Add existing to tracked

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

@@ -0,0 +1,47 @@
+in vec4 v_color;
+in vec4 v_outlineColor;
+in float v_innerPercent;
+in float v_pixelDistance;
+in vec4 v_pickColor;
+in float v_splitDirection;
+
+void main()
+{
+    if (v_splitDirection < 0.0 && gl_FragCoord.x > czm_splitPosition) discard;
+    if (v_splitDirection > 0.0 && gl_FragCoord.x < czm_splitPosition) discard;
+
+    // The distance in UV space from this fragment to the center of the point, at most 0.5.
+    float distanceToCenter = length(gl_PointCoord - vec2(0.5));
+    // The max distance stops one pixel shy of the edge to leave space for anti-aliasing.
+    float maxDistance = max(0.0, 0.5 - v_pixelDistance);
+    float wholeAlpha = 1.0 - smoothstep(maxDistance, 0.5, distanceToCenter);
+    float innerAlpha = 1.0 - smoothstep(maxDistance * v_innerPercent, 0.5 * v_innerPercent, distanceToCenter);
+
+    vec4 color = mix(v_outlineColor, v_color, innerAlpha);
+    color.a *= wholeAlpha;
+
+// Fully transparent parts of the billboard are not pickable.
+#if !defined(OPAQUE) && !defined(TRANSLUCENT)
+    if (color.a < 0.005)   // matches 0/255 and 1/255
+    {
+        discard;
+    }
+#else
+// The billboard is rendered twice. The opaque pass discards translucent fragments
+// and the translucent pass discards opaque fragments.
+#ifdef OPAQUE
+    if (color.a < 0.995)   // matches < 254/255
+    {
+        discard;
+    }
+#else
+    if (color.a >= 0.995)  // matches 254/255 and 255/255
+    {
+        discard;
+    }
+#endif
+#endif
+
+    out_FragColor = czm_gammaCorrect(color);
+    czm_writeLogDepth();
+}