This effect was generated in Filter Forge, a Photoshop plugin that allows you to create your own filters.
Use this filter on a normal map to generate a simulated ambient occlusion (self-shadow) map. You can also create an ambient occlusion map using photos, textures and heightmaps.
Ambient, occlusion, shadow, game, texture, bump, normal, shader.
This filter has earned its author one of our rewards. They are given to the authors of popular filters and include a free copy of Filter Forge.