water-management-system/frontend/node_modules/@cesium/engine/Source/Shaders/GroundAtmosphere.glsl

void computeAtmosphereScattering(vec3 positionWC, vec3 lightDirection, out vec3 rayleighColor, out vec3 mieColor, out float opacity) {

    vec3 cameraToPositionWC = positionWC - czm_viewerPositionWC;
    vec3 cameraToPositionWCDirection = normalize(cameraToPositionWC);
    czm_ray primaryRay = czm_ray(czm_viewerPositionWC, cameraToPositionWCDirection);
    
    float atmosphereInnerRadius = length(positionWC);

    computeScattering(
        primaryRay,
        length(cameraToPositionWC),
        lightDirection,
        atmosphereInnerRadius,
        rayleighColor,
        mieColor,
        opacity
    );
}