Blender 2.x Camera Projection
till now there are two ways to do camera projection in blender: Sticky textures and UV Projection modifier. Both work well but the way to use those in a bit confusing. Now you can simply press U when you are viewing form your camera and click on the "Projecto from view" option, and blender will generate a map from what are you viewing with your camera, so no more than that!. Then just place a texture and set the coordinates as UV.
