Add existing to tracked

node_modules/@cesium/engine/Source/Shaders/Appearances/EllipsoidSurfaceAppearanceVS.glsl

@@ -0,0 +1,19 @@
+in vec3 position3DHigh;
+in vec3 position3DLow;
+in vec2 st;
+in float batchId;
+
+out vec3 v_positionMC;
+out vec3 v_positionEC;
+out vec2 v_st;
+
+void main()
+{
+    vec4 p = czm_computePosition();
+
+    v_positionMC = position3DHigh + position3DLow;           // position in model coordinates
+    v_positionEC = (czm_modelViewRelativeToEye * p).xyz;     // position in eye coordinates
+    v_st = st;
+
+    gl_Position = czm_modelViewProjectionRelativeToEye * p;
+}