WEBGL学习笔记（七）：实践练手1-飞行类小游戏之游戏控制
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接上一节，游戏控制首先要解决的就是碰撞检测了
这里用到了学习笔记（三）射线检测的内容了
以鸟为射线原点，向前、上、下分别发射3个射线，射线的长度较短大概为10~30.
根据上一节场景的建设，我把y轴设为前进方向，z轴设为高度~
如果射线返回有结果，那么说明鸟遇到了障碍物。代码如下：
var raycaster1 = new THREE.Raycaster(birdmesh.position, new THREE.Vector3(0, 1, 0), 0, 30)
var raycaster2 = new THREE.Raycaster(birdmesh.position, new THREE.Vector3(0, 0, 1), 0, 10)
var raycaster3 = new THREE.Raycaster(birdmesh.position, new THREE.Vector3(0, 0, -1), 0, 10)
//
var intersections1 = raycaster1.intersectObjects(objects);
var intersections2 = raycaster2.intersectObjects(objects);
var intersections3 = raycaster3.intersectObjects(objects);
//如果前方有物体，向前速度为0 if (intersections1.length > 0)
{
velocity.y = 0;
}
//如果上方有物体，向上速度为0或为负值 if (intersections2.length > 0 )
{
if (velocity.z > 0)
{
velocity.z = 0;
}
}
//如果下方有物体，向下速度为0或为正值if (intersections3.length > 0) {
if (velocity.z < 0)
{
velocity.z = 0;
}
}
if (birdmesh.position.z < 10)
{
birdmesh.position.z = 10;
}
if (birdmesh.position.z > 575) {
birdmesh.position.z = 575;
}
if (velocity.y==0)
{
alert(‘您已死亡！‘);
}
其次需要解决的就是飞行前进和重力下降的问题
首先新建一个
var velocity = new THREE.Vector3();
用velocity.x和.y以及.z来表示像3个方向的速度。
y方向为前进方向，给定一个固定值就行，检测到碰撞停止。
x方向不用管，因为x方向没有运动。
z方向为高度方向，要做到鼠标点击飞高一段距离，然后重力下降。
首先鼠标点击给定一个固定的向上的速度，然后速度加速递减（重力效果），代码如下
window.addEventListener(‘mousedown‘, function (event) {
velocity.z = 500;
mixer.clipAction(clip).setDuration(0.1).play();
}, false);
window.addEventListener(‘mouseup‘, function (event) {
mixer.clipAction(clip).setDuration(1).play();
}, false);
var delta = clock.getDelta();
//这里100就是速度的一个因子，数值越大，重力效果越明显;
velocity.z -= 9.8 * 100 * delta;
birdmesh.position.z += velocity.z*delta;
birdmesh.position.y += velocity.y * delta;
velocity.y = 200;
另外上面代码仔细观察，你会发现鼠标点击和松开给定的鸟煽动翅膀的速度是不一样的
mixer.clipAction(clip).setDuration(1).play()
这是为了达到点击鼠标有鸟在努力向上飞的视觉效果~。
先写到这。全部源码先贴在这吧，其实上传工程的效果是最好的，但还没整理好。这个练手还没完！
预告后面两节
后1节：飞行类小游戏转置为win10通用UWP应用（我将上传至微软商店，敬请期待！）
后2节：飞行类小游戏转置为手机安卓应用
最后目前全部源码~
<!DOCTYPE html>
<html lang="en">
<head>
<title>练手</title>
<meta charset="utf-8">
</head>
<body>
<script src="build/three.js"></script>
<script src="js/Detector.js"></script>
<script src="js/controls/OrbitControls.js"></script>
<script>
if (!Detector.webgl) Detector.addGetWebGLMessage();
var camera, scene, renderer;
var clock = new THREE.Clock();
//var controls;var velocity = new THREE.Vector3();
var birdmesh;
var objects = [];
init();
animate();
function init()
{
container = document.createElement( ‘div‘ );
document.body.appendChild( container );
//
camera = new THREE.PerspectiveCamera(80, window.innerWidth / window.innerHeight, 1, 100000);
camera.up.set(0, 0, 1);
camera.lookAt(new THREE.Vector3(-1, 1, 0));
scene = new THREE.Scene();
//
scene.add( new THREE.HemisphereLight( 0x443333, 0x222233 ) );
var light = new THREE.DirectionalLight( 0xffffff, 1 );
light.position.set( 1, 1, 1 );
scene.add( light );
//------添加内容//---地板，平面
geometry = new THREE.PlaneGeometry(512, 200000);
//geometry.rotateX(-Math.PI / 2);var texture = new THREE.TextureLoader().load(‘img/dd.jpg‘);
texture.wrapS = THREE.RepeatWrapping;
texture.wrapT = THREE.RepeatWrapping;
texture.repeat.set(8, 800)
material = new THREE.MeshBasicMaterial({ map: texture });
//material = new THREE.MeshBasicMaterial( { vertexColors: THREE.VertexColors } );
mesh = new THREE.Mesh(geometry, material);
mesh.position.set(0, 0, 0);
scene.add(mesh);
objects.push(mesh);
////箱子1//geometry = new THREE.BoxGeometry(2, 2, 2);//material = new THREE.MeshBasicMaterial({color:0x000000});//mesh = new THREE.Mesh(geometry, material);//mesh.position.set(0,0,0);//scene.add(mesh);////箱子2//geometry = new THREE.BoxGeometry(2, 2, 2);//material = new THREE.MeshBasicMaterial({ color: 0xff0000 });//mesh = new THREE.Mesh(geometry, material);//mesh.position.set(100, 0, 0);//scene.add(mesh);////箱子3//geometry = new THREE.BoxGeometry(2, 2, 2);//material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });//mesh = new THREE.Mesh(geometry, material);//mesh.position.set(0, 100, 0);//scene.add(mesh);////箱子4//geometry = new THREE.BoxGeometry(2, 2, 2);//material = new THREE.MeshBasicMaterial({ color: 0x0000ff });//mesh = new THREE.Mesh(geometry, material);//mesh.position.set(0, 0, 100);//scene.add(mesh);//天空盒var textureLoader = new THREE.TextureLoader();
