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packages/frontend/src/utility/room/objects/book.ts

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+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import * as BABYLON from '@babylonjs/core';
+import { defineObject } from '../engine.js';
+
+export const book = defineObject({
+	id: 'book',
+	defaultOptions: {
+		variation: null as number | null,
+	},
+	placement: 'top',
+	createInstance: ({ room, o, root }) => {
+		return {
+			onInited: () => {
+				const mesh = root.getChildMeshes()[1] as BABYLON.Mesh;
+				mesh.markVerticesDataAsUpdatable(BABYLON.VertexBuffer.UVKind, true);
+				const index = o.options.variation ?? 0;
+				const x = index % 8;
+				const y = Math.floor(index / 8);
+
+				const uvs = mesh.getVerticesData(BABYLON.VertexBuffer.UVKind)!;
+				for (let i = 0; i < uvs.length / 2; i++) {
+					const u = uvs[i * 2];
+					const v = uvs[i * 2 + 1];
+					uvs[i * 2] = (u / 8) + (x / 8);
+					uvs[i * 2 + 1] = (v / 8) + (y / 8);
+				}
+				mesh.updateVerticesData(BABYLON.VertexBuffer.UVKind, uvs);
+			},
+			interactions: {},
+		};
+	},
+});