Home >Web Front-end >JS Tutorial >Three.js uses the trackball plug-in to increase the interactive function of the model
Trackball is a component of three.js and requires additional import files. The file address is in the official download case examples/js/controls/TrackballControls.js. You only need to set the relevant properties as in the case, and pass in the camera when instantiating. You can achieve interactive effects. This article mainly introduces to you the relevant information on how to use the trackball plug-in in Three.js, that is, trackball to add interactive functions to the model. Friends who need it can take a look below.
Achievable effects:
Hold down the left button of the mouse to rotate the model
Hold the right button of the mouse Drag can move the model
Mouse wheel can zoom the model
Case code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
html, body {
margin: 0;
height: 100%;
}
canvas {
display: block;
}
</style>
</head>
<body onload="draw();">
</body>
<script src="build/three.js"></script>
<script src="examples/js/controls/TrackballControls.js"></script>
<script>
var renderer;
function initRender() {
renderer = new THREE.WebGLRenderer({antialias:true});
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, 400);
}
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);
}
function initModel() {
var map = new THREE.TextureLoader().load("examples/textures/UV_Grid_Sm.jpg");
var material = new THREE.MeshLambertMaterial({map:map});
var cube = new THREE.Mesh(new THREE.BoxGeometry(100, 200, 100, 1, 1, 1), material);
scene.add(cube);
}
//用户交互插件 鼠标左键按住旋转，右键按住平移，滚轮缩放
var controls;
function initControls() {
controls = new THREE.TrackballControls( camera );
//旋转速度
controls.rotateSpeed = 5;
//变焦速度
controls.zoomSpeed = 3;
//平移速度
controls.panSpeed = 0.8;
//是否不变焦
controls.noZoom = false;
//是否不平移
controls.noPan = false;
//是否开启移动惯性
controls.staticMoving = false;
//动态阻尼系数 就是灵敏度
controls.dynamicDampingFactor = 0.3;
//未知，占时先保留
//controls.keys = [ 65, 83, 68 ];
controls.addEventListener( 'change', render );
}
function render() {
renderer.render( scene, camera );
}
//窗口变动触发的函数
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
controls.handleResize();
render();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
//更新控制器
controls.update();
render();
requestAnimationFrame(animate);
}
function draw() {
initRender();
initScene();
initCamera();
initLight();
initModel();
initControls();
animate();
window.onresize = onWindowResize;
}
</script>
</html>
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