From 4254268f8d3b88f8f79caa323402a99182802880 Mon Sep 17 00:00:00 2001
From: syuilo <4439005+syuilo@users.noreply.github.com>
Date: Wed, 15 Apr 2026 12:14:27 +0900
Subject: [PATCH] TransformNode

---
 packages/frontend/src/utility/room/engine.ts | 22 ++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/packages/frontend/src/utility/room/engine.ts b/packages/frontend/src/utility/room/engine.ts
index d6e6fa2834..30167df46a 100644
--- a/packages/frontend/src/utility/room/engine.ts
+++ b/packages/frontend/src/utility/room/engine.ts
@@ -1168,8 +1168,10 @@ export class RoomEngine extends EventEmitter<RoomEngineEvents> {
 		const filePath = def.path != null ? `/client-assets/room/objects/${def.path}.glb` : `/client-assets/room/objects/${camelToKebab(args.type)}/${camelToKebab(args.type)}.glb`;
 		const loaderResult = await BABYLON.LoadAssetContainerAsync(filePath, this.scene);
 
+		const allMeshes = loaderResult.meshes;
+
 		// babylonによって自動で追加される右手系変換用ノード
-		const subRoot = loaderResult.meshes[0] as BABYLON.Mesh;
+		let subRoot = allMeshes[0] as BABYLON.TransformNode;
 
 		if (BAKE_TRANSFORM) {
 			subRoot.scaling = new BABYLON.Vector3(1, 1, 1);
@@ -1186,7 +1188,7 @@ export class RoomEngine extends EventEmitter<RoomEngineEvents> {
 				//m.parent = root;
 				}
 			}
-			for (const m of loaderResult.meshes) {
+			for (const m of allMeshes) {
 				if (m.name === '__root__') continue;
 				if (m.parent === subRoot) {
 					m.setParent(root);
@@ -1297,7 +1299,19 @@ export class RoomEngine extends EventEmitter<RoomEngineEvents> {
 
 			subRoot.dispose();
 		} else {
-			subRoot.scaling = subRoot.scaling.scale(WORLD_SCALE);// cmをmに
+			// meshじゃなくtransform nodeにしてパフォーマンス向上
+			const _subRoot = new BABYLON.TransformNode('__root__', this.scene);
+			_subRoot.scaling.x = -1;
+			_subRoot.scaling = _subRoot.scaling.scale(WORLD_SCALE);// cmをmに
+
+			for (const m of subRoot.getChildren()) {
+				if (m.parent === subRoot) {
+					m.parent = _subRoot;
+				}
+			}
+
+			subRoot.dispose();
+			subRoot = _subRoot;
 		}
 
 		def.treatLoaderResult?.(loaderResult);
@@ -1320,7 +1334,7 @@ export class RoomEngine extends EventEmitter<RoomEngineEvents> {
 		root.rotation = args.rotation.clone();
 		root.metadata = metadata;
 
-		const model = new ModelManager(BAKE_TRANSFORM ? root : subRoot, loaderResult.meshes.filter(m => m.name !== subRoot), (meshes) => {
+		const model = new ModelManager(BAKE_TRANSFORM ? root : subRoot, allMeshes.filter(m => m.name !== '__root__'), (meshes) => {
 			if (this.selected?.objectId === args.id) {
 				this.highlightMeshes(meshes);
 			}