{"id":2483,"date":"2018-02-11T10:25:34","date_gmt":"2018-02-11T02:25:34","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=2483"},"modified":"2018-02-11T10:25:34","modified_gmt":"2018-02-11T02:25:34","slug":"webgl-vs-three-js","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=2483","title":{"rendered":"WebGL vs Three.js"},"content":{"rendered":"

\n\t\u6700\u8fd1\u6709\u4eba\u95ee\u5230\u6211\u5982\u4f55\u7cfb\u7edf\u7684\u5b66\u4e60 Three.js<\/a>\uff0c\u6211\u7ed9\u4ed6\u63a8\u8350\u4e86\u77e5\u4e4e\u4e0a\u7684\u4e00\u7bc7\u6587\u7ae0\u300a\u5982\u4f55\u7cfb\u7edf\u7684\u5b66\u4e60three.js\uff1f<\/a>\u300b\u3002\u4ece\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\uff0c\u5b66\u4e60 Three.js<\/a>\uff0c\u6700\u597d\u8981\u6709\u4e00\u4e9b WebGL<\/a> \u57fa\u7840\u3002\u57fa\u4e8e\u6b64\uff0c\u672c\u6587\u5e0c\u671b\u901a\u8fc7\u4e00\u4e2a\u6700\u7b80\u5355\u7684\u4f8b\u5b50\u6765\u8bf4\u660e\u4ed6\u4eec\u4e4b\u95f4\u7684\u5173\u7cfb\u3002\n<\/p>\n

\n\t\u5173\u4e8e\u8fd8\u4e0d\u77e5\u9053 WebGL<\/a> \u548c Three.js<\/a> \u7684\uff0c\u5efa\u8bae\u5927\u5bb6\u5148\u9605\u8bfb\u4e00\u4e0b\u6211\u7684\u8fd9\u7bc7\u6587\u7ae0\u300aThree.js \u7b80\u4ecb<\/a>\u300b\u3002\n<\/p>\n

\n\tWebGL<\/a> \u662f\u4e00\u4e2a\u5e95\u5c42\u7684\u6807\u51c6\uff0c\u5728\u8fd9\u4e9b\u6807\u51c6\u88ab\u5b9a\u4e49\u4e4b\u540e\uff0cChrome\u3001Firefox\u4e4b\u7c7b\u7684\u6d4f\u89c8\u5668\u5b9e\u73b0\u4e86\u8fd9\u4e9b\u6807\u51c6\u3002\u7136\u540e\uff0c\u7a0b\u5e8f\u5458\u5c31\u80fd\u901a\u8fc7 JavaScript<\/a> \u4ee3\u7801\uff0c\u5728\u7f51\u9875\u4e0a\u5b9e\u73b0\u4e09\u7ef4\u56fe\u5f62\u7684\u6e32\u67d3\u4e86\u3002\u4f46\u662f\u76f4\u63a5\u4f7f\u7528 WebGL<\/a> \u592a\u8fc7\u590d\u6742\uff0c\u540c\u6837\u7684\u529f\u80fd\u9700\u8981\u66f4\u591a\u7684\u4ee3\u7801\uff0c\u4e8e\u662f Three.js<\/a> \u5e94\u7528\u800c\u751f\uff0c\u5b83\u76f8\u5f53\u4e8e\u4e00\u4e2a\u5b9e\u73b0\u6846\u67b6\u3002\u53ea\u9700\u66f4\u5c11\u7684\u4ee3\u7801\u5373\u53ef\u5b9e\u73b0\u66f4\u5f3a\u5927\u7684\u529f\u80fd\u3002\n<\/p>\n

\n\t\u4e3a\u4e86\u6bd4\u8f83\u8bf4\u660e Three.js<\/a> \u80fd\u5927\u5927\u7b80\u5316 WebGL<\/a> \u7684\u5f00\u53d1\uff0c\u6211\u4eec\u4f7f\u7528\u6700\u7b80\u5355\u7684\u4f8b\u5b50\u8fdb\u884c\u6bd4\u8f83\uff1a\u6e32\u67d3\u9ed1\u8272\u80cc\u666f\u4e0b\u7684\u767d\u8272\u6b63\u65b9\u5f62\u548c\u4e09\u89d2\u5f62\u3002\u6548\u679c\u5982\u56fe\u5982\u4e0b\uff1a\n<\/p>\n

\n\t\"WebGL\n<\/p>\n

\n\tThree.js<\/a> \u9700\u898130\u884c\u5de6\u53f3\u7684\u4ee3\u7801\u5373\u53ef\u5b9e\u73b0\uff1a\n<\/p>\n

