【three.js练习程序】创建简单物理地形

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8">

    <title>ceshi</title>

    <style>

        body

        {

            margin: 0;

            overflow: hidden;

        }

    </style>

    <script src="./build/three.js"></script>

    <script src="./examples/js/libs/ammo.js"></script>

    <script src="./examples/js/controls/OrbitControls.js"></script>

    <script src="./examples/js/ImprovedNoise.js"></script>

</head>

<body>

    <div id="ThreeJs">

    </div>

    <script>

        var camera, controls, scene, renderer;

        var clock = new THREE.Clock();

        // 物理引擎相关变量

        var gravityConstant = -9.8;

        var collisionConfiguration;

        var dispatcher;

        var broadphase;

        var solver;

        var physicsWorld;

        var rigidBodies = [];

        var margin = 0.05;

        var transformAux1 = new Ammo.btTransform();

        var time = 0;

        // 高度场相关

        var terrainWidthExtents = 50;

        var terrainDepthExtents = 50;

        var terrainWidth = 50;

        var terrainDepth = 50;

        var terrainHalfWidth = terrainWidth / 2;

        var terrainHalfDepth = terrainDepth / 2;

        var terrainMaxHeight = 50;

        var terrainMinHeight = -20;

        var heightData = null;

        var ammoHeightData = null;

        init();

        animate();

        function init() {

            heightData = generateHeight(terrainWidth, terrainDepth);

            initGraphics();

            initPhysics();

            createObjects();

        }

        function initGraphics() {

            // three.js基本场景配置

            camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 0.1, 2000);

            camera.position.x = 50;

            camera.position.y = 50;

            camera.position.z = 50;

            controls = new THREE.OrbitControls(camera);

            controls.target.y = 2;

            renderer = new THREE.WebGLRenderer();

            renderer.setClearColor(new THREE.Color("#bfd1e5"));

            renderer.shadowMapEnabled = true;

            renderer.setSize(window.innerWidth, window.innerHeight);

            // 场景

            scene = new THREE.Scene();

            // 环境光

            var ambientLight = new THREE.AmbientLight(0x404040);

            scene.add(ambientLight);

            // 线性光

            var light = new THREE.DirectionalLight(0xffffff, 1);

            light.position.set(-20, 20, 10);

            light.castShadow = true;

            var d = 50;

            light.shadow.camera.left = -d;

            light.shadow.camera.right = d;

            light.shadow.camera.top = d;

            light.shadow.camera.bottom = -d;

            light.shadow.camera.near = 2;

            light.shadow.camera.far = 50;

            light.shadow.mapSize.x = 1024;

            light.shadow.mapSize.y = 1024;

            scene.add(light);

            var axes = new THREE.AxisHelper(50);               //创建三轴表示

            scene.add(axes);

            // 添加窗口大小变化监听

            window.addEventListener('resize', onWindowResize, false);

        }

        function onWindowResize() {

            camera.aspect = window.innerWidth / window.innerHeight;

            camera.updateProjectionMatrix();

            renderer.setSize(window.innerWidth, window.innerHeight);

        }

        function initPhysics() {

            // bullet基本场景配置

            collisionConfiguration = new Ammo.btDefaultCollisionConfiguration();

            dispatcher = new Ammo.btCollisionDispatcher(collisionConfiguration);

            broadphase = new Ammo.btDbvtBroadphase();

            solver = new Ammo.btSequentialImpulseConstraintSolver();

            physicsWorld = new Ammo.btDiscreteDynamicsWorld(dispatcher, broadphase, solver, collisionConfiguration);

            physicsWorld.setGravity(new Ammo.btVector3(0, gravityConstant, 0));

        }

        function createObjects() {

            var pos = new THREE.Vector3();

            var quat = new THREE.Quaternion();

            //创建物理地形

            var geometry = new THREE.PlaneBufferGeometry(50, 50, terrainWidth - 1, terrainDepth - 1);

            geometry.rotateX(-Math.PI / 2);

            var vertices = geometry.attributes.position.array;

            for (var i = 0, j = 0, l = vertices.length; i < l; i++, j += 3) {

                // j + 1 because it is the y component that we modify

                vertices[j + 1] = heightData[i];

