Self shadowed bump map
From polycount
This is a Normal map variant that contains directional ambient occlusion information in the map, used in the Source engine for self-shadowed bump mapping.
Images by Valve Software
Efficient Self-Shadowed Radiosity Normal Mapping white paper by Valve.
SSbump Generator is a tool for generating Self-Shadowed Bump Maps from existing height maps or normal maps.
XNormal can bake SSBump textures from a highpoly source.
