Add existing to tracked

node_modules/@cesium/engine/Source/Shaders/GroundAtmosphere.glsl

@@ -0,0 +1,18 @@
+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
+    );
+}