Hmmm...a cubemap is a 6 sided texture that is applied to entity's to give the impression of a reflective world. It's like putting a cube textured with six different textures, and wrapping it to an entity. You can have a couple of cubemap modes to. One that acts like sphereical reflection.
I'm sure someone will be along to explain this better, but that's the basics of it :)
I'm sure someone will be along to explain this better, but that's the basics of it :)