<script setup lang="ts">
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import { onBeforeUnmount, onMounted, reactive, ref, watch } from "vue";
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import { AimOutlined, BorderTopOutlined, ReloadOutlined, RotateRightOutlined } from "@ant-design/icons-vue";
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import * as THREE from "three";
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import { OrbitControls } from "three/examples/jsm/controls/OrbitControls.js";
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import { GLTFLoader } from "three/examples/jsm/loaders/GLTFLoader.js";
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const props = withDefaults(defineProps<{ source: string; surface: "textured" | "geometry" | "point_colors" }>(), { surface: "textured" });
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const host = ref<HTMLDivElement | null>(null);
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const loading = ref(true);
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const error = ref<string | null>(null);
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const triangleCount = ref(0);
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const wireframe = ref(false);
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const pivotPicking = ref(false);
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const orientationOpen = ref(false);
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const orientation = reactive({ x: 0, y: 0, z: 0 });
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const orientationAxes = [{ key: "x" as const, label: "X" }, { key: "y" as const, label: "Y" }, { key: "z" as const, label: "Z" }];
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let renderer: THREE.WebGLRenderer | null = null;
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let scene: THREE.Scene | null = null;
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let camera: THREE.PerspectiveCamera | null = null;
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let controls: OrbitControls | null = null;
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let model: THREE.Group | null = null;
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let resizeObserver: ResizeObserver | null = null;
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let animationFrame = 0;
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let requestId = 0;
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function resize() { if (!host.value || !renderer || !camera) return; const width = Math.max(host.value.clientWidth, 1); const height = Math.max(host.value.clientHeight, 1); renderer.setSize(width, height, false); camera.aspect = width / height; camera.updateProjectionMatrix(); }
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function frame() { if (renderer && scene && camera && controls) { controls.update(); renderer.render(scene, camera); } animationFrame = requestAnimationFrame(frame); }
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function modelCentre() { return model ? model.localToWorld(new THREE.Vector3()) : null; }
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function modelSphere() { return model ? new THREE.Box3().setFromObject(model).getBoundingSphere(new THREE.Sphere()) : null; }
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function resetView() {
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if (!camera || !controls || !model) return;
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const sphere = modelSphere(); const centre = modelCentre(); if (!sphere || !centre) return;
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const radius = Math.max(sphere.radius, 0.01);
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controls.target.copy(centre); controls.minDistance = radius * 0.08; controls.maxDistance = radius * 8;
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camera.position.copy(centre).add(new THREE.Vector3(radius * 1.2, radius * 0.8, radius * 1.65));
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camera.near = Math.max(radius / 1_000, 0.01); camera.far = radius * 100; camera.updateProjectionMatrix(); controls.update();
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}
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function topDownView() {
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if (!camera || !controls || !model) return;
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const sphere = modelSphere(); const centre = modelCentre(); if (!sphere || !centre) return;
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const radius = Math.max(sphere.radius, 0.01); const distance = Math.max(camera.position.distanceTo(controls.target), radius * 1.5);
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controls.target.copy(centre); camera.up.set(0, 1, 0);
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camera.position.copy(centre).add(new THREE.Vector3(0, 0, 1).applyQuaternion(model.quaternion).multiplyScalar(distance));
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camera.near = Math.max(radius / 1_000, 0.01); camera.far = radius * 100; camera.updateProjectionMatrix(); controls.update();
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}
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function disposeModel() {
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if (!model || !scene) return;
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model.traverse((node) => {
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if (!(node instanceof THREE.Mesh)) return;
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node.geometry.dispose();
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const materials = Array.isArray(node.material) ? node.material : [node.material];
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materials.forEach((material) => {
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Object.values(material).forEach((value) => { if (value instanceof THREE.Texture) value.dispose(); });
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material.dispose();
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});
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});
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scene.remove(model);
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model = null;
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}
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function applyWireframe() {
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model?.traverse((node) => {
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if (!(node instanceof THREE.Mesh)) return;
