Add existing to tracked

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

@@ -0,0 +1,17 @@
+in vec3 position3DHigh;
+in vec3 position3DLow;
+in vec3 normal;
+in float batchId;
+
+out vec3 v_positionEC;
+out vec3 v_normalEC;
+
+void main()
+{
+    vec4 p = czm_computePosition();
+
+    v_positionEC = (czm_modelViewRelativeToEye * p).xyz;      // position in eye coordinates
+    v_normalEC = czm_normal * normal;                         // normal in eye coordinates
+
+    gl_Position = czm_modelViewProjectionRelativeToEye * p;
+}