Editing Portal (section)

==== Example ====

[[Image:Pskybox01.png]]

(for UDMF, use [[Portal_Define]] with a unique portal ID and the sector '''floorportal''', '''ceilingportal''' and linedef '''portal''' fields.)

This map has a skybox portal applied to the ceiling and wall of the sector with the player start. The "Skybox sector" is the small rectangular one which contains the EESkyboxCam object. The camera object always spawns on the floor, so the skybox sector has been made a glass floor 48 units above the surrounding area so the camera will be above the floor of the box.

[[Image:Pskybox02.png]] [[Image:Pskybox03.png]]

The first image is the view in-game when the player no-clips into the sky box. The second image is the view from inside the main map area with the skybox portal applied. No matter where the player moves inside the map area, the skybox portal will always render from the location of the camera inside the skybox, however, the skybox is rendered from the angle the player is looking. [[ExtraData]] also provides a means of assigning a z-height to objects in maps. This could also be used to raise the skybox camera off the floor. If the skybox camera is left on the floor, the floor plane will not render and result in [[Doom Wiki:HOM|HOM]].

The skybox is not restricted to simple boxes. Any map architecture the skybox camera can see can be part of a skybox. Below is an example of a basic mountainous landscape created with map architecture. 

[[Image:Pskybox04.png]]