在Threejs中,光源用Light表示,它是所有光源的基类。它的构造函数是:
THREE.Light ( hex )
它有一个参数hex,接受一个16进制的颜色值。例如要定义一种红色的光源,我们可以这样来定义:
Var redLight = new THREE.Light(0xFF0000);
Three.js内置了多种光源可以直接调用:
- AmbientLight(环境光)
- AreaLight(区域光)
- DirectionalLight(平行光)
- HemisphereLight(半球光)
- PointLight(点光源)
- SpotLight(聚光灯)
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>我的第一个WebGL程序</title> <style>body { margin: 0; overflow: hidden; }; canvas { width: 100%; height: 100%; }</style> </head> <body> <script src="libs/three.js"></script> <script> //创建场景 var scene = new THREE.Scene(); //创建摄影机 var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 1, 1000); camera.position.set(100, 100, 100); camera.lookAt(scene.position); //创建绿色立方体 var box = new THREE.Mesh( new THREE.CubeGeometry(5, 5, 40), new THREE.MeshLambertMaterial({ color: 0x00ff00 })); box.position.set(10, 20, 10); scene.add(box); //创建红色地面 var ground = new THREE.Mesh( new THREE.CubeGeometry(100, 1, 100), new THREE.MeshLambertMaterial({ color: 0xff0000, })); ground.position.set(0, 5, 0); ground.receiveShadow = true; scene.add(ground); //创建渲染器并把设置背景为蓝色 var renderer = new THREE.WebGLRenderer(); renderer.setSize(window.innerWidth, window.innerHeight); renderer.setClearColor(0x0000ff, 1); document.body.appendChild(renderer.domElement); //渲染画面 renderer.render(scene, camera); </script> </body> </html>
现在运行页面,我们只能看到蓝色的背景和一块黑色的几何体,因为我们还没有加入灯光,所以一切的物体都是黑色的。立方体和地面的材质均为MeshLambertMaterial(类似纸张,可以均匀反射接收到的光线)。
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>我的第一个WebGL程序</title> <style>body { margin: 0; overflow: hidden; }; canvas { width: 100%; height: 100%; }</style> </head> <body> <script src="libs/three.js"></script> <script> //创建场景 var scene = new THREE.Scene(); //创建摄影机 var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 10000); camera.position.set(300, 300, 300); //创建绿色立方体 var box = new THREE.Mesh( new THREE.CubeGeometry(5, 5, 40), new THREE.MeshLambertMaterial({ color: 0x00ff00 })); box.position.set(0, 15, 0); box.castShadow = true; scene.add(box); //创建红色地面 var ground = new THREE.Mesh( new THREE.CubeGeometry(200, 1, 200), new THREE.MeshLambertMaterial({ color: 0xff0000, })); ground.receiveShadow = true; scene.add(ground); //创建渲染器并把设置背景为蓝色 var renderer = new THREE.WebGLRenderer(); renderer.setSize(window.innerWidth, window.innerHeight); renderer.setClearColor(0x0000ff); renderer.shadowMapEnabled = true; document.body.appendChild(renderer.domElement); //添加聚光灯 var light = new THREE.SpotLight( 0xffffff, 3 ); light.position.set( 100, 200, 50 ); light.castShadow = true; light.shadowCameraNear = 50; light.shadowCameraFar = 300; light.shadowCameraFov = 30; scene.add( light ); //渲染画面 var render = function() { requestAnimationFrame(render); box.rotation.y += 0.01; ground.rotation.y += 0.01; camera.lookAt(scene.position); renderer.render(scene, camera); }; render(); </script> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Three框架</title> <script src="libs/three.js"></script> <style type="text/css"> div#canvas-frame { border: none; cursor: pointer; width: 100%; height: 600px; background-color: #EEEEEE; } </style> <script> var renderer; function initThree() { width = document.getElementById(‘canvas-frame‘).clientWidth; height = document.getElementById(‘canvas-frame‘).clientHeight; renderer = new THREE.WebGLRenderer({ antialias : true }); renderer.setSize(width, height); document.getElementById(‘canvas-frame‘).appendChild(renderer.domElement); renderer.setClearColor(0xFFFFFF, 1.0); } var camera; function initCamera() { camera = new THREE.PerspectiveCamera(45, width / height, 1, 10000); camera.position.x = 600; camera.position.y = 0; camera.position.z = 600; camera.up.x = 0; camera.up.y = 1; camera.up.z = 0; camera.lookAt({ x : 0, y : 0, z : 0 }); } var scene; function initScene() { scene = new THREE.Scene(); } var