<script type="module">
	/* 四面缓冲几何体 TetrahedronGeometry */
	import * as THREE from 'https://esm.sh/three';

	const scene = new THREE.Scene;
	const camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);
	camera.position.set(0, 0, 10);
	const renderer = new THREE.WebGLRenderer({ antialias: true });
	renderer.setSize(window.innerWidth, window.innerHeight);
	document.body.appendChild(renderer.domElement);

	const geometry = new THREE.TetrahedronGeometry(1.2, 0); // 四面体
	const material = new THREE.MeshLambertMaterial({ color: 0x008B8B }); // 朗伯特材质
	const ico = new THREE.Mesh(geometry, material); // 创建网格Mess对象（图像=几何体+材质）
	scene.add(ico); // 图像添加到场景成形
	
	const ambientLight = new THREE.AmbientLight(0xffeeee, 1); // 环境光 : 改善场景视觉
	scene.add(ambientLight);
	
	const dirLight = new THREE.DirectionalLight(0xffd700, 2.5); // 平行光（方向光） : 角度照亮
	dirLight.position.set(-10,10,0); // 光来自右上靠近观者
	dirLight.target = ico; // 光作用的对象 : 四面体图像
	scene.add(dirLight);

	const animate = () => {
		requestAnimationFrame(animate);
		ico.rotation.x += 0.01;
		ico.rotation.y += 0.01;
		renderer.render(scene, camera);
	};

	window.onresize = () => renderer.setSize(window.innerWidth, window.innerHeight);

	animate();

</script>