Add existing to tracked

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

@@ -0,0 +1,64 @@
+import ForEach from "./ForEach.js";
+import removeExtensionsUsed from "./removeExtensionsUsed.js";
+import defined from "../../Core/defined.js";
+
+/**
+ * Removes an extension from gltf.extensions, gltf.extensionsUsed, gltf.extensionsRequired, and any other objects in the glTF if it is present.
+ *
+ * @param {object} gltf A javascript object containing a glTF asset.
+ * @param {string} extension The extension to remove.
+ *
+ * @returns {*} The extension data removed from gltf.extensions.
+ */
+function removeExtension(gltf, extension) {
+  removeExtensionsUsed(gltf, extension); // Also removes from extensionsRequired
+
+  if (extension === "CESIUM_RTC") {
+    removeCesiumRTC(gltf);
+  }
+
+  return removeExtensionAndTraverse(gltf, extension);
+}
+
+function removeCesiumRTC(gltf) {
+  ForEach.technique(gltf, function (technique) {
+    ForEach.techniqueUniform(technique, function (uniform) {
+      if (uniform.semantic === "CESIUM_RTC_MODELVIEW") {
+        uniform.semantic = "MODELVIEW";
+      }
+    });
+  });
+}
+
+function removeExtensionAndTraverse(object, extension) {
+  if (Array.isArray(object)) {
+    const length = object.length;
+    for (let i = 0; i < length; ++i) {
+      removeExtensionAndTraverse(object[i], extension);
+    }
+  } else if (
+    object !== null &&
+    typeof object === "object" &&
+    object.constructor === Object
+  ) {
+    const extensions = object.extensions;
+    let extensionData;
+    if (defined(extensions)) {
+      extensionData = extensions[extension];
+      if (defined(extensionData)) {
+        delete extensions[extension];
+        if (Object.keys(extensions).length === 0) {
+          delete object.extensions;
+        }
+      }
+    }
+    for (const key in object) {
+      if (Object.prototype.hasOwnProperty.call(object, key)) {
+        removeExtensionAndTraverse(object[key], extension);
+      }
+    }
+    return extensionData;
+  }
+}
+
+export default removeExtension;