light; function initLight() { } var cube; function initObject() { var geometry = new THREE.CubeGeometry( 200, 100, 50,4,4); var material = new THREE.MeshLambertMaterial( { color:0xFFFFFF} ); var mesh = new THREE.Mesh( geometry,material); mesh.position = new THREE.Vector3(0,0,0); scene.add(mesh); } function threeStart() { initThree(); initCamera(); initScene(); initLight(); initObject(); renderer.clear(); renderer.render(scene, camera); } </script> </head> <body onload="threeStart();"> <div id="canvas-frame"></div> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Three框架</title> <script src="libs/three.js"></script> <style type="text/css"> div#canvas-frame { border: none; cursor: pointer; width: 100%; height: 600px; background-color: #EEEEEE; } </style> <script> var renderer; function initThree() { width = document.getElementById(‘canvas-frame‘).clientWidth; height = document.getElementById(‘canvas-frame‘).clientHeight; renderer = new THREE.WebGLRenderer({ antialias : true }); renderer.setSize(width, height); document.getElementById(‘canvas-frame‘).appendChild(renderer.domElement); renderer.setClearColor(0xFFFFFF, 1.0); } var camera; function initCamera() { camera = new THREE.PerspectiveCamera(45, width / height, 1, 10000); camera.position.x = 600; camera.position.y = 0; camera.position.z = 600; camera.up.x = 0; camera.up.y = 1; camera.up.z = 0; camera.lookAt({ x : 0, y : 0, z : 0 }); } var scene; function initScene() { scene = new THREE.Scene(); } var light; function initLight() { // A start light = new THREE.AmbientLight(0xFF0000); light.position.set(100, 100, 200); scene.add(light); // A end } var cube; function initObject() { var geometry = new THREE.CubeGeometry( 200, 100, 50,4,4); // B start var material = new THREE.MeshLambertMaterial( { color:0x880000} ); // B end var mesh = new THREE.Mesh( geometry,material); mesh.position = new THREE.Vector3(0,0,0); scene.add(mesh); } function threeStart() { initThree(); initCamera(); initScene(); initLight(); initObject(); renderer.clear(); renderer.render(scene, camera); } </script> </head> <body onload="threeStart();"> <div id="canvas-frame"></div> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Three框架</title> <script src="libs/three.js"></script> <style type="text/css"> div#canvas-frame { border: none; cursor: pointer; width: 100%; height: 600px; background-color: #EEEEEE; } </style> <script> var renderer; function initThree() { width = document.getElementById(‘canvas-frame‘).clientWidth; height = document.getElementById(‘canvas-frame‘).clientHeight; renderer = new THREE.WebGLRenderer({ antialias : true }); renderer.setSize(width, height); document.getElementById(‘canvas-frame‘).appendChild(renderer.domElement); renderer.setClearColor(0xFFFFFF, 1.0); } var camera; function initCamera() { camera = new THREE.PerspectiveCamera(45, width / height, 1, 10000); camera.position.x = 600; camera.position.y = 0; camera.position.z = 600; camera.up.x = 0; camera.up.y = 1; camera.up.z = 0; camera.lookAt({ x : 0, y : 0, z : 0 }); } var scene; function initScene() { scene = new THREE.Scene(); } var light; function initLight() { // A start light = new THREE.AmbientLight(0xFF0000); light.position.set(100, 100, 200); scene.add(light); // A end } var cube; function initObject() { var geometry = new THREE.CubeGeometry( 200, 100, 50,4,4); // B start var material = new THREE.MeshLambertMaterial( { color:0x880000} ); // B end var mesh = new THREE.Mesh( geometry,material); mesh.position = new THREE.Vector3(0,0,0); scene.add(mesh); } function threeStart() { initThree(); initCamera(); initScene(); initLight(); initObject(); renderer.clear(); renderer.render(scene, camera); } </script> </head> <body onload="threeStart();"> <div id="canvas-frame"></div> </body> </html>
时间: 2024-10-19 09:24:23