From eb0544e083b8e26ef2541ecb72dc5d7000d6f31d Mon Sep 17 00:00:00 2001
From: syuilo <4439005+syuilo@users.noreply.github.com>
Date: Mon, 16 Feb 2026 11:14:53 +0900
Subject: [PATCH] Update engine.ts

---
 packages/frontend/src/utility/room/engine.ts | 24 +++++++++++++-------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/packages/frontend/src/utility/room/engine.ts b/packages/frontend/src/utility/room/engine.ts
index 1b8f4827cb..67df1874fd 100644
--- a/packages/frontend/src/utility/room/engine.ts
+++ b/packages/frontend/src/utility/room/engine.ts
@@ -75,6 +75,20 @@ export function defineObject<Options extends Record<string, any>>(def: ObjectDef
 	return def;
 }
 
+// この実装方法だとマイナスの座標をうまく処理できず結果がおかしくなるので応急処置で全体を+10000cmオフセットしてから計算している
+function getMeshesBoundingBox(meshes: BABYLON.Mesh[]): BABYLON.BoundingBox {
+	let min = new BABYLON.Vector3(Number.MAX_VALUE, Number.MAX_VALUE, Number.MAX_VALUE);
+	let max = new BABYLON.Vector3(Number.MIN_VALUE, Number.MIN_VALUE, Number.MIN_VALUE);
+
+	for (const mesh of meshes) {
+		const boundingInfo = mesh.getBoundingInfo();
+		min = BABYLON.Vector3.Minimize(min, boundingInfo.boundingBox.minimumWorld.add(new BABYLON.Vector3(10000, 10000, 10000)));
+		max = BABYLON.Vector3.Maximize(max, boundingInfo.boundingBox.maximumWorld.add(new BABYLON.Vector3(10000, 10000, 10000)));
+	}
+
+	return new BABYLON.BoundingBox(min.subtract(new BABYLON.Vector3(10000, 10000, 10000)), max.subtract(new BABYLON.Vector3(10000, 10000, 10000)));
+}
+
 export class RoomEngine {
 	private canvas: HTMLCanvasElement;
 	private engine: BABYLON.Engine;
@@ -354,7 +368,8 @@ export class RoomEngine {
 				const oid = pickingInfo.pickedMesh.metadata.objectId;
 				if (oid != null && this.objectMeshs.has(oid)) {
 					const o = this.objectMeshs.get(oid)!;
-					this.camera.setTarget(o.getChildMeshes()[0].getBoundingInfo().boundingBox.centerWorld);
+					const boundingInfo = getMeshesBoundingBox(o.getChildMeshes());
+					this.camera.setTarget(boundingInfo.center);
 					this.selectObject(oid);
 				}
 			}
@@ -756,18 +771,11 @@ export class RoomEngine {
 
 		root.addChild(subRoot);
 
-		//if (_DEV_) root.showBoundingBox = true;
-
 		root.position = new BABYLON.Vector3(...o.position);
 		root.rotation = new BABYLON.Vector3(o.rotation[0], -o.rotation[1], o.rotation[2]);
 		root.metadata = metadata;
 
 		const meshUpdated = (meshes: BABYLON.Mesh[]) => {
-			// バウンディングボックスを計算
-			// (バウンディングボックスはそのオブジェクトの中心に視点を向ける際などに使用される)
-			const bv = root.getHierarchyBoundingVectors();
-			root.setBoundingInfo(new BABYLON.BoundingInfo(bv.min, bv.max));
-
 			for (const m of meshes) {
 				const mesh = m;