\r\nvar renderer = new THREE.WebGLRenderer({\r\n    canvas: document.getElementById('mainCanvas')\r\n});\r\nrenderer.setClearColor(0x000000); \/\/ black\r\nvar scene = new THREE.Scene();\r\nvar camera = new THREE.PerspectiveCamera(45, 4 \/ 3, 1, 1000);\r\ncamera.position.set(0, 0, 5);\r\ncamera.lookAt(new THREE.Vector3(0, 0, 0));\r\nscene.add(camera);\r\nvar material = new THREE.MeshBasicMaterial({\r\n        color: 0xffffff \/\/ white\r\n});\r\n\/\/ plane \u4e1a\u4f59\u8349\uff1awww.xttblog.com\r\nvar planeGeo = new THREE.PlaneGeometry(1.5, 1.5);\r\nvar plane = new THREE.Mesh(planeGeo, material);\r\nplane.position.x = 1;\r\nscene.add(plane);\r\n\/\/ triangle\r\nvar triGeo = new THREE.Geometry();\r\ntriGeo.vertices = [new THREE.Vector3(0, -0.8, 0),\r\n        new THREE.Vector3(-2, -0.8, 0), new THREE.Vector3(-1, 0.8, 0)];\r\ntriGeo.faces.push(new THREE.Face3(0, 2, 1));\r\nvar triangle = new THREE.Mesh(triGeo, material);\r\nscene.add(triangle);\r\nrenderer.render(scene, camera);<\/pre>\n
\n\t\u6211\u4eec\u518d\u6765\u770b\u770b WebGL \u5b9e\u73b0\u8be5\u529f\u80fd\u7684\u4ee3\u7801\uff1a\n<\/p>\n
\r\nvar gl;\r\nfunction initGL(canvas) {\r\n    try {\r\n        gl = canvas.getContext("experimental-webgl");\r\n        gl.viewportWidth = canvas.width;\r\n        gl.viewportHeight = canvas.height;\r\n    } catch (e) {}\r\n    if (!gl) {\r\n        alert("Could not initialise WebGL, sorry :-(");\r\n    }\r\n}\r\nfunction getShader(gl, id) {\r\n    var shaderScript = document.getElementById(id);\r\n    if (!shaderScript) {\r\n        return null;\r\n    }\r\n    var str = "";\r\n    var k = shaderScript.firstChild;\r\n    while (k) {\r\n        if (k.nodeType == 3) {\r\n            str += k.textContent;\r\n        }\r\n        k = k.nextSibling;\r\n    }\r\n    var shader;\r\n    if (shaderScript.type == "x-shader\/x-fragment") {\r\n        shader = gl.createShader(gl.FRAGMENT_SHADER);\r\n    } else if (shaderScript.type == "x-shader\/x-vertex") {\r\n        shader = gl.createShader(gl.VERTEX_SHADER);\r\n    } else {\r\n        return null;\r\n    }\r\n    gl.shaderSource(shader, str);\r\n    gl.compileShader(shader);\r\n    if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {\r\n        alert(gl.getShaderInfoLog(shader));\r\n        return null;\r\n    }\r\n    return shader;\r\n}\r\nvar shaderProgram;\r\nfunction initShaders() {\r\n    var fragmentShader = getShader(gl, "shader-fs");\r\n    var vertexShader = getShader(gl, "shader-vs");\r\n    shaderProgram = gl.createProgram();\r\n    gl.attachShader(shaderProgram, vertexShader);\r\n    gl.attachShader(shaderProgram, fragmentShader);\r\n    gl.linkProgram(shaderProgram);\r\n    if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {\r\n        alert("Could not initialise shaders");\r\n    }\r\n    gl.useProgram(shaderProgram);\r\n    shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");\r\n    gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);\r\n    shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMatrix");\r\n    shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");\r\n}\r\nvar mvMatrix = mat4.create();\r\nvar pMatrix = mat4.create();\r\nfunction setMatrixUniforms() {\r\n    gl.uniformMatrix4fv(shaderProgram.pMatrixUniform, false, pMatrix);\r\n    gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mvMatrix);\r\n}\r\nvar triangleVertexPositionBuffer;\r\nvar squareVertexPositionBuffer;\r\nfunction initBuffers() {\r\n    triangleVertexPositionBuffer = gl.createBuffer();\r\n    gl.bindBuffer(gl.ARRAY_BUFFER, triangleVertexPositionBuffer);\r\n    var vertices = [\r\n         0.0,  1.0,  0.0,\r\n        -1.0, -1.0,  0.0,\r\n         1.0, -1.0,  0.0\r\n    ];\r\n    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);\r\n    triangleVertexPositionBuffer.itemSize = 3;\r\n    triangleVertexPositionBuffer.numItems = 3;\r\n    squareVertexPositionBuffer = gl.createBuffer();\r\n    