            }

            geometry.computeVertexNormals();

            var groundMaterial = new THREE.MeshPhongMaterial({ color: 0xC7C7C7 });

            terrainMesh = new THREE.Mesh(geometry, groundMaterial);

            terrainMesh.receiveShadow = true;

            terrainMesh.castShadow = true;

            scene.add(terrainMesh);

            var groundShape = createTerrainShape(heightData);

            var groundTransform = new Ammo.btTransform();

            groundTransform.setIdentity();

            // 设置bullet计算时物体中心

            groundTransform.setOrigin(new Ammo.btVector3(0, (terrainMaxHeight + terrainMinHeight) / 2, 0));

            var groundMass = 0;

            var groundLocalInertia = new Ammo.btVector3(0, 0, 0);

            var groundMotionState = new Ammo.btDefaultMotionState(groundTransform);

            var groundBody = new Ammo.btRigidBody(new Ammo.btRigidBodyConstructionInfo(groundMass, groundMotionState, groundShape, groundLocalInertia));

            physicsWorld.addRigidBody(groundBody);

            //创建50个小球

            for (var i = 0; i < 50; i++) {

                var ballMass = 1.2;

                var ballRadius = 0.5;

                var ball = new THREE.Mesh(new THREE.SphereGeometry(ballRadius, 20, 20), createRendomColorObjectMeatrial());

                ball.castShadow = true;

                ball.receiveShadow = true;

                var ballShape = new Ammo.btSphereShape(ballRadius);

                ballShape.setMargin(margin);

                pos.set(Math.random() + 10, 3 * (i + 1) + 20, Math.random() - 10);

                quat.set(0, 0, 0, 1);

                createRigidBody(ball, ballShape, ballMass, pos, quat);

                ball.userData.physicsBody.setFriction(1.5);

            }

            //创建50个方块

            for (var i = 0; i < 50; i++) {

                pos.set(Math.random() - 10, 3 * (i + 1) + 20, Math.random() + 10);

                quat.set(0, 0, 0, 1);

                createParallellepiped(1, 1, 1, 1, pos, quat, createRendomColorObjectMeatrial());

            }

        }

        function createRendomColorObjectMeatrial() {

            var color = Math.floor(Math.random() * (1 << 24));

            return new THREE.MeshPhongMaterial({ color: color });

        }

        function createParallellepiped(sx, sy, sz, mass, pos, quat, material) {

            var threeObject = new THREE.Mesh(new THREE.BoxGeometry(sx, sy, sz, 1, 1, 1), material);

            threeObject.castShadow = true;

            threeObject.receiveShadow = true;

            var shape = new Ammo.btBoxShape(new Ammo.btVector3(sx * 0.5, sy * 0.5, sz * 0.5));

            shape.setMargin(margin);

            createRigidBody(threeObject, shape, mass, pos, quat);

            return threeObject;

        }

        function createRigidBody(threeObject, physicsShape, mass, pos, quat) {

            threeObject.position.copy(pos);

            threeObject.quaternion.copy(quat);

            var transform = new Ammo.btTransform();

            transform.setIdentity();

            transform.setOrigin(new Ammo.btVector3(pos.x, pos.y, pos.z));

            transform.setRotation(new Ammo.btQuaternion(quat.x, quat.y, quat.z, quat.w));

            var motionState = new Ammo.btDefaultMotionState(transform);

            var localInertia = new Ammo.btVector3(0, 0, 0);

            physicsShape.calculateLocalInertia(mass, localInertia);

            var rbInfo = new Ammo.btRigidBodyConstructionInfo(mass, motionState, physicsShape, localInertia);

            var body = new Ammo.btRigidBody(rbInfo);

            threeObject.userData.physicsBody = body;

            scene.add(threeObject);

            if (mass > 0) {

                rigidBodies.push(threeObject);

                body.setActivationState(4);

            }

            physicsWorld.addRigidBody(body);

            return body;

