Point_camera entities project an image onto a monitor. These can be useful to simulate a TV broadcast, video call, or security camera system. There are three main parts to a point_camera system:
Camera (point_camera)
Monitor (any brush-based entity)
Camera link (info_camera_link)
The point_camera entity is the actual camera. You simply give it a name and aim it at whatever target you want it to look at. The monitor is a special texture that will display the point_camera's image, and the info_camera_link entity specifies which camera is displayed onto the monitor texture. Let's walk through creating a simple security system.
Create a two-room map with a light in each room. In one room, place a point_camera entity and something for it to look at. Name the point_camera entity sec_cam01 and click on the look at button to easily set the camera's target. In my example, I have the camera looking at an npc_antlion.
In the other room, place an info_player_start entity and a television-sized...