https://github.com/WWBN/AVideo/issues/8713

node_modules/three/examples/js/utils/SceneUtils.js

@@ -0,0 +1,59 @@
+THREE.SceneUtils = {
+
+	createMeshesFromInstancedMesh: function ( instancedMesh ) {
+
+		var group = new THREE.Group();
+
+		var count = instancedMesh.count;
+		var geometry = instancedMesh.geometry;
+		var material = instancedMesh.material;
+
+		for ( var i = 0; i < count; i ++ ) {
+
+			var mesh = new THREE.Mesh( geometry, material );
+
+			instancedMesh.getMatrixAt( i, mesh.matrix );
+			mesh.matrix.decompose( mesh.position, mesh.quaternion, mesh.scale );
+
+			group.add( mesh );
+
+		}
+
+		group.copy( instancedMesh );
+		group.updateMatrixWorld(); // ensure correct world matrices of meshes
+
+		return group;
+
+	},
+
+	createMultiMaterialObject: function ( geometry, materials ) {
+
+		var group = new THREE.Group();
+
+		for ( var i = 0, l = materials.length; i < l; i ++ ) {
+
+			group.add( new THREE.Mesh( geometry, materials[ i ] ) );
+
+		}
+
+		return group;
+
+	},
+
+	detach: function ( child, parent, scene ) {
+
+		console.warn( 'THREE.SceneUtils: detach() has been deprecated. Use scene.attach( child ) instead.' );
+
+		scene.attach( child );
+
+	},
+
+	attach: function ( child, scene, parent ) {
+
+		console.warn( 'THREE.SceneUtils: attach() has been deprecated. Use parent.attach( child ) instead.' );
+
+		parent.attach( child );
+
+	}
+
+};