Sin Episodes Level Creation/Sin Episodes Sky List
From Valve Developer Community
These skyboxes are available to Sin Episodes and mods utilizing its content.

Environment articles: | |
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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 |