Add existing to tracked

node_modules/@cesium/engine/Source/Scene/findTileMetadata.js

@@ -0,0 +1,53 @@
+import Frozen from "../Core/Frozen.js";
+import defined from "../Core/defined.js";
+import hasExtension from "./hasExtension.js";
+import TileMetadata from "./TileMetadata.js";
+import oneTimeWarning from "../Core/oneTimeWarning.js";
+
+/**
+ * Check if a tile has metadata, either defined in its metadata field (3D Tiles 1.1)
+ * or in the <code>3DTILES_metadata</code> extension. If defined, get the tile metadata
+ * with the corresponding class.
+ * <p>
+ * This assumes that tileset.metadata has been created before any tiles are constructed.
+ * </p>
+ * @function
+ *
+ * @param {Cesium3DTileset} tileset The tileset to query for tile metadata
+ * @param {object} tileHeader the JSON header for a {@link Cesium3DTile}
+ * @return {TileMetadata} the tile metadata, or <code>undefined</code> if not found
+ * @private
+ * @experimental This feature is using part of the 3D Tiles spec that is not final and is subject to change without Cesium's standard deprecation policy.
+ */
+function findTileMetadata(tileset, tileHeader) {
+  const metadataJson = hasExtension(tileHeader, "3DTILES_metadata")
+    ? tileHeader.extensions["3DTILES_metadata"]
+    : tileHeader.metadata;
+
+  if (!defined(metadataJson)) {
+    return undefined;
+  }
+
+  if (!defined(tileset.schema)) {
+    findTileMetadata._oneTimeWarning(
+      "findTileMetadata-missing-root-schema",
+      "Could not find a metadata schema for tile metadata. For tilesets that contain external tilesets, make sure the schema is added to the root tileset.json.",
+    );
+    return undefined;
+  }
+
+  const classes = tileset.schema.classes ?? Frozen.EMPTY_OBJECT;
+  if (defined(metadataJson.class)) {
+    const tileClass = classes[metadataJson.class];
+    return new TileMetadata({
+      tile: metadataJson,
+      class: tileClass,
+    });
+  }
+
+  return undefined;
+}
+
+// Exposed for testing
+findTileMetadata._oneTimeWarning = oneTimeWarning;
+export default findTileMetadata;