<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Custom Geometry</title>
<script src="../../three-part/threejs/three.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 = -20;
camera.position.y = 25;
camera.position.z = 20;
camera.lookAt(new THREE.Vector3(5, 0, 0));
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 a plane
let planeGeometry = new THREE.PlaneGeometry(60, 40, 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;
scene.add(plane);
// add ambient lighting
let ambientLight = new THREE.AmbientLight(0x555555);
scene.add(ambientLight);
let vertices = [
new THREE.Vector3(1, 3, 1),
new THREE.Vector3(1, 3, -1),
new THREE.Vector3(1, -1, 1),
new THREE.Vector3(1, -1, -1),
new THREE.Vector3(-1, 3, -1),
new THREE.Vector3(-1, 3, 1),
new THREE.Vector3(-1, -1, -1),
new THREE.Vector3(-1, -1, 1)
];
let faces = [
new THREE.Face3(0, 2, 1),
new THREE.Face3(2, 3, 1),
new THREE.Face3(4, 6, 5),
new THREE.Face3(6, 7, 5),
new THREE.Face3(4, 5, 1),
new THREE.Face3(5, 0, 1),
new THREE.Face3(7, 6, 2),
new THREE.Face3(6, 3, 2),
new THREE.Face3(5, 7, 0),
new THREE.Face3(7, 2, 0),
new THREE.Face3(1, 3, 4),
new THREE.Face3(3, 6, 4),
];
let geometry = new THREE.Geometry();
geometry.vertices = vertices;
geometry.faces = faces;
geometry.computeFaceNormals();
let material = new THREE.MeshLambertMaterial({opacity: 0.6, color: 0x44ff44, transparent: true});
let mesh = new THREE.Mesh(geometry, material);
mesh.castShadow = true;
console.log(mesh);
scene.add(mesh);
// add spotlight
let spotLight = new THREE.SpotLight(0xffffff, 1, 180, Math.PI / 4);
spotLight.shadow.mapSize.height = 2048;
spotLight.shadow.mapSize.width = 2048;
spotLight.position.set(-40, 30, 30);
spotLight.castShadow = true;
spotLight.lookAt(mesh);
scene.add(spotLight);
// attributes which can be modified in GUI
const controls = {
"vertex_0" : getPosition(3, 5, 3),
"vertex_1" : getPosition(3, 5, 0),
"vertex_2" : getPosition(3, 0, 3),
"vertex_3" : getPosition(3, 0, 0),
"vertex_4" : getPosition(0, 5, 0),
"vertex_5" : getPosition(0, 5, 3),
"vertex_6" : getPosition(0, 0, 0),
"vertex_7" : getPosition(0, 0, 3)
};
// init GUI
initGUI();
renderScene();
function getPosition(x, y, z){
return {
"x" : x,
"y" : y,
"z" : z
}
}
function initGUI(){
let gui = new dat.GUI();
for(let i=0; i<8; ++i){
let folder = gui.addFolder("Vertex[" + (i+1) + "]");
folder.add(controls["vertex_"+i], "x", -10, 10);
folder.add(controls["vertex_"+i], "y", -10, 10);
folder.add(controls["vertex_"+i], "z", -10, 10);
}
}
function onResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function renderScene(){
trackballControls.update(clock.getDelta());
stats.update();
let vertexes = [];
for(let i=0; i<8; ++i){
vertexes.push(new THREE.Vector3(controls["vertex_"+i].x, controls["vertex_"+i].y, controls["vertex_"+i].z));
}
mesh.geometry.vertices = vertexes;
mesh.geometry.verticesNeedUpdate = true;
mesh.geometry.computeFaceNormals();
// 必须删掉这个属性，否则修改后不生效
delete mesh.geometry.__directGeometry;
requestAnimationFrame(renderScene);
renderer.render(scene, camera);
}
}
</script>
</body>
</html>
运行结果：
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