Add existing to tracked

node_modules/@cesium/engine/Source/Scene/GltfPipeline/addPipelineExtras.js

@@ -0,0 +1,36 @@
+import ForEach from "./ForEach.js";
+import defined from "../../Core/defined.js";
+
+/**
+ * Adds extras._pipeline to each object that can have extras in the glTF asset.
+ * This stage runs before updateVersion and handles both glTF 1.0 and glTF 2.0 assets.
+ *
+ * @param {object} gltf A javascript object containing a glTF asset.
+ * @returns {object} The glTF asset with the added pipeline extras.
+ *
+ * @private
+ */
+function addPipelineExtras(gltf) {
+  ForEach.shader(gltf, function (shader) {
+    addExtras(shader);
+  });
+  ForEach.buffer(gltf, function (buffer) {
+    addExtras(buffer);
+  });
+  ForEach.image(gltf, function (image) {
+    addExtras(image);
+  });
+
+  addExtras(gltf);
+
+  return gltf;
+}
+
+function addExtras(object) {
+  object.extras = defined(object.extras) ? object.extras : {};
+  object.extras._pipeline = defined(object.extras._pipeline)
+    ? object.extras._pipeline
+    : {};
+}
+
+export default addPipelineExtras;