直接使用Three.js的 Shape和ExtrudeGeometry创建带孔几何体实现挖孔效果
我们可以通过直接使用Three.js的 Shape 和 ExtrudeGeometry 来创建带孔的几何体，然后将其合并到一个立方体几何体中来实现挖孔效果，而不使用第三方库。以下是一个示例代码：
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<html><head><title>Three.js Shape with Holes Created By JoyNop.COM</title><style>body { margin: 0; }canvas { display: block; }</style></head><body><script type="module">import * as THREE from 'https://cdn.skypack.dev/three@0.150.1';// Scene setupconst scene = new THREE.Scene();const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);const renderer = new THREE.WebGLRenderer();renderer.setSize(window.innerWidth, window.innerHeight);document.body.appendChild(renderer.domElement);// Create a shape with a holeconst shape = new THREE.Shape();shape.moveTo(0, 0);shape.lineTo(4, 0);shape.lineTo(4, 4);shape.lineTo(0, 4);shape.lineTo(0, 0);const hole = new THREE.Path();hole.moveTo(1, 1);hole.lineTo(3, 1);hole.lineTo(3, 3);hole.lineTo(1, 3);hole.lineTo(1, 1);shape.holes.push(hole);const extrudeSettings = { depth: 2, bevelEnabled: false };const shapeGeometry = new THREE.ExtrudeGeometry(shape, extrudeSettings);const shapeMaterial = new THREE.MeshBasicMaterial({ color: 0x00ff00 });const shapeMesh = new THREE.Mesh(shapeGeometry, shapeMaterial);// Create a cubeconst cubeGeometry = new THREE.BoxGeometry(4, 4, 4);const cubeMaterial = new THREE.MeshBasicMaterial({ color: 0xff0000, wireframe: true });const cubeMesh = new THREE.Mesh(cubeGeometry, cubeMaterial);// Position the shape so it intersects with the cubeshapeMesh.position.set(-2, -2, -1);// Add the shape and cube to the scenescene.add(cubeMesh);scene.add(shapeMesh);// Camera positioncamera.position.z = 10;// Render loopfunction animate() {requestAnimationFrame(animate);cubeMesh.rotation.x += 0.01;cubeMesh.rotation.y += 0.01;shapeMesh.rotation.x += 0.01;shapeMesh.rotation.y += 0.01;renderer.render(scene, camera);}animate();</script></body>
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在这个示例中，我们创建了一个带孔的形状，并将其挤出成几何体。然后我们创建了一个立方体，并将带孔的几何体和立方体添加到场景中。通过调整位置和旋转，可以直观地看到挤出的带孔形状与立方体的相对位置。
虽然这段代码没有使用布尔运算来直接“挖孔”，但你可以通过调整位置和深度，使得带孔形状部分覆盖立方体，从而实现类似的视觉效果。如果你需要真正的布尔运算以移除立方体的部分，你可能需要使用三方库，因为Three.js本身并不直接支持复杂的布尔运算。