three.js实现3D模型展示

由于项目需要展示3d模型,所以对three做了点研究,分享出来 希望能帮到大家

先看看效果:

three.js整体来说 不是很难 只要你静下心来研究研究 很快就会上手的

首先我们在页面上需要创建一个能够放置3D模型的画布 也可以说是初始化 Three

var WIDTH,HEIGHT;
    var    renderer;
    function initThree() {
        WIDTH = document.documentElement.clientWidth/2; <!--{foreach from=$recommended_goods item=rgoods}--> <!-- {/foreach} -->
        HEIGHT = document.documentElement.clientHeight/2;
        /* 渲染器 */
        renderer = new THREE.WebGLRenderer();
        renderer.setSize(WIDTH , HEIGHT);
        renderer.setClearColor(new THREE.Color(0x66666));
        renderer.gammaInput = true;
        renderer.gammaOutput = true;

        document.body.appendChild(renderer.domElement);
    }

通过上面的代码不难看出 我们设置了 在body里追加了一块画布 宽高是 client的一半颜色为 0x66666 这里要注意的是  renderer = new THREE.WebGLRenderer(); 因为我们所有的设置都是以renderer为对象设置

下来 我们需要调整摄像头 即视觉角度

/* 摄像头 */
    var camera;
    function initCamera() {
        var VIEW_ANGLE = 45,
                ASPECT = WIDTH / HEIGHT,
                NEAR = 0.1,
                FAR = 10000;
        camera = new THREE.PerspectiveCamera(VIEW_ANGLE, ASPECT, NEAR, FAR);
        camera.position.set(20, 0, 0);
        //设置视野的中心坐标
        camera.lookAt(scene.position);
    }

以上代码主要是控制视觉角度 数值可以在后期根据自己的需求去调整

加载场景:

    /* 场景 */
    var scene;
    function initScene() {
        scene = new THREE.Scene();
    }

加载灯光效果

/* 灯光 */
    var light,light2,light3;
    function initLight() {
        //平行光
        light = new THREE.DirectionalLight(0xFFFFFF);
        light.position.set(0, 99, 0).normalize();
        scene.add(light);
        //环境光
        light2 = new THREE.AmbientLight(0x999999);
        scene.add(light2);
        //点光源
        light3 = new THREE.PointLight(0x00FF00);
        light3.position.set(300, 0, 0);
        scene.add(light3);
    }

显示模型对象:

    /* 显示对象 */
    var cube;
    function initObject(){
        // ASCII file
        var loader = new THREE.STLLoader();

        loader.addEventListener( 'load', function ( event ) {
            var loading = document.getElementById("Loading");
            loading.parentNode.removeChild(loading);
            var geometry = event.content;
            //砖红色
            var material = new THREE.MeshPhongMaterial( { ambient: 0xff5533, color: 0xff5533, specular: 0x111111, shininess: 200 } );
            //纯黑色
//            var material = new THREE.MeshBasicMaterial( { envMap: THREE.ImageUtils.loadTexture( 'http://localhost:8080/textures/metal.jpg', new THREE.SphericalReflectionMapping() ), overdraw: true } ) ;
            //粉色 带阴影
//            var material = new THREE.MeshLambertMaterial( { color:0xff5533, side: THREE.DoubleSide } );
            //灰色
//            var material = new THREE.MeshLambertMaterial({color: 000000});    //材质设定  (颜色)


            var mesh = new THREE.Mesh( geometry, material );

            var center = THREE.GeometryUtils.center(geometry);
            var boundbox=geometry.boundingBox;
            var vector3 = boundbox.size(null);
            var vector3 = boundbox.size(null);
            console.log(vector3);
            var scale = vector3.length();
            camera.position.set(scale, 0, 0);
            camera.lookAt(scene.position);
            scene.add(camera);


            //利用一个轴对象以可视化的3轴以简单的方式。X轴是红色的。Y轴是绿色的。Z轴是蓝色的。这有助于理解在空间的所有三个轴的方向。
            var axisHelper = new THREE.AxisHelper(800);
            scene.add(axisHelper);

            //周围边框
            bboxHelper = new THREE.BoxHelper();
            bboxHelper.visible = true;
            var meshMaterial = material;
            mainModel = new THREE.Mesh(geometry, meshMaterial);
            bboxHelper.update(mainModel);
            bboxHelper.geometry.computeBoundingBox();
            scene.add(bboxHelper);

