Well, it works well if the mesh doesn't have sharp, highly angled polygons. Limme see if i can dig it out :o)
The idea behind this, is that sphere maps, basically map the texture onto an entity, like a sphere. Whatever is on the very outside of the texture, will be closest to the outside of the mesh.
The idea behind this, is that sphere maps, basically map the texture onto an entity, like a sphere. Whatever is on the very outside of the texture, will be closest to the outside of the mesh.