Camera texture

A camera texture is an advanced feature offered by some source ports in which the view from a specific camera is projected on a surface, be it a wall or a ceiling.

Camera textures can be quite resource-intensive, especially if multiple ones are involved, or if there is some recursion going on.

Perhaps one of the earliest computer games in general to involve something similar to a camera texture was Duke Nukem 3D.

Source ports with cameras

 * Vavoom
 * ZDoom and derivatives