Add existing to tracked

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

@@ -0,0 +1,28 @@
+in vec2 direction;
+
+uniform float u_size;
+
+out vec2 v_textureCoordinates;
+
+void main() 
+{
+    vec4 position;
+    if (czm_morphTime == 1.0)
+    {
+        position = vec4(czm_sunPositionWC, 1.0);
+    }
+    else
+    {
+        position = vec4(czm_sunPositionColumbusView.zxy, 1.0);
+    }
+    
+    vec4 positionEC = czm_view * position;
+    vec4 positionWC = czm_eyeToWindowCoordinates(positionEC);
+    
+    vec2 halfSize = vec2(u_size * 0.5);
+    halfSize *= ((direction * 2.0) - 1.0);
+    
+    gl_Position = czm_viewportOrthographic * vec4(positionWC.xy + halfSize, -positionWC.z, 1.0);
+    
+    v_textureCoordinates = direction;
+}