Template:Skybox lighting

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Toolsskybox.gif
Skybox Lighting enters the map through every toolsskybox-textured brush, representing direct sun/moonlight and diffuse skylight. Its basic properties are controlled by three entities used in combination (four in some games):
  • light_environment defines the direction, color and intensity of the direct sunlight, and the color and intensity of the diffuse skylight.
  • shadow_control defines the color, direction, and attenuation distance of the dynamic shadows that are created by light_environment. Dynamic shadows will be buggy and unconfigurable without this entity.
  • env_sun places a glowing sprite in the skybox to represent the Sun's apparent position in the sky.
  • env_cascade_light casts harsh, real-time shadows onto the map, usually copying settings from the light_environment. <Counter-Strike: Global Offensive><Insurgency><Black Mesa (Source)> only.

To make sense of it all, just make sure you have only one of each of these entities in your map, and that the Pitch and Yaw <angles> are set the same for all three of them. (Pitch is equivalent to the Sun's angle of elevation from the ground, and Yaw is its compass bearing.)

These lighting settings - direction, color, brightness, etc are fairly specific to the actual image used for the 2D skybox. The Sky List article suggests some settings for official game skyboxes. The worldspawn entity defines which skybox to use. Also note that fog will look wrong if env_fog_controller's settings don't correspond to the particular skybox in use.

Note:Pitch can be overriden for light_environment and env_sun, but not shadow_control. The Pitch override also cannot be switched off and its rotation is measured counter-clockwise from the horizontal (so straight down is -90°) whereas the <angles> Pitch's rotation is clockwise (so straight down is +90°). The workaround for this is to make sure your Pitch override merely repeats the <angles> value; for example, if your shadow_control, light_environment and env_sun <angles> are "45 -60 0", set the Pitch override to "-45".