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const materials = Array.isArray(node.material) ? node.material : [node.material];
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materials.forEach((material) => { material.wireframe = wireframe.value; material.needsUpdate = true; });
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});
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}
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function preparePreviewMaterials(group: THREE.Group) {
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group.traverse((node) => {
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if (!(node instanceof THREE.Mesh)) return;
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const materials = Array.isArray(node.material) ? node.material : [node.material];
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const previewMaterials = materials.map((material) => {
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const source = material as THREE.MeshStandardMaterial;
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return new THREE.MeshBasicMaterial({
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map: props.surface === "textured" ? source.map ?? null : null,
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color: props.surface === "textured" || props.surface === "point_colors" ? 0xffffff : "#9ba5a8",
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vertexColors: props.surface === "point_colors",
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side: THREE.DoubleSide,
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transparent: source.transparent,
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opacity: source.opacity,
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});
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});
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node.material = Array.isArray(node.material) ? previewMaterials : previewMaterials[0];
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materials.forEach((material) => material.dispose());
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});
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}
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function applyOrientation() { if (model) model.rotation.set(THREE.MathUtils.degToRad(orientation.x), THREE.MathUtils.degToRad(orientation.y), THREE.MathUtils.degToRad(orientation.z), "XYZ"); }
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function resetOrientation() { orientation.x = 0; orientation.y = 0; orientation.z = 0; }
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function togglePivotPicking() { pivotPicking.value = !pivotPicking.value; }
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function pickPivot(event: PointerEvent) {
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if (!renderer || !camera || !model || !controls) return;
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const rect = renderer.domElement.getBoundingClientRect();
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const mouse = new THREE.Vector2(((event.clientX - rect.left) / rect.width) * 2 - 1, -((event.clientY - rect.top) / rect.height) * 2 + 1);
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const raycaster = new THREE.Raycaster(); raycaster.setFromCamera(mouse, camera);
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const hit = raycaster.intersectObject(model, true)[0]; if (hit) controls.target.copy(hit.point); pivotPicking.value = false;
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}
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function handleCanvasPointerDown(event: PointerEvent) { if (!pivotPicking.value || event.button !== 0) return; event.preventDefault(); event.stopImmediatePropagation(); pickPivot(event); }
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function preventMiddleAutoScroll(event: MouseEvent) { if (event.button === 1) event.preventDefault(); }
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function preventContextMenu(event: MouseEvent) { event.preventDefault(); }
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async function loadSource(source: string) {
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const activeId = ++requestId; loading.value = true; error.value = null; pivotPicking.value = false; resetOrientation();
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try {
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const gltf = await new GLTFLoader().loadAsync(source); if (activeId !== requestId || !scene) return;
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disposeModel();
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const content = gltf.scene;
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const centre = new THREE.Box3().setFromObject(content).getCenter(new THREE.Vector3());
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content.position.sub(centre);
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model = new THREE.Group(); model.position.copy(centre); model.add(content);
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preparePreviewMaterials(content);
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triangleCount.value = 0;
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model.traverse((node) => { if (node instanceof THREE.Mesh) triangleCount.value += node.geometry.index ? node.geometry.index.count / 3 : node.geometry.attributes.position.count / 3; });
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scene.add(model); applyOrientation(); applyWireframe(); resetView();
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} catch (caught) { if (activeId === requestId) error.value = caught instanceof Error ? caught.message : "Mesh preview could not be loaded."; }
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finally { if (activeId === requestId) loading.value = false; }
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}
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onMounted(() => {
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if (!host.value) return;
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scene = new THREE.Scene(); scene.background = new THREE.Color("#101821"); scene.add(new THREE.HemisphereLight("#dce9ff", "#273137", 2.1));
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const keyLight = new THREE.DirectionalLight("#ffffff", 2.4); keyLight.position.set(4, 6, 5); scene.add(keyLight);
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camera = new THREE.PerspectiveCamera(42, 1, 0.01, 1_000); renderer = new THREE.WebGLRenderer({ antialias: true, powerPreference: "high-performance" }); renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2)); renderer.outputColorSpace = THREE.SRGBColorSpace; host.value.appendChild(renderer.domElement);
