199 lines
7.0 KiB
Vue
199 lines
7.0 KiB
Vue
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<script setup lang="ts">
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import type { Material, Mesh } from 'three';
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import type { SectionBlock } from '~/types/site';
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import { resolveAssetUrl } from '~/utils/resolveAssetUrl';
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/**
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* 3D 模型展示布局（model3d）
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*
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* config 字段：
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* - model_url：GLB 模型路径（素材库上传，.glb/.gltf）
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* - model_height：展示区高度 px（默认 480）
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* - auto_rotate：是否自动旋转（默认开）
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*
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* three.js 通过动态 import 懒加载：滚动到视口内才初始化，
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* 未命中 3D 区块的页面零开销。渲染器透明背景，跟随区块背景/主题。
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*/
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const props = defineProps<{ section: SectionBlock }>();
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const { overline, title, subtitle, config, isDark, overlineStyle, titleStyle, bodyStyle } = useSectionContent(props.section);
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const modelUrl = computed(() => resolveAssetUrl((config.value.model_url as string) || ''));
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const viewerHeight = computed(() => {
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const h = Number(config.value.model_height);
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return `${Number.isFinite(h) && h >= 200 ? h : 480}px`;
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});
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const autoRotate = computed(() => (config.value.auto_rotate as boolean) !== false);
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const containerRef = ref<HTMLDivElement | null>(null);
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const status = ref<'idle' | 'loading' | 'ready' | 'error'>('idle');
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// 可见后才动态加载 three 并初始化，避免拖慢首屏
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const { stop: stopObserve } = useIntersectionObserver(
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containerRef,
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entries => {
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const entry = entries[0];
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if (entry?.isIntersecting && status.value === 'idle' && modelUrl.value) {
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status.value = 'loading';
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stopObserve();
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initViewer();
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}
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},
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{ rootMargin: '200px' }
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);
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async function initViewer() {
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if (!containerRef.value || !modelUrl.value) return;
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try {
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// 动态 import：three 相关代码拆分为独立 chunk，按需加载
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const [THREE, { GLTFLoader }, { OrbitControls }] = await Promise.all([
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import('three'),
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import('three/addons/loaders/GLTFLoader.js'),
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import('three/addons/controls/OrbitControls.js')
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]);
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const container = containerRef.value;
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const width = container.clientWidth;
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const height = container.clientHeight;
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const renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true });
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renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
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renderer.setSize(width, height);
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renderer.toneMapping = THREE.ACESFilmicToneMapping;
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container.appendChild(renderer.domElement);
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const scene = new THREE.Scene();
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const camera = new THREE.PerspectiveCamera(45, width / height, 0.1, 1000);
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// 基础布光：半球光 + 主方向光 + 补光，无环境贴图也能呈现合理质感
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scene.add(new THREE.HemisphereLight(0xffffff, 0x333333, 2.2));
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const keyLight = new THREE.DirectionalLight(0xffffff, 2.5);
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keyLight.position.set(3, 5, 4);
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scene.add(keyLight);
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const fillLight = new THREE.DirectionalLight(0xffffff, 0.8);
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fillLight.position.set(-4, 1, -3);
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scene.add(fillLight);
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const loader = new GLTFLoader();
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const gltf = await loader.loadAsync(modelUrl.value);
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const model = gltf.scene;
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scene.add(model);
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// 按包围球自动居中并适配相机距离
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const box = new THREE.Box3().setFromObject(model);
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const sphere = box.getBoundingSphere(new THREE.Sphere());
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const radius = sphere.radius || 1;
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model.position.sub(sphere.center);
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const dist = radius * 2.8;
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camera.position.set(dist * 0.6, dist * 0.4, dist);
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camera.near = radius / 100;
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camera.far = radius * 100;
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camera.updateProjectionMatrix();
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const controls = new OrbitControls(camera, renderer.domElement);
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controls.enableDamping = true;
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controls.dampingFactor = 0.08;
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controls.enablePan = false;
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controls.minDistance = radius * 1.4;
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controls.maxDistance = radius * 6;
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controls.autoRotate = autoRotate.value;
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controls.autoRotateSpeed = 1.5;
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status.value = 'ready';
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let rafId = 0;
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const animate = () => {
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rafId = requestAnimationFrame(animate);
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controls.update();
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renderer.render(scene, camera);
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};
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animate();
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// 容器尺寸变化时同步渲染器与相机
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const ro = new ResizeObserver(() => {
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const w = container.clientWidth;
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const h = container.clientHeight;
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if (w > 0 && h > 0) {
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renderer.setSize(w, h);
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camera.aspect = w / h;
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camera.updateProjectionMatrix();
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}
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});
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ro.observe(container);
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// 记录清理句柄，卸载时释放 WebGL 资源
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cleanup = () => {
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cancelAnimationFrame(rafId);
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ro.disconnect();
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controls.dispose();
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model.traverse(obj => {
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const mesh = obj as Mesh;
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if (mesh.isMesh) {
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mesh.geometry.dispose();
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const mats = Array.isArray(mesh.material) ? mesh.material : [mesh.material];
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mats.forEach((m: Material) => m.dispose());
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}
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});
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renderer.dispose();
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renderer.domElement.remove();
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};
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} catch (e) {
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console.error('[model3d] 3D 模型加载失败', e);
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status.value = 'error';
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}
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}
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let cleanup: (() => void) | null = null;
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onBeforeUnmount(() => {
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stopObserve();
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cleanup?.();
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});
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</script>
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<template>
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<div class="section-container py-[var(--sec-py,96px)]">
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<!-- 标题区 -->
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<div v-if="overline || title || subtitle" class="text-center max-w-640px mx-auto mb-56px">
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<p v-if="overline" class="text-14px font-semibold tracking-widest uppercase" :class="isDark ? 'text-primary-300' : 'text-primary'" :style="overlineStyle">
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{{ overline }}
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</p>
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<h2 class="mt-12px font-bold" :class="isDark ? 'text-white' : 'text-gray-900 dark:text-white'" :style="titleStyle">
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{{ title }}
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</h2>
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<p v-if="subtitle" class="mt-16px text-base" :class="isDark ? 'text-gray-400' : 'text-gray-500 dark:text-gray-400'" :style="bodyStyle">
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{{ subtitle }}
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</p>
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</div>
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<!-- 3D 展示区：透明背景跟随区块背景 -->
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<div
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ref="containerRef"
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class="relative w-full overflow-hidden rounded-16px touch-none select-none"
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:style="{ height: viewerHeight }"
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>
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<!-- 加载占位 -->
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<div v-if="status !== 'ready'" class="absolute inset-0 flex flex-col items-center justify-center gap-12px">
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<template v-if="status === 'error'">
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<span class="text-14px" :class="isDark ? 'text-gray-400' : 'text-gray-500'">3D 模型加载失败</span>
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</template>
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<template v-else-if="!modelUrl">
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<span class="text-14px" :class="isDark ? 'text-gray-400' : 'text-gray-500'">未配置 3D 模型</span>
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</template>
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<template v-else>
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<div class="h-24px w-24px animate-spin rounded-full border-2px border-gray-300 border-t-transparent" />
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<span class="text-14px" :class="isDark ? 'text-gray-400' : 'text-gray-500'">模型加载中…</span>
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</template>
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</div>
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<!-- 交互提示 -->
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<div
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v-if="status === 'ready'"
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class="absolute bottom-12px left-1/2 -translate-x-1/2 rounded-full bg-black/40 px-12px py-4px text-12px text-white backdrop-blur"
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>
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拖拽旋转 · 滚轮缩放
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</div>
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</div>
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</div>
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</template>
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