Modify panel > Select an object. > Modifier List > World-Space Modifiers > * Camera Map
Select an object. > Modifiers menu > UV Coordinates > * Camera Map
The Camera Map world-space modifier is similar to the Camera Map modifier, in that it applies UVW mapping coordinates to the object based on a specified camera. As a result, if you assign the same map as a Screen environment to the background as you apply to the object, the object is invisible in the rendered scene.
The main difference between the world-space version of Camera Map and the object-space version is that, when you move the camera or the object using the object-space version, the object becomes visible, because the UVW coordinates are fixed to the object's local coordinates. When you move the camera or object using the world-space version, the object remains invisible because world coordinates are used instead.
Label—Names the current camera used for mapping. If there is no current camera, reads "None."
Pick Camera—Click this button, and then select the camera you want used for mapping.
Map Channel—Specifies use of a map channel. Map channels are specified in the Material Editor.
Vertex Color Channel—Specifies use of the Vertex Color Channel (see UVW Map Modifier).