Prefab allows you to generate normal maps visually with a built-in Normal Map generator interface in no time and then assign them immediately to your model. (For more explanation on normal maps, read in Chapter 1, Working with Away3D Materials, the following recipe Generating normal maps using Away3D NormalMapGenerator). Let's see how to do it.
Repeat the Getting ready steps from the previous recipe.
barrel_empty_low.3ds. Drag-and-drop the model into the Prefab viewport.