Add existing to tracked

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

@@ -0,0 +1,33 @@
+in vec3 position3DHigh;
+in vec3 position3DLow;
+in vec3 prevPosition3DHigh;
+in vec3 prevPosition3DLow;
+in vec3 nextPosition3DHigh;
+in vec3 nextPosition3DLow;
+in vec2 expandAndWidth;
+in vec2 st;
+in float batchId;
+
+out float v_width;
+out vec2 v_st;
+out float v_polylineAngle;
+
+void main()
+{
+    float expandDir = expandAndWidth.x;
+    float width = abs(expandAndWidth.y) + 0.5;
+    bool usePrev = expandAndWidth.y < 0.0;
+
+    vec4 p = czm_computePosition();
+    vec4 prev = czm_computePrevPosition();
+    vec4 next = czm_computeNextPosition();
+
+    float angle;
+    vec4 positionWC = getPolylineWindowCoordinates(p, prev, next, expandDir, width, usePrev, angle);
+    gl_Position = czm_viewportOrthographic * positionWC;
+
+    v_width = width;
+    v_st.s = st.s;
+    v_st.t = czm_writeNonPerspective(st.t, gl_Position.w);
+    v_polylineAngle = angle;
+}