I thought this was an amazing video demonstration of 3D Projection Mapping being used as a backdrop during a live show presentation.
This process works by projecting imagery onto a multidimensional light colored plane. The light colored plane is first replicated in 3D software to match its contours.
This is the wikipedia explanation to this process : http://en.wikipedia.org/wiki/3D_projection
How To Page: Project On 3DGeometry