        }

        function animate() {

            requestAnimationFrame(animate);

            var deltaTime = clock.getDelta();

            updatePhysics(deltaTime);

            controls.update(deltaTime);

            renderer.render(scene, camera);

            time += deltaTime;

        }

        function updatePhysics(deltaTime) {

            physicsWorld.stepSimulation(deltaTime);

            // 更新物体位置

            for (var i = 0, iL = rigidBodies.length; i < iL; i++) {

                var objThree = rigidBodies[i];

                var objPhys = objThree.userData.physicsBody;

                var ms = objPhys.getMotionState();

                if (ms) {

                    ms.getWorldTransform(transformAux1);

                    var p = transformAux1.getOrigin();

                    var q = transformAux1.getRotation();

                    objThree.position.set(p.x(), p.y(), p.z());

                    objThree.quaternion.set(q.x(), q.y(), q.z(), q.w());

                }

            }

        }

        function generateHeight(width, height) {

            var size = width * height, data = new Float32Array(size),

                perlin = new ImprovedNoise(), quality = 1, z = Math.random() * 10;

            for (var j = 0; j < 4; j++) {

                for (var i = 0; i < size; i++) {

                    var x = i % width, y = ~ ~(i / width);

                    data[i] += Math.abs(perlin.noise(x / quality, y / quality, z) * quality);

                }

                quality *= 3;

            }

            return data;

        }

        // 生成物理引擎用高度场

        function createTerrainShape(heightData) {

            // This parameter is not really used, since we are using PHY_FLOAT height data type and hence it is ignored

            var heightScale = 1;

            // Up axis = 0 for X, 1 for Y, 2 for Z. Normally 1 = Y is used.

            var upAxis = 1;

            // hdt, height data type. "PHY_FLOAT" is used. Possible values are "PHY_FLOAT", "PHY_UCHAR", "PHY_SHORT"

            var hdt = "PHY_FLOAT";

            // Set this to your needs (inverts the triangles)

            var flipQuadEdges = false;

            // Creates height data buffer in Ammo heap

            ammoHeightData = Ammo._malloc(4 * terrainWidth * terrainDepth);

            // Copy the javascript height data array to the Ammo one.

            var p = 0;

            var p2 = 0;

            for (var j = 0; j < terrainDepth; j++) {

                for (var i = 0; i < terrainWidth; i++) {

                    // write 32-bit float data to memory

                    Ammo.HEAPF32[ammoHeightData + p2 >> 2] = heightData[p];

                    p++;

                    // 4 bytes/float

                    p2 += 4;

                }

            }

            // Creates the heightfield physics shape

            var heightFieldShape = new Ammo.btHeightfieldTerrainShape(

                terrainWidth,

                terrainDepth,

                ammoHeightData,

                heightScale,

                terrainMinHeight,

                terrainMaxHeight,

                upAxis,

                hdt,

                flipQuadEdges

        );

            // Set horizontal scale

            var scaleX = terrainWidthExtents / (terrainWidth - 1);

            var scaleZ = terrainDepthExtents / (terrainDepth - 1);

            heightFieldShape.setLocalScaling(new Ammo.btVector3(scaleX, 1, scaleZ));

            heightFieldShape.setMargin(0.05);

            return heightFieldShape;

        }

        document.getElementById("ThreeJs").appendChild(renderer.domElement);

