<!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

  1. 【three.js练习程序】创建简单物理场景

    <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title> ...

  2. 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 ...

  3. 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 ...

  4. 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 ...

  5. 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 ...

  6. 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 ...

  7. 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 ...

  8. 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 ...

  9. 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

  1. 关于Python数据分析与机器学习的一些资源

    https://github.com/search?l=Python&o=desc&q=python&s=stars&type=Repositories&utf ...

  2. keepalived双机热备，安装部署文档

    keepalived双击热备,安装部署文档: 下载目录:/apps/keepalived-1.2.7.tar.gz 1:---> yum install -y make wget 2:---&g ...

  3. 02-04:springboot 访问静态资源

    1.SpringBoot从classpath/static的目录下:(目录名称必须叫static,可以理解为根目录为static) 2.servletContext根目录下,进行查找: 在src/ma ...

  4. gulp 使用入门

    什么是gulp? 用自动化构建工具增强你的工作流程! Gulp 是基于node.js的一个前端自动化构建工具,开发者可以使用它构建自动化工作流程(前端集成开发环境). 使用gulp你可以简化工作量,让 ...

  5. Spring Boot + Spring Cloud 实现权限管理系统 后端篇（六）：集成 Swagger API

    spring-boot作为当前最为流行的Java web开发脚手架,越来越多的开发者选择用其来构建企业级的RESTFul API接口.这些接口不但会服务于传统的web端(b/s),也会服务于移动端.在 ...

  6. 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 ...

  7. （转）mybatis-plus入门

    目前正在维护的公司的一个项目是一个ssm架构的java项目,dao层的接口有大量数据库查询的方法,一个条件变化就要对应一个方法,再加上一些通用的curd方法,对应一张表的dao层方法有时候多达近20个 ...

  8. Deep learning with Python 学习笔记（6）

    本节介绍循环神经网络及其优化 循环神经网络(RNN,recurrent neural network)处理序列的方式是,遍历所有序列元素,并保存一个状态(state),其中包含与已查看内容相关的信息. ...

  9. python 使用 matplotlib.pyplot来画柱状图和饼图

    导入包 import matplotlib.pyplot as plt 柱状图 最简柱状图 # 显示高度 def autolabel(rects): for rect in rects: height ...

  10. RocketMQ专题2：三种常用生产消费方式(顺序、广播、定时)以及顺序消费源码探究

    顺序.广播.定时任务 前插 ​ 在进行常用的三种消息类型例子展示的时候,我们先来说一说RocketMQ的几个重要概念: PullConsumer与PushConsumer:主要区别在于Pull与Pus ...