You can import a 3D model into Photoshop (CS4 or better) and paint on it, which is very interesting to try out but is not featured in this book. You can view information about 3D in Photoshop CS5 Extended in the following documentation from Adobe: http://goo.gl/mz0tO. The actual link has been shortened as it contains a very long number.
Some kind of models suit being painted in Photoshop, particularly objects with largely flat surfaces and straight edges, such as low-poly models of logs, tables, shields, or architectural content. A benefit of painting in Photoshop is you can copy and paste imagery into a rendered UV mapping template and very easily control quality or resolution. In the versions of Photoshop available until now, it was a big disadvantage, besides not seeing the update on the model in real time, that for a complex model, reading a UV template in 2D was pretty tricky so it could be hard to know where to paint. Newer versions allow you...