Add existing to tracked

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

@@ -0,0 +1,48 @@
+#ifdef INSTANCED
+in vec2 direction;
+#endif
+in vec4 positionHighAndScaleX;
+in vec4 positionLowAndScaleY;
+in vec4 packedAttribute0;
+in vec4 packedAttribute1;
+in vec4 color;
+
+out vec2 v_offset;
+out vec3 v_maximumSize;
+out vec4 v_color;
+out float v_slice;
+out float v_brightness;
+
+void main() {
+    // Unpack attributes.
+    vec3 positionHigh = positionHighAndScaleX.xyz;
+    vec3 positionLow = positionLowAndScaleY.xyz;
+    vec2 scale = vec2(positionHighAndScaleX.w, positionLowAndScaleY.w);
+
+    float show = packedAttribute0.x;
+    float brightness = packedAttribute0.y;
+    vec2 coordinates = packedAttribute0.wz;
+    vec3 maximumSize = packedAttribute1.xyz;
+    float slice = packedAttribute1.w;
+
+#ifdef INSTANCED
+    vec2 dir = direction;
+#else
+    vec2 dir = coordinates;
+#endif
+
+    vec2 offset = dir - vec2(0.5, 0.5);
+    vec2 scaledOffset = scale * offset;
+    vec4 p = czm_translateRelativeToEye(positionHigh, positionLow);
+    vec4 positionEC = czm_modelViewRelativeToEye * p;
+    positionEC.xy += scaledOffset;
+    
+    positionEC.xyz *= show;
+    gl_Position = czm_projection * positionEC;
+
+    v_offset = offset;
+    v_maximumSize = maximumSize;
+    v_color = color;
+    v_slice = slice;
+    v_brightness = brightness;
+}