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renderer.domElement.addEventListener("mousedown", preventMiddleAutoScroll, { passive: false }); renderer.domElement.addEventListener("auxclick", preventMiddleAutoScroll, { passive: false }); renderer.domElement.addEventListener("pointerdown", handleCanvasPointerDown); renderer.domElement.addEventListener("contextmenu", preventContextMenu);
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controls = new OrbitControls(camera, renderer.domElement); controls.enableDamping = true; controls.dampingFactor = 0.12; controls.rotateSpeed = 0.55; controls.zoomSpeed = 0.8; controls.panSpeed = 0.75; controls.screenSpacePanning = true; controls.minPolarAngle = 0.04; controls.maxPolarAngle = Math.PI - 0.04; controls.mouseButtons = { LEFT: THREE.MOUSE.ROTATE, MIDDLE: THREE.MOUSE.PAN, RIGHT: THREE.MOUSE.ROTATE };
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resizeObserver = new ResizeObserver(resize); resizeObserver.observe(host.value); resize(); frame(); void loadSource(props.source);
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});
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watch(() => props.source, (source) => { void loadSource(source); });
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watch(() => props.surface, () => { if (props.source) void loadSource(props.source); });
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watch(wireframe, applyWireframe);
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watch(orientation, applyOrientation, { deep: true });
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onBeforeUnmount(() => {
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cancelAnimationFrame(animationFrame); resizeObserver?.disconnect(); renderer?.domElement.removeEventListener("mousedown", preventMiddleAutoScroll); renderer?.domElement.removeEventListener("auxclick", preventMiddleAutoScroll); renderer?.domElement.removeEventListener("pointerdown", handleCanvasPointerDown); renderer?.domElement.removeEventListener("contextmenu", preventContextMenu); disposeModel(); controls?.dispose(); renderer?.dispose(); renderer?.domElement.remove();
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});
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</script>
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<template>
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<div class="textured-mesh-viewer">
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<div ref="host" class="canvas-host" :class="{ 'pivot-picking': pivotPicking }" aria-label="Mesh interactive view" />
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<div class="viewer-toolbar">
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<span>{{ Math.round(triangleCount).toLocaleString() }} 面</span>
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<a-checkbox v-model:checked="wireframe">线框</a-checkbox>
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<a-popover v-model:open="orientationOpen" title="模型朝向" trigger="click"><template #content><div class="orientation-controls"><label v-for="axis in orientationAxes" :key="axis.key">{{ axis.label }}<a-slider v-model:value="orientation[axis.key]" :min="0" :max="360" :step="1" /><a-input-number v-model:value="orientation[axis.key]" :min="0" :max="360" :precision="0" addon-after="度" /></label><a-button size="small" @click="resetOrientation">重置</a-button></div></template><a-tooltip title="模型朝向"><a-button type="text" aria-label="模型朝向"><RotateRightOutlined /></a-button></a-tooltip></a-popover>
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<a-tooltip title="设置旋转中心后，在模型上点击"><a-button :type="pivotPicking ? 'primary' : 'text'" aria-label="设置旋转中心" @click="togglePivotPicking"><AimOutlined /></a-button></a-tooltip>
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<a-tooltip title="俯视模型"><a-button type="text" aria-label="俯视模型" @click="topDownView"><BorderTopOutlined /></a-button></a-tooltip>
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<a-tooltip title="复位视角"><a-button type="text" aria-label="复位视角" @click="resetView"><ReloadOutlined /></a-button></a-tooltip>
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</div>
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<div v-if="loading || error" class="viewer-state" :class="{ error }">{{ error || "正在加载网格模型..." }}</div>
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</div>
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</template>
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<style scoped>
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.textured-mesh-viewer { position: relative; height: 500px; overflow: hidden; border: 1px solid #243342; background: #101821; }
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.canvas-host { width: 100%; height: 100%; }
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.canvas-host.pivot-picking { cursor: crosshair; }
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.canvas-host :deep(canvas) { display: block; width: 100%; height: 100%; touch-action: none; }
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.viewer-toolbar { position: absolute; right: 12px; top: 12px; display: flex; align-items: center; gap: 8px; padding: 5px 8px; color: #eef5f8; background: rgba(9, 18, 26, 0.78); }
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.viewer-toolbar :deep(.ant-checkbox-wrapper), .viewer-toolbar :deep(.ant-btn) { color: #eef5f8; }
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.orientation-controls { display: grid; gap: 8px; min-width: 250px; }
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.orientation-controls label { display: grid; grid-template-columns: 16px 1fr 84px; align-items: center; gap: 8px; }
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.orientation-controls :deep(.ant-slider) { margin: 0; }
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.orientation-controls :deep(.ant-input-number-group-wrapper) { width: 84px; }
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.viewer-state { position: absolute; inset: 0; display: grid; place-items: center; padding: 24px; color: #eef5f8; background: rgba(16, 24, 33, 0.7); text-align: center; }
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.viewer-state.error { color: #ffd7cf; }
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@media (max-width: 767px) { .textured-mesh-viewer { height: 360px; } .viewer-toolbar { left: 8px; right: 8px; flex-wrap: wrap; } }
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</style>
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