由于項目需要展示3d模型,所以對three做了點研究,分享出來 希望能幫到大家
先看看效果:
three.js整體來說 不是很難 只要你靜下心來研究研究 很快就會上手的
首先我們在頁面上需要創建一個能夠放置3D模型的畫布 也可以說是初始化 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); }通過上面的代碼不難看出 我們設置了 在body里追加了一塊畫布 寬高是 client的一半顏色為 0x66666 這里要注意的是 renderer = new THREE.WebGLRenderer(); 因為我們所有的設置都是以renderer為對象設置
下來 我們需要調整攝像頭 即視覺角度
/* 攝像頭 */ 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); //設置視野的中心坐標 camera.lookAt(scene.position); }以上代碼主要是控制視覺角度 數值可以在后期根據自己的需求去調整
加載場景:
/* 場景 */ var scene; function initScene() { scene = new THREE.Scene(); }加載燈光效果
/* 燈光 */ var light,light2,light3; function initLight() { //平行光 light = new THREE.DirectionalLight(0xFFFFFF); light.position.set(0, 99, 0).normalize(); scene.add(light); //環境光 light2 = new THREE.AmbientLight(0x999999); scene.add(light2); //點光源 light3 = new THREE.PointLight(0x00FF00); light3.position.set(300, 0, 0); scene.add(light3); }顯示模型對象:
/* 顯示對象 */ 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; //磚紅色 var material = new THREE.MeshPhongMaterial( { ambient: 0xff5533, color: 0xff5533, specular: 0x111111, shininess: 200 } ); //純黑色// var material = new THREE.MeshBasicMaterial( { envMap: THREE.ImageUtils.loadTexture( 'http://localhost:8080/textures/metal.jpg', new THREE.SphericalReflectionMapping() ), overdraw: true } ) ; //粉色 帶陰影// var material = new THREE.MeshLambertMaterial( { color:0xff5533, side: THREE.DoubleSide } ); //灰色// var material = new THREE.MeshLambertMaterial({color: 000000}); //材質設定 (顏色) 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); //利用一個軸對象以可視化的3軸以簡單的方式。X軸是紅色的。Y軸是綠色的。Z軸是藍色的。這有助于理解在空間的所有三個軸的方向。 var axisHelper = new THREE.AxisHelper(800); scene.add(axisHelper); //周圍邊框 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); //地板網格// 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/莫比烏斯環.STL' ); }這里根據文件類型選擇相對應的js引入即可 我加載的是STL模型 所以我引入的是 STLLoader.js
<script src="js/STLLoader.js"></script>
如果需要顯示網格標尺 將 網格部分代碼 去掉注釋即可
下來是控制方法 (雖然我沒有在顯示代碼里面寫根據鍵盤按鍵放大縮小 但還是提供給大家 參考)
//控制 var effect; var controls; function initControl(){ effect = new THREE.AsciiEffect( renderer ); effect.setSize( WIDTH, HEIGHT ); controls = new THREE.TrackballControls( camera,renderer.domElement); }最后就是一個初始調用了
function animate() { requestAnimationFrame( animate ); controls.update(); effect.render( scene, camera ); } function threeStart() { initThree(); initScene(); initCamera(); initLight(); initObject(); initControl(); animate(); }附上完整代碼
<!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); } /* 攝像頭 */ 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); //設置視野的中心坐標 camera.lookAt(scene.position); } /* 場景 */ var scene; function initScene() { scene = new THREE.Scene(); } /* 燈光 */ var light,light2,light3; function initLight() { //平行光 light = new THREE.DirectionalLight(0xFFFFFF); light.position.set(0, 99, 0).normalize(); scene.add(light); //環境光 light2 = new THREE.AmbientLight(0x999999); scene.add(light2); //點光源 light3 = new THREE.PointLight(0x00FF00); light3.position.set(300, 0, 0); scene.add(light3); } /* 顯示對象 */ 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; //磚紅色 var material = new THREE.MeshPhongMaterial( { ambient: 0xff5533, color: 0xff5533, specular: 0x111111, shininess: 200 } ); //純黑色// var material = new THREE.MeshBasicMaterial( { envMap: THREE.ImageUtils.loadTexture( 'http://localhost:8080/textures/metal.jpg', new THREE.SphericalReflectionMapping() ), overdraw: true } ) ; //粉色 帶陰影// var material = new THREE.MeshLambertMaterial( { color:0xff5533, side: THREE.DoubleSide } ); //灰色// var material = new THREE.MeshLambertMaterial({color: 000000}); //材質設定 (顏色) 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); //利用一個軸對象以可視化的3軸以簡單的方式。X軸是紅色的。Y軸是綠色的。Z軸是藍色的。這有助于理解在空間的所有三個軸的方向。 var axisHelper = new THREE.AxisHelper(800); scene.add(axisHelper); //周圍邊框 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); //地板網格// 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/莫比烏斯環.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 我的文件結構
如果想要所有文件的小伙伴 給我留言即可
補充一點,由于在顯示模型的方法里我加入了 bboxHelper = new THREE.BoxHelper() 所以我們可以獲取到模型的 X Y Z三軸的尺寸 也可以當作 模型的長寬高
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。
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