            //地板网格
//            var gridHelper = new THREE.GridHelper(500, 40); // 500 is grid size, 20 is grid step
//            gridHelper.position = new THREE.Vector3(0, 0, 0);
//            gridHelper.rotation = new THREE.Euler(0, 0, 0);
//            scene.add(gridHelper);
//            var gridHelper2 = gridHelper.clone();
//            gridHelper2.rotation = new THREE.Euler(Math.PI / 2, 0, 0);
//            scene.add(gridHelper2);
//            var gridHelper3 = gridHelper.clone();
//            gridHelper3.rotation = new THREE.Euler(Math.PI / 2, 0, Math.PI / 2);
//            scene.add(gridHelper3);
//
//            var grid = new THREE.GridHelper(300, 40, 25, [0, 0, 1], 0x000055, 0.2, true, "#FFFFFF", "left");
//            scene.add(grid);


            var x = (boundbox.max.x - boundbox.min.x).toFixed(2);
            var y = (boundbox.max.y - boundbox.min.y).toFixed(2);
            var z = (boundbox.max.z - boundbox.min.z).toFixed(2);

            console.log(x);
            console.log(y);
            console.log(z);
            console.log(boundbox);

            mesh.position.set(0,0,0);
//            mesh.position.x = scene.position.x;
//            mesh.position.y = scene.position.y ;
//            mesh.position.z = scene.position.z;
            scene.add(mesh);


            renderer.clear();
            renderer.render(scene, camera);
        } );
        loader.load( '3dfile/莫比乌斯环.STL' );
    }

这里根据文件类型选择相对应的js引入即可 我加载的是STL模型 所以我引入的是 STLLoader.js

<script src="js/STLLoader.js"></script>

如果需要显示网格标尺 将 网格部分代码 去掉注释即可

下来是控制方法 (虽然我没有在显示代码里面写根据键盘按键放大缩小 但还是提供给大家 参考) 

//控制
    var effect;
    var controls;
    function initControl(){
        effect = new THREE.AsciiEffect( renderer );
        effect.setSize( WIDTH, HEIGHT );
        controls = new THREE.TrackballControls( camera,renderer.domElement);
    }

最后就是一个初始调用了

　　function animate() {
        requestAnimationFrame( animate );
        controls.update();
        effect.render( scene, camera );
    }

    function threeStart() {
        initThree();
        initScene();
        initCamera();
        initLight();
        initObject();
        initControl();
        animate();
    }

 

附上完整代码

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <title>WebGL</title>
    <script type="text/javascript" charset="utf-8" src="js/three.js"></script>
    <script src="js/STLLoader.js"></script>
    <script src="js/TrackballControls.js"></script>
    <script src="js/AsciiEffect.js"></script>
    <style>body{overflow:hidden;background:#eee}</style>
</head>
<script>
    var WIDTH,HEIGHT;
    var    renderer;
    function initThree() {
        WIDTH = document.documentElement.clientWidth/2; <!--{foreach from=$recommended_goods item=rgoods}--> <!-- {/foreach} -->
        HEIGHT = document.documentElement.clientHeight/2;
        /* 渲染器 */
        renderer = new THREE.WebGLRenderer();
        renderer.setSize(WIDTH , HEIGHT);
        renderer.setClearColor(new THREE.Color(0x66666));
        renderer.gammaInput = true;
        renderer.gammaOutput = true;

        document.body.appendChild(renderer.domElement);
    }

    /* 摄像头 */
    var camera;
    function initCamera() {
        var VIEW_ANGLE = 45,
                ASPECT = WIDTH / HEIGHT,
                NEAR = 0.1,
                FAR = 10000;
        camera = new THREE.PerspectiveCamera(VIEW_ANGLE, ASPECT, NEAR, FAR);
        camera.position.set(20, 0, 0);
        //设置视野的中心坐标
        camera.lookAt(scene.position);
    }

    /* 场景 */
    var scene;
    function initScene() {
        scene = new THREE.Scene();
    }

    /* 灯光 */
    var light,light2,light3;
    function initLight() {
        //平行光
        light = new THREE.DirectionalLight(0xFFFFFF);
        light.position.set(0, 99, 0).normalize();
        scene.add(light);
        //环境光
        light2 = new THREE.AmbientLight(0x999999);
        scene.add(light2);
        //点光源
        light3 = new THREE.PointLight(0x00FF00);
        light3.position.set(300, 0, 0);
        scene.add(light3);
    }

