39 lines
1.3 KiB
GLSL
39 lines
1.3 KiB
GLSL
/**
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* Gets the color with fog at a distance from the camera.
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*
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* @name czm_fog
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* @glslFunction
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*
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* @param {float} distanceToCamera The distance to the camera in meters.
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* @param {vec3} color The original color.
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* @param {vec3} fogColor The color of the fog.
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*
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* @returns {vec3} The color adjusted for fog at the distance from the camera.
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*/
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vec3 czm_fog(float distanceToCamera, vec3 color, vec3 fogColor)
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{
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float scalar = distanceToCamera * czm_fogDensity;
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float fog = 1.0 - exp(-(scalar * scalar));
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return mix(color, fogColor, fog);
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}
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/**
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* Gets the color with fog at a distance from the camera.
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*
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* @name czm_fog
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* @glslFunction
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*
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* @param {float} distanceToCamera The distance to the camera in meters.
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* @param {vec3} color The original color.
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* @param {vec3} fogColor The color of the fog.
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* @param {float} fogModifierConstant A constant to modify the appearance of fog.
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*
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* @returns {vec3} The color adjusted for fog at the distance from the camera.
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*/
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vec3 czm_fog(float distanceToCamera, vec3 color, vec3 fogColor, float fogModifierConstant)
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{
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float scalar = distanceToCamera * czm_fogDensity;
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float fog = 1.0 - exp(-((fogModifierConstant * scalar + fogModifierConstant) * (scalar * (1.0 + fogModifierConstant))));
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return mix(color, fogColor, fog);
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}
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