### 3.8.12 Atmospheric Effects

Describe various background and atmospheric features
ATMOSPHERIC_EFFECT:
  `MEDIA | BACKGROUND | FOG | SKY_SPHERE | RAINBOW`

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#### 3.8.12.1 Background

Specify a background color for the scene:
BACKGROUND:
  `background { COLOR }`

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#### 3.8.12.2 Fog

Simulate a hazy or foggy atmosphere:
FOG:
  Jump to SDL
  `CONSTANT_FOG | GROUND_FOG`
CONSTANT_FOG:
  `fog { [FOG_IDENTIFIER] [fog_type 1] FOG_ITEMS }`
FOG_ITEMS:
  `distance FLOAT & COLOR & [TURBULENCE [turb_depth FLOAT]]`
GROUND_FOG:
  `fog { [FOG_IDENTIFIER] fog_type 2 GROUND_FOG_ITEMS }`
GROUND_FOG_ITEMS:
  `FOG_ITEMS & fog_offset FLOAT & fog_alt FLOAT & [up VECTOR [TRANSFORMATION...]]`

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#### 3.8.12.3 Sky Sphere

Specify a sky pigment:
SKY_SPHERE:
  `sky_sphere { [SKY_SPHERE_IDENTIFIER] [SKY_SPHERE_ITEM...] }`
SKY_SPHERE_ITEM:
  `PIGMENT | TRANSFORMATION`

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#### 3.8.12.4 Rainbow

Specify a rainbow arc:
RAINBOW:
  Jump to SDL
  `rainbow { [RAINBOW_IDENTIFIER] [RAINBOW_ITEMS] }`
RAINBOW_ITEMS:
  `direction VECTOR & angle FLOAT & width FLOAT & distance FLOAT & COLOR_MAP & [jitter FLOAT] & [up VECTOR] & [arc_angle FLOAT] & [falloff_angle FLOAT]`

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