<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ???<script src="js/Three.js"></script> ???<script src="js/Stats.js"></script> ???<script src="js/tween.min.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(){ ???????????//透视投影相机THREE.PerspectiveCamera ????????????camera = new THREE.PerspectiveCamera(45,width/height,1,10000); ???????????//正投影相机THREE.OrthographicCamera ???????????//camera = new THREE.OrthographicCamera( window.innerWidth / - 2, window.innerWidth / 2, window.innerHeight / 2, window.innerHeight / - 2, 10, 1000 ); ???????????camera.position.x=0; ???????????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(){ ???????????light=new THREE.AmbientLight(0xFF0000); ???????????light.position.set(100,100,200); ???????????scene.add(light); ???????????light=new THREE.PointLight(0xFF0000); ???????????light.position.set(100,100,200); ???????????scene.add(light); ???????} ???????var cube; ???????function initObject(){ ???????????var geometry=new THREE.CylinderGeometry(70,100,200); ???????????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 animation(){ ???????????changeFov(); ???????????renderer.render(scene, camera); ???????????requestAnimationFrame(animation); ???????} ???????function setCameraFov(fov){ ???????????camera.fov = fov; ???????????//视角fov：这个最难理解,我的理解是,眼睛睁开的角度,即,视角的大小,如果设置为0, ????????????// ??????相当你闭上眼睛了,所以什么也看不到,如果为180,那么可以认为你的视界很广阔, ????????????// ??????但是在180度的时候，往往物体很小，因为他在你的整个可视区域中的比例变小了。 ???????????camera.updateProjectionMatrix(); ???????} ???????function changeFov(){ ???????????var txtFov = document.getElementById("txtFov").value; ???????????var val = parseFloat(txtFov); ???????????setCameraFov(val); ???????} ???????function threeStart() { ???????????initThree(); ???????????initCamera(); ???????????initScene(); ???????????initLight(); ???????????initObject(); ???????????animation(); ???????} ???</script></head><body onload="threeStart();"><div></div><div id="canvas-frame"></div><div> ???Fov:<input type="text" value="45" id="txtFov"/>(0到180的值) ???<p> ???????视角fov：这个最难理解,我的理解是,眼睛睁开的角度,即,视角的大小,如果设置为0, <br> ??????????????相当你闭上眼睛了,所以什么也看不到,如果为180,那么可以认为你的视界很广阔,<br> ??????????????但是在180度的时候，往往物体很小，因为他在你的整个可视区域中的比例变小了。 ???</p></div></body></html>
<!DOCTYPE html>
<html lang="en">
<head>
???<meta charset="UTF-8">
???<title>Title</title>
???<script src="js/Three.js"></script>
???<script src="js/Stats.js"></script>
???<script src="js/tween.min.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(){
//透视投影相机THREE.PerspectiveCamera
camera = new THREE.PerspectiveCamera(45,width/height,1,10000);
//正投影相机THREE.OrthographicCamera
???????????//camera = new THREE.OrthographicCamera( window.innerWidth / - 2, window.innerWidth / 2, window.innerHeight / 2, window.innerHeight / - 2, 10, 1000 );
camera.position.x=0;
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(){
light=new THREE.AmbientLight(0xFF0000);
light.position.set(100,100,200);
scene.add(light);
light=new THREE.PointLight(0xFF0000);
light.position.set(100,100,200);
scene.add(light);
???????}
var cube;
function initObject(){
var geometry=new THREE.CylinderGeometry(70,100,200);
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 animation(){
changeFov();
renderer.render(scene, camera);
requestAnimationFrame(animation);
???????}
function setCameraFov(fov){
camera.fov = fov;
//视角fov：这个最难理解,我的理解是,眼睛睁开的角度,即,视角的大小,如果设置为0,
????????????// ??????相当你闭上眼睛了,所以什么也看不到,如果为180,那么可以认为你的视界很广阔,
????????????// ??????但是在180度的时候，往往物体很小，因为他在你的整个可视区域中的比例变小了。
camera.updateProjectionMatrix();
???????}
function changeFov(){
var txtFov = document.getElementById("txtFov").value;
var val = parseFloat(txtFov);
setCameraFov(val);
???????}
function threeStart() {
initThree();
initCamera();
initScene();
initLight();
initObject();
animation();
???????}
</script>
</head>
<body onload="threeStart();">
<div></div>
<div id="canvas-frame"></div>
<div>
Fov:<input type="text" value="45" id="txtFov"/>(0到180的值)
<p>
视角fov：这个最难理解,我的理解是,眼睛睁开的角度,即,视角的大小,如果设置为0, <br>
相当你闭上眼睛了,所以什么也看不到,如果为180,那么可以认为你的视界很广阔,<br>
但是在180度的时候，往往物体很小，因为他在你的整个可视区域中的比例变小了。
</p>
</div>
</body>
</html>
threejs学习笔记05---相机透视-正透视
原文地址：http://www.cnblogs.com/Webyangbowen/p/8058890.html