    </script>

</html>

【three.js练习程序】创建简单物理地形的更多相关文章

【three.js练习程序】创建简单物理场景
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title> ...
unity3d教程动态创建简单平面地形
unity3d创建地形是不须要usingUnityEditor的.这里使用了AssetDatabase.所以需using UnityEditor; 创建三步: 1.TerrainData terrai ...
基于Babylon.js编写宇宙飞船模拟程序1——程序基础结构、物理引擎使用、三维罗盘
计划做一个宇宙飞船模拟程序,首先做一些技术准备. 可以访问https://ljzc002.github.io/test/Spacetest/HTML/PAGE/spacetestwp2.html查看测 ...
node.js学习（三）简单的node程序&&模块简单使用&&commonJS规范&&深入理解模块原理
一.一个简单的node程序 1.新建一个txt文件 2.修改后缀修改之后会弹出这个,点击"是" 3.运行test.js 源文件使用node.js运行之后的. 如果该路径下没有该 ...
使用Visual Studio 2010 创建简单的Silverlight应用程序
使用Visual Studio 2010 创建简单的Silverlight应用程序 Silverlight是创建动态的引人的RIAs(Rich Internet Application)的新方法.这里 ...
在 Web 应用中创建 Node.js 应用程序
本分步指南将通过 Azure Web 应用帮助您启动并运行示例 Node.JS 应用程序.除 Node.JS 外,Azure Web 应用还支持其他语言,如 PHP..NET.Node.JS.Pyth ...
用chrome的snippets片段功能创建页面js外挂程序，从控制台创建js小脚本
用chrome的snippets片段功能创建页面js外挂程序,从控制台创建js小脚本 Chrome的snippets是小脚本,还可以创作并在Chrome DevTools的来源面板中执行.可以访问和从 ...
用简单的 Node.js 后台程序浅析 HTTP 请求与响应
用简单的 Node.js 后台程序浅析 HTTP 请求与响应本文写于 2020 年 1 月 18 日我们来看两种方式发送 HTTP 请求,一种呢,是命令行的 curl 命令:一种呢是直接在浏览器的 ...
Socket创建简单服务器和客户端程序
使用Socket编程创建简单服务器和客户端要知道的 Socket-AddressFamily, SocketType, ProtocolType https://blog.csdn.net/weix ...

随机推荐

Spring Security OAuth2实现单点登录
1.概述在本教程中,我们将讨论如何使用 Spring Security OAuth 和 Spring Boot 实现 SSO(单点登录). 本示例将使用到三个独立应用一个授权服务器(中央认证机制) ...
作用域中LHS查询和RHS查询
LHS查询:赋值操作左侧的查询,LHS查询试图找到变量的容器本身,,从而对其赋值. RHS查询:赋值操作右侧的查询,可以理解为"取到某某的值" 举例: function foo(a ...
【IT笔试面试题整理】链表
如何准备 Linked list questions are extremely common These can range from simple (delete a node ina linke ...
LVS专题-(3) 虚拟ip理解
1.虚拟IP是什么? 要是单讲解虚拟 IP,理解起来很困难,所以干脆把动态 IP .固定 IP .实体 IP 与虚拟 IP都讲解一下,加深理解和知识扩展实体 IP:在网络的世界里,为了要辨识每一部 ...
gradle 转 maven
1. 预备 1.1. java 环境验证 java -version 1.2. gradle 安装, 参考, 这里列举下windows下的安装 b.1 下载包:https://gradle.org/ ...
elasticSearch6源码分析(8)RepositoriesModule模块
1.RepositoriesModule概述 Sets up classes for Snapshot/Restore 1.1 snapshot概述 A snapshot is a backup ta ...
nodejs项目总结
前几天花了3天时间,搭建.开发了一个包含客户端.cms.server端的项目,也因着以前有php的开发经验,以及sql的设计和应用能力,倒也没遇到什么阻碍.至于项目结构搭建(架构),也是共通的,以模块 ...
map映照容器（常用的使用方法总结）
map映照容器的数据元素是由一个键值和一个映照数据组成的,键值和映照数据之间具有一一对应的关系.map与set集合容器一样,不允许插入的元素的键值重复. /*关于C++STL中map映照容器的学习,看 ...
Quartz2D截屏
#import "ViewController.h" @interface ViewController () @end @implementation ViewControlle ...
[转]Centos系统中查看文件和文件夹大小
本文转自:https://blog.csdn.net/zgmu/article/details/52882868 当磁盘大小超过标准时会有报警提示,这时如果掌握df和du命令是非常明智的选择.df可以 ...

【three.js练习程序】创建简单物理地形

【three.js练习程序】创建简单物理地形的更多相关文章

随机推荐

热门专题