gl.bindBuffer(gl.ARRAY_BUFFER, squareVertexPositionBuffer);\r\n    vertices = [\r\n         1.0,  1.0,  0.0,\r\n        -1.0,  1.0,  0.0,\r\n         1.0, -1.0,  0.0,\r\n        -1.0, -1.0,  0.0\r\n    ];\r\n    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);\r\n    squareVertexPositionBuffer.itemSize = 3;\r\n    squareVertexPositionBuffer.numItems = 4;\r\n}\r\nfunction drawScene() {\r\n    gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);\r\n    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);\r\n    mat4.perspective(45, gl.viewportWidth \/ gl.viewportHeight, 0.1, 100.0, pMatrix);\r\n    mat4.identity(mvMatrix);\r\n    mat4.translate(mvMatrix, [-1.5, 0.0, -7.0]);\r\n    gl.bindBuffer(gl.ARRAY_BUFFER, triangleVertexPositionBuffer);\r\n    gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, triangleVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);\r\n    setMatrixUniforms();\r\n    gl.drawArrays(gl.TRIANGLES, 0, triangleVertexPositionBuffer.numItems);\r\n\t\/\/ \u4e1a\u4f59\u8349\uff1awww.xttblog.com\r\n    mat4.translate(mvMatrix, [3.0, 0.0, 0.0]);\r\n    gl.bindBuffer(gl.ARRAY_BUFFER, squareVertexPositionBuffer);\r\n    gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, squareVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);\r\n    setMatrixUniforms();\r\n    gl.drawArrays(gl.TRIANGLE_STRIP, 0, squareVertexPositionBuffer.numItems);\r\n}\r\nfunction webGLStart() {\r\n    var canvas = document.getElementById("lesson01-canvas");\r\n    initGL(canvas);\r\n    initShaders();\r\n    initBuffers();\r\n\t\/\/ \u4e1a\u4f59\u8349\uff1awww.xttblog.com\r\n    gl.clearColor(0.0, 0.0, 0.0, 1.0);\r\n    gl.enable(gl.DEPTH_TEST);\r\n    drawScene();\r\n}<\/pre>\n
\n\t\u4ece\u4e0a\u9762\u7684\u4ee3\u7801\u6211\u4eec\u4e0d\u96be\u53d1\u73b0\uff0c\u4f7f\u7528\u539f\u751f WebGL<\/a> \u63a5\u53e3\u5b9e\u73b0\u540c\u6837\u529f\u80fd\u9700\u89815\u500d\u591a\u7684\u4ee3\u7801\u91cf\uff0c\u800c\u4e14\u5f88\u591a\u4ee3\u7801\u5bf9\u4e8e\u6ca1\u6709\u56fe\u5f62\u5b66\u57fa\u7840\u7684\u7a0b\u5e8f\u5458\u662f\u5f88\u96be\u770b\u61c2\u7684\u3002\u7531\u8fd9\u4e2a\u4f8b\u5b50\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\uff0c\u4f7f\u7528 Three.js<\/a> \u5f00\u53d1\u8981\u6bd4 WebGL<\/a> \u66f4\u5feb\u66f4\u9ad8\u6548\u3002\u5c24\u5176\u5bf9\u56fe\u5f62\u5b66\u77e5\u8bc6\u4e0d\u719f\u6089\u7684\u7a0b\u5e8f\u5458\u800c\u8a00\uff0c\u4f7f\u7528 Three.js<\/a> \u80fd\u591f\u964d\u4f4e\u5b66\u4e60\u6210\u672c\uff0c\u63d0\u9ad8\u4e09\u7ef4\u56fe\u5f62\u7a0b\u5e8f\u5f00\u53d1\u7684\u6548\u7387\u3002<\/p>\n
\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/<\/p>
\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1axttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p>
\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a\u4e1a\u4f59\u8349<\/a>\uff1a » WebGL vs Three.js<\/a><\/p>","protected":false},"excerpt":{"rendered":"
\u6700\u8fd1\u6709\u4eba\u95ee\u5230\u6211\u5982\u4f55\u7cfb\u7edf\u7684\u5b66\u4e60 Three.js\uff0c\u6211\u7ed9\u4ed6\u63a8\u8350\u4e86\u77e5\u4e4e\u4e0a\u7684\u4e00\u7bc7\u6587\u7ae0\u300a\u5982\u4f55\u7cfb\u7edf\u7684\u5b66\u4e60three.js\uff1f […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[31,814,1106,1475,1552],"class_list":["post-2483","post","type-post","status-publish","format-standard","hentry","category-html5","tag-canvas","tag-css3","tag-javascript","tag-three-js","tag-webgl"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/2483","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2483"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/2483\/revisions"}],"predecessor-version":[{"id":2484,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/2483\/revisions\/2484"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2483"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2483"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2483"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}