In the following example, you start with an eyeball model (see Chapter 5) that you may have added basic materials to (see Chapter 7). (If you didn't do those examples, you can find the file on the book's companion DVD.) While the model looks pretty good, you can provide an additional splash of realism to it. In particular, you can get a much more detailed iris, and you can add some of the fine blood vessels around the white section of the eye.
Start this example by opening your eye .blend file or the one included in this book's companion DVD in Blender and switch to the UV Editing screen layout.
This example starts with marking your seams. Select your eye object and tab into Edit mode. With this model, you don't really need to be concerned with texturing the faces on the cornea/sclera. Because you don't have to worry about texturing those faces, you also don't need to be overly concern with unwrapping them. That being the case, if the faces for the cornea/sclera of your eye mesh are visible, make sure that no faces are selected and then select the faces that form the cornea by hovering your mouse over one of them and pressing L. Then hide those faces (H). Now you can focus on the part of the eye that really needs the detailed texture.
To make selection easier, you may want to enable ...