Texturing Tools
There is no known 3-D paint available on linux.
Well, there's Texture paint. I've never tried it. It's a gimp plugin that understands models in the quake model format. From the page: "You can directly modify the texture image and view the result in the 3D window, or you can paint on a "screen shot" of the 3D window and Texture Paint calculates the texture image for you." --[Ringtones]?
Research Links
- Octree texture painting - useful for painting on unparameterized surfaces - http://www.thrownclear.com/octex/ they are about to release their code as open source. There is copy of their siggraph paper at: http://www.thrownclear.com/octex_siggraph2002.pdf