Portal 2 Sky List
From Valve Developer Community
These skyboxes are available to Portal 2 and mods utilizing its content. These skies are HDR capable. Go to Map Properties and change "SkyBox Texture Name" to whatever sky you want. An env_fog_controller is also recommended.
|Skies and environment maps||Skybox (2D) • Skybox (3D) • HDR Skies • Skybox with Terragen • Skybox with Terragen - Advanced • List of skies|
|Terrain and displacement mapping||Displacements • Holes in displacements • Digital Elevation Models|