var materials = [
new THREE.MeshBasicMaterial({ map: textureLoader.load(‘img/px.jpg‘) }), // rightnew THREE.MeshBasicMaterial({ map: textureLoader.load(‘img/nx.jpg‘) }), // leftnew THREE.MeshBasicMaterial({ map: textureLoader.load(‘img/py.jpg‘) }), // topnew THREE.MeshBasicMaterial({ map: textureLoader.load(‘img/ny.jpg‘) }), // bottomnew THREE.MeshBasicMaterial({ map: textureLoader.load(‘img/pz.jpg‘) }), // backnew THREE.MeshBasicMaterial({ map: textureLoader.load(‘img/nz.jpg‘) }) // front ];
mesh = new THREE.Mesh(new THREE.BoxGeometry(100000, 100000, 100000, 7, 7, 7), new THREE.MultiMaterial(materials));
mesh.scale.x = -1;
scene.add(mesh);
//连续障碍物for (var i = 0; i < 50;i++) {
var ht=Math.random() * 450;
geometry = new THREE.BoxGeometry(80, 20, ht);
material = new THREE.MeshBasicMaterial({ color: Math.random() * 0xffffff });
mesh = new THREE.Mesh(geometry, material);
mesh.position.x =0;
mesh.position.y = (i+1) * 500;
mesh.position.z = ht / 2;
scene.add(mesh);
objects.push(mesh);
geometry = new THREE.BoxGeometry(80, 20, 450-ht);
mesh = new THREE.Mesh(geometry, material);
mesh.position.x = 0;
mesh.position.y = (i + 1) * 500;
mesh.position.z = ht + 140 + (450 - ht) / 2;
scene.add(mesh);
objects.push(mesh);
}
//鸟var loader = new THREE.JSONLoader();
loader.load( "models/animated/flamingo.js", function( geometry ) {
geometry.computeVertexNormals();
geometry.computeMorphNormals();
var material = new THREE.MeshPhongMaterial( {
color: 0xffffff,
morphTargets: true,
morphNormals: true,
vertexColors: THREE.FaceColors,
shading: THREE.SmoothShading
} );
birdmesh = new THREE.Mesh( geometry, material );
birdmesh.position.x = 0;
birdmesh.position.y = 0;
birdmesh.position.z = 200;
birdmesh.scale.set(0.2, 0.2, 0.2);
birdmesh.rotateX(-Math.PI / 2);
birdmesh.rotateZ(Math.PI);
scene.add(birdmesh);
mixer = new THREE.AnimationMixer(birdmesh);
var clip = THREE.AnimationClip.CreateFromMorphTargetSequence(‘bd‘, geometry.morphTargets, 30);
mixer.clipAction(clip).setDuration(1).play();
window.addEventListener(‘mousedown‘, function (event) {
velocity.z = 500;
mixer.clipAction(clip).setDuration(0.1).play();
}, false);
window.addEventListener(‘mouseup‘, function (event) {
mixer.clipAction(clip).setDuration(1).play();
}, false);
} );
renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
container.appendChild( renderer.domElement );
//控制//var controls = new THREE.OrbitControls(camera, renderer.domElement);//controls.addEventListener(‘change‘, render);//controls.target.set(0, 0, 0);//controls.update();//
window.addEventListener(‘resize‘, function onWindowResize(event) {
renderer.setSize(window.innerWidth, window.innerHeight);
camera.aspect = 0.5 * window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
}, false);
}
//
function animate() {
requestAnimationFrame( animate );
render();
}
function render() {
var delta = clock.getDelta();
//这里100就是速度的一个因子，数值越大，重力效果越明显,等效于velocity.y =(velocity.y*0.01- 9.8 * delta)*100;
velocity.z -= 9.8 * 100 * delta;
birdmesh.position.z += velocity.z*delta;
birdmesh.position.y += velocity.y * delta;
velocity.y = 200;
var raycaster1 = new THREE.Raycaster(birdmesh.position, new THREE.Vector3(0, 1, 0), 0, 30)
var raycaster2 = new THREE.Raycaster(birdmesh.position, new THREE.Vector3(0, 0, 1), 0, 10)
var raycaster3 = new THREE.Raycaster(birdmesh.position, new THREE.Vector3(0, 0, -1), 0, 10)
//
var intersections1 = raycaster1.intersectObjects(objects);
var intersections2 = raycaster2.intersectObjects(objects);
var intersections3 = raycaster3.intersectObjects(objects);
//是否检测到 if (intersections1.length > 0)
{
velocity.y = 0;
}
if (intersections2.length > 0 )
{
if (velocity.z > 0)
{
velocity.z = 0;
}
}
if (intersections3.length > 0) {
if (velocity.z < 0)
{
velocity.z = 0;
}
}
if (birdmesh.position.z < 10)
{
birdmesh.position.z = 10;
}
if (birdmesh.position.z > 575) {
birdmesh.position.z = 575;
}
if (velocity.y==0)
{
alert(‘您已死亡！‘);
}
mixer.update(delta);
camera.position.set(birdmesh.position.x+100, birdmesh.position.y - 50, birdmesh.position.z);
renderer.clear();
renderer.render( scene, camera );
}
</script>
</body>
</html>
原文：http://www.cnblogs.com/NuclearBoy/p/5675141.html
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