凸面体
2019-11-12 本文已影响0人
Codifier
<!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：
总结：
创建ConvexGeometry之前需要引入ConvexGeometry.js和ConvexHull.js。
