Sky (Source 2 shader)

Source Engine

Source 2

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June 2026

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Example of Source 2 skybox. sky_hr_aztec_02_lighting from Counter-Strike 2.

Sky is a shader in  Source 2. Unlike Source, skies in Source 2 do not use a 6-sided skybox, but instead a single panoramic image, such as an HDRI map.

Todo:  Counter-Strike 2 supports 6-sided skyboxes, but it uses a single vtex_c instead of one for each face; how are these authored in the  Material Editor?