful for avoiding this "Blender not importing UVTools .obj", and this issue I have with faces bad mapped importing the .obj with UVTools. It seems to handle a lot of 3d formats, but I have to say I'm learning, and doing some simple stuff as cups, apples, and so.

Tested in Kerkythea and everything seems to be ok (with SU2KT 3.16, the new one don't export the simple UVMapped textures spherical or cylindrical)

And thank you all people for sharing your plugins, you're doing Sketchup a great and fun app!!!