凸面体

作者: Codifier | 来源:发表于2019-11-12 16:37 被阅读0次

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Convex Geometry</title>
    <script src="../../three-part/threejs/three.js"></script>
    <script src="../../three-part/threejs/ConvexGeometry.js"></script>
    <script src="../../three-part/threejs/ConvexHull.js"></script>
    <script src="../../three-part/utils/stats.min.js"></script>
    <script src="../../three-part/utils/dat.gui.min.js"></script>
    <script src="../controls/TrackballControls.js"></script>
    <script src="../util/util.js"></script>
    <style>
        body {
            margin: 0;
            overflow: hidden;
        }
    </style>
</head>
<body>
<div id="container"></div>
<script type="text/javascript">
    init();
    function init() {
        // show FPS
        let stats = initStats();
        // resize
        window.addEventListener('resize', onResize, false);

        let scene = new THREE.Scene();
        let camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);
        camera.position.x = -30;
        camera.position.y = 40;
        camera.position.z = 30;
        camera.lookAt(scene.position);

        let renderer = new THREE.WebGLRenderer();
        renderer.setClearColor(new THREE.Color(0x000000));
        renderer.setSize(window.innerWidth, window.innerHeight);
        renderer.shadowMap.enabled = true;
        document.getElementById("container").appendChild(renderer.domElement);

        // init trackball control
        let trackballControls = initTrackballControls(camera, renderer);
        let clock = new THREE.Clock();

        // add ambient light
        let ambientLight = new THREE.AmbientLight("#606008", 1);
        scene.add(ambientLight);

        let directionalLight = new THREE.DirectionalLight("#ffffff");
        directionalLight.position.set(-10, 50, -10);
        directionalLight.intensity = 2;
        directionalLight.castShadow = true;
        scene.add(directionalLight);

        // add a plane
        let planeGeometry = new THREE.PlaneGeometry(100, 100, 1, 1);
        let planeMaterial = new THREE.MeshLambertMaterial({
            color: 0xffffff
        });
        let plane = new THREE.Mesh(planeGeometry, planeMaterial);
        plane.receiveShadow = true;
        plane.rotation.x = -0.5 * Math.PI;
        plane.position.set(0, -20, 0);
        scene.add(plane);

        let group = null;
        generateConvex(group);

        // attributes which can be modified in GUI
        const controls = {

        };
        // init GUI
        initGUI();

        renderScene();

        function initGUI(){
            let gui = new dat.GUI();
        }

        function generateConvex(group) {
            if (group) scene.remove(group);
            // random point
            let points = [];
            for (let i = 0; i < 20; i++) {
                let randomX = -15 + Math.round(Math.random() * 30);
                let randomY = -15 + Math.round(Math.random() * 30);
                let randomZ = -15 + Math.round(Math.random() * 30);
                points.push(new THREE.Vector3(randomX, randomY, randomZ));
            }
            group = new THREE.Object3D();
            let material = new THREE.MeshBasicMaterial({
                color: 0xff0000,
                transparent: false
            });
            points.forEach(v => {
                let spGeom = new THREE.SphereGeometry(0.2);
                let spMesh = new THREE.Mesh(spGeom, material);
                spMesh.position.copy(v);
                group.add(spMesh);
            });
            scene.add(group);

            /**
             * ConvexGeometry( points : Array )
             * points — Array of Vector3s that the resulting convex hull will contain.
             * @type {THREE.ConvexGeometry}
             */
            let convexGeometry = new THREE.ConvexGeometry(points);
            convexGeometry.computeVertexNormals();
            convexGeometry.computeFaceNormals();
            convexGeometry.normalsNeedUpdate = true;
            let convexMaterial = new THREE.MeshLambertMaterial({
                color: 0x0000ff
            });
            let convexMesh = new THREE.Mesh(convexGeometry, convexMaterial);
            convexMesh.castShadow = true;
            scene.add(convexMesh);
        }

        function onResize() {
            camera.aspect = window.innerWidth / window.innerHeight;
            camera.updateProjectionMatrix();
            renderer.setSize(window.innerWidth, window.innerHeight);
        }

        function renderScene(){
            trackballControls.update(clock.getDelta());
            stats.update();
            requestAnimationFrame(renderScene);
            renderer.render(scene, camera);
        }
    }
</script>
</body>
</html>

运行结果：