<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Override Material</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();
scene.fog = new THREE.FogExp2(0xEA7EF7, 0.01);
// If not null, it will force everything in the scene to be rendered with that material.
// Default is null.
scene.overrideMaterial = new THREE.MeshLambertMaterial({color: 0xffffff});
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 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;
plane.position.x = 0;
plane.position.y = 0;
plane.position.z = 0;
scene.add(plane);
// add a ambient light
let ambientLight = new THREE.AmbientLight(0x3c3c3c);
scene.add(ambientLight);
// add a spot light
let spotLight = new THREE.SpotLight(0xffffff, 1.2, 150, 120);
spotLight.position.set(-40, 60, -10);
spotLight.castShadow = true;
scene.add(spotLight);
// attributes which can be modified in GUI
const controls = {
"rotationSpeed" : 0.02,
"numberOfObjects" : scene.children.length,
"removeCube" : function(){
let allChildren = scene.children;
let lastObject = allChildren[allChildren.length - 1];
if (lastObject instanceof THREE.Mesh) {
scene.remove(lastObject);
this.numberOfObjects = scene.children.length;
}
},
"addCube" : function(){
let cubeSize = Math.ceil((Math.random() * 3));
let cubeGeometry = new THREE.BoxGeometry(cubeSize, cubeSize, cubeSize);
let cubeMaterial = new THREE.MeshLambertMaterial({
color: Math.random() * 0xffffff
});
let cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
cube.castShadow = true;
cube.name = "cube-" + scene.children.length;
cube.position.x = -30 + Math.round((Math.random() * planeGeometry.parameters.width));
cube.position.y = Math.round((Math.random() * 5));
cube.position.z = -20 + Math.round((Math.random() * planeGeometry.parameters.height));
scene.add(cube);
this.numberOfObjects = scene.children.length;
},
"outputObjects" : function(){
console.log(scene.children);
}
};
// init GUI
initGUI(controls);
renderScene();
function initGUI(controls){
let gui = new dat.GUI();
gui.add(controls, 'rotationSpeed', 0, 0.5);
gui.add(controls, 'addCube');
gui.add(controls, 'removeCube');
gui.add(controls, 'outputObjects');
gui.add(controls, 'numberOfObjects').listen();
}
function onResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function renderScene(){
trackballControls.update(clock.getDelta());
stats.update();
// rotate cube
scene.traverse(function (e) {
if (e instanceof THREE.Mesh && e != plane) {
e.rotation.x += controls.rotationSpeed;
e.rotation.y += controls.rotationSpeed;
e.rotation.z += controls.rotationSpeed;
}
});
requestAnimationFrame(renderScene);
renderer.render(scene, camera);
}
}
</script>
</body>
</html>
运行结果：
总结：
scene.overrideMaterial的作用是让场景中的所有物体都具有相同的材质
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