Add existing to tracked

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

@@ -0,0 +1,9 @@
+in vec3 position;
+out vec3 v_texCoord;
+
+void main()
+{
+    vec3 p = czm_viewRotation * (czm_temeToPseudoFixed * (czm_entireFrustum.y * position));
+    gl_Position = czm_projection * vec4(p, 1.0);
+    v_texCoord = position.xyz;
+}