54 Three.js 使用THREE.PointCloudMaterial(新版本:THREE.PointsMaterial)樣式化粒子
阿新 • • 發佈:2019-02-10
var renderer;
function initRender() {
renderer = new THREE.WebGLRenderer({antialias: true});
//renderer.setClearColor(new THREE.Color(0xEEEEEE, 1.0)); //設定背景顏色
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
}
var camera;
function initCamera() {
camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 10000);
camera.position.set(0, 0, 200);
}
var scene;
function initScene() {
scene = new THREE.Scene();
}
var light;
function initLight() {
scene.add(new THREE.AmbientLight(0x404040));
light = new THREE.DirectionalLight(0xffffff);
light.position.set(1, 1, 1);
scene.add(light);
}
var cloud;
function initModel() {
//軸輔助 (每一個軸的長度)
var object = new THREE.AxesHelper(500);
scene.add(object);
//建立THREE.PointCloud粒子的容器
var geometry = new THREE.Geometry();
//建立THREE.PointCloud紋理
var material = new THREE.PointCloudMaterial({size: 4, vertexColors: true, color: 0xffffff});
//迴圈將粒子的顏色和位置新增到網格當中
for (var x = -5; x <= 5; x++) {
for (var y = -5; y <= 5; y++) {
var particle = new THREE.Vector3(x * 10, y * 10, 0);
geometry.vertices.push(particle);
geometry.colors.push(new THREE.Color(+randomColor()));
}
}
//例項化THREE.PointCloud
cloud = new THREE.PointCloud(geometry, material);
scene.add(cloud);
}
//隨機生成顏色
function randomColor() {
var arrHex = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"],
strHex = "0x",
index;
for (var i = 0; i < 6; i++) {
index = Math.round(Math.random() * 15);
strHex += arrHex[index];
}
return strHex;
}
//初始化效能外掛
var stats;
function initStats() {
stats = new Stats();
document.body.appendChild(stats.dom);
}
//使用者互動外掛 滑鼠左鍵按住旋轉,右鍵按住平移,滾輪縮放
var controls;
function initControls() {
controls = new THREE.OrbitControls(camera, renderer.domElement);
// 如果使用animate方法時,將此函式刪除
//controls.addEventListener( 'change', render );
// 使動畫迴圈使用時阻尼或自轉 意思是否有慣性
controls.enableDamping = true;
//動態阻尼係數 就是滑鼠拖拽旋轉靈敏度
//controls.dampingFactor = 0.25;
//是否可以縮放
controls.enableZoom = true;
//是否自動旋轉
controls.autoRotate = false;
//設定相機距離原點的最遠距離
controls.minDistance = 20;
//設定相機距離原點的最遠距離
controls.maxDistance = 10000;
//是否開啟右鍵拖拽
controls.enablePan = true;
}
//生成gui設定配置項
var gui;
function initGui() {
//宣告一個儲存需求修改的相關資料的物件
gui = {
"size": 4,
"transparent": true,
"opacity": 0.6,
"vertexColors": true,
"color": 0xffffff,
"sizeAttenuation": true,
"rotateSystem": true,
redraw: function () {
if (cloud) {
scene.remove(cloud);
}
createParticles(gui.size, gui.transparent, gui.opacity, gui.vertexColors, gui.sizeAttenuation, gui.color);
//設定是否自動旋轉
controls.autoRotate = gui.rotateSystem;
}
};
var datGui = new dat.GUI();
//將設定屬性新增到gui當中,gui.add(物件,屬性,最小值,最大值)gui.add(controls, 'size', 0, 10).onChange(controls.redraw);
datGui.add(gui, 'transparent').onChange(gui.redraw);
datGui.add(gui, 'opacity', 0, 1).onChange(gui.redraw);
datGui.add(gui, 'vertexColors').onChange(gui.redraw);
datGui.addColor(gui, 'color').onChange(gui.redraw);
datGui.add(gui, 'sizeAttenuation').onChange(gui.redraw);
datGui.add(gui, 'rotateSystem').onChange(gui.redraw);
gui.redraw();
}
//生成粒子的方法
function createParticles(size, transparent, opacity, vertexColors, sizeAttenuation, color) {
//存放粒子資料的網格
var geom = new THREE.Geometry();
//樣式化粒子的THREE.PointCloudMaterial材質
var material = new THREE.PointCloudMaterial({
size: size,
transparent: transparent,
opacity: opacity,
vertexColors: vertexColors,
sizeAttenuation: sizeAttenuation,
color: color
});
var range = 500;
for (var i = 0; i < 15000; i++) {
var particle = new THREE.Vector3(Math.random() * range - range / 2, Math.random() * range - range / 2, Math.random() * range - range / 2);
geom.vertices.push(particle);
var color = new THREE.Color(+randomColor());
//.setHSL ( h, s, l ) h — 色調值在0.0和1.0之間 s — 飽和值在0.0和1.0之間 l — 亮度值在0.0和1.0之間。 使用HSL設定顏色。
//隨機當前每個粒子的亮度
color.setHSL(color.getHSL().h, color.getHSL().s, Math.random() * color.getHSL().l);
geom.colors.push(color);
}
//生成模型,新增到場景當中
cloud = new THREE.PointCloud(geom, material);
scene.add(cloud);
}
function render() {
renderer.render(scene, camera);
}
//視窗變動觸發的函式
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
render();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function animate() {
//更新控制器
controls.update();
render();
//更新效能外掛
stats.update();
requestAnimationFrame(animate);
}
function draw() {
initRender();
initScene();
initCamera();
initLight();
initModel();
initControls();
initStats();
initGui();
animate();
window.onresize = onWindowResize;
}