    /* 显示对象 */
    var cube;
    function initObject(){
        // ASCII file
        var loader = new THREE.STLLoader();

        loader.addEventListener( 'load', function ( event ) {
            var loading = document.getElementById("Loading");
            loading.parentNode.removeChild(loading);
            var geometry = event.content;
            //砖红色
            var material = new THREE.MeshPhongMaterial( { ambient: 0xff5533, color: 0xff5533, specular: 0x111111, shininess: 200 } );
            //纯黑色
//            var material = new THREE.MeshBasicMaterial( { envMap: THREE.ImageUtils.loadTexture( 'http://localhost:8080/textures/metal.jpg', new THREE.SphericalReflectionMapping() ), overdraw: true } ) ;
            //粉色 带阴影
//            var material = new THREE.MeshLambertMaterial( { color:0xff5533, side: THREE.DoubleSide } );
            //灰色
//            var material = new THREE.MeshLambertMaterial({color: 000000});    //材质设定  (颜色)


            var mesh = new THREE.Mesh( geometry, material );

            var center = THREE.GeometryUtils.center(geometry);
            var boundbox=geometry.boundingBox;
            var vector3 = boundbox.size(null);
            var vector3 = boundbox.size(null);
            console.log(vector3);
            var scale = vector3.length();
            camera.position.set(scale, 0, 0);
            camera.lookAt(scene.position);
            scene.add(camera);


            //利用一个轴对象以可视化的3轴以简单的方式。X轴是红色的。Y轴是绿色的。Z轴是蓝色的。这有助于理解在空间的所有三个轴的方向。
            var axisHelper = new THREE.AxisHelper(800);
            scene.add(axisHelper);

            //周围边框
            bboxHelper = new THREE.BoxHelper();
            bboxHelper.visible = true;
            var meshMaterial = material;
            mainModel = new THREE.Mesh(geometry, meshMaterial);
            bboxHelper.update(mainModel);
            bboxHelper.geometry.computeBoundingBox();
            scene.add(bboxHelper);

            //地板网格
//            var gridHelper = new THREE.GridHelper(500, 40); // 500 is grid size, 20 is grid step
//            gridHelper.position = new THREE.Vector3(0, 0, 0);
//            gridHelper.rotation = new THREE.Euler(0, 0, 0);
//            scene.add(gridHelper);
//            var gridHelper2 = gridHelper.clone();
//            gridHelper2.rotation = new THREE.Euler(Math.PI / 2, 0, 0);
//            scene.add(gridHelper2);
//            var gridHelper3 = gridHelper.clone();
//            gridHelper3.rotation = new THREE.Euler(Math.PI / 2, 0, Math.PI / 2);
//            scene.add(gridHelper3);
//
//            var grid = new THREE.GridHelper(300, 40, 25, [0, 0, 1], 0x000055, 0.2, true, "#FFFFFF", "left");
//            scene.add(grid);


            var x = (boundbox.max.x - boundbox.min.x).toFixed(2);
            var y = (boundbox.max.y - boundbox.min.y).toFixed(2);
            var z = (boundbox.max.z - boundbox.min.z).toFixed(2);

            console.log(x);
            console.log(y);
            console.log(z);
            console.log(boundbox);

            mesh.position.set(0,0,0);
//            mesh.position.x = scene.position.x;
//            mesh.position.y = scene.position.y ;
//            mesh.position.z = scene.position.z;
            scene.add(mesh);


            renderer.clear();
            renderer.render(scene, camera);
        } );
        loader.load( '3dfile/莫比乌斯环.STL' );
    }

    //控制
    var effect;
    var controls;
    function initControl(){
        effect = new THREE.AsciiEffect( renderer );
        effect.setSize( WIDTH, HEIGHT );
        controls = new THREE.TrackballControls( camera,renderer.domElement);
    }

    function animate() {
        requestAnimationFrame( animate );
        controls.update();
        effect.render( scene, camera );
    }

    function threeStart() {
        initThree();
        initScene();
        initCamera();
        initLight();
        initObject();
        initControl();
        animate();
    }
</script>
<body onload="threeStart()">
<div id="Loading" style="color:#fff">Loading...</div>
</body>
</html>

哦 我的文件结构

如果想要所有文件的小伙伴 给我留言即可 

 

补充一点,由于在显示模型的方法里我加入了 bboxHelper = new THREE.BoxHelper() 所以我们可以获取到模型的 X Y Z三轴的尺寸 也可以当作 模型的长宽高