Eric Gooch of Insomniac has an excellent tutorial on Creating the Lighting for Resistance: Fall of Man. The best part of the tutorial are the “before and after” shots that show how each scene looks lit and unlit. A lot of people underestimate the importance of good lighting, but these pictures really help make it clear. Well worth the read!
This plugin exports your AC3D file into NMF format, the native input format of the ATI NormalMapper utility. NormalMapper allows you to generate normal maps, bent normals and ambient occlusion maps suitable for use in video games and other realtime 3D applications.
If you aren’t familiar with normal maps, normal maps are a way to make your low-polygon model look more detailed by encoding surface information from a high-polygon version of the same model into a texture map. Ben Cloward has an excellent tutorial where you can learn more.
This plug-in requires the free NormalMapper utility available from AMD in order to process the output files. The companion NormalMapperUI (Stand Alone) available at the same location is also helpful, but not required.
Download the plugin. (Requires Windows XP, AC3D 6.2 or above.)
Ambient occlusion is a lighting technique that is commonly used to create soft shadows on objects. Ambient occlusion isn’t used to create the type of shadows that are cast from objects with a light shining directly on them. Instead, ambient occlusion generates the type of deep shadows that appear in the corners or creases of things, where it is hard for the light to reach.
Technically speaking, ambient occlusion is a global illumination technique. However, in common usage of the term it is often referred to as a cheap alternative to global illumination. To clear up any confusion, what most renderers refer to as “global illumination” is actually an amalgamation of several techniques such as radiosity, metropolis light transport, image-based lighting or photon mapping. The actual techniques used differ slightly from renderer to renderer. Some renderers include an ambient occlusion term as part of their global illumination calculation; others do not.
Like most global illumination techniques, ambient occlusion is dependent on the other geometry in the scene. Ambient occlusion on its own generates less realistic lighting than “full” global illumination. However, ambient occlusion is much faster and less complex to calculate than other methods which is why it is still popular among game developers and in production animation.
(Left) Without Ambient Occlusion. (Right) With Ambient Occlusion
Click for larger image.