Obj模型导入器实现
来源：互联网 发布：ktv软件电脑版 编辑：程序博客网 时间：2024/05/22 01:54
本文已弃更
注意：材质文件的读取还没有搞定，有空的时候更新。
void function () { function loadFile(url, syne, type, callback) { /// <summary>Ajax加载文件</summary> /// <param name="url" type="String">文件地址</param> /// <param name="syne" type="Boolean">是否异步加载</param> /// <param name="type" type="String">Mime类型</param> /// <param name="callback" type="Function">回调函数</param> var xmlHttp = new XMLHttpRequest(); if (syne == null) { syne = true; } if (type == null) { type = 'text/plain'; } if (!("withCredentials" in xmlHttp)) { xmlHttp = new XDomainRequest(); xmlHttp.onload = function () { callback(this.responseText); }; xmlHttp.open("GET", url); } else { xmlHttp.open('GET', url, syne); //定义传输的文件HTTP头信息 xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"); } // 文本格式不支持设置responseType if (type.indexOf("text") < 0) { xmlHttp.responseType = type; } xmlHttp.onerror = function () { throw new Error("File \"" + url + "\" failed to load."); }; xmlHttp.onreadystatechange = function () { if (xmlHttp.readyState === 4) { if (xmlHttp.status == 404) { this.onerror(); } if (callback) { if (type.indexOf("text") < 0) { callback(xmlHttp.response); } else { callback(xmlHttp.responseText); } } this.onreadystatechange = null; this.onerror = null; xmlHttp = null; callback = null; } }; xmlHttp.send(null); }; function hasNaN(o) { /// <summary>判断指定参数的子项中是否存在NaN</summary> /// <param name="o" type="Object">要检查的对象</param> for (var k in o) { if (NaN == o[k]) return true; } return false; } window.objModelLoader = function (fileName, callback, gl) { /// <summary>加载Obj格式模型</summary> /// <param name="fileName" type="String">文件路径</param> /// <param name="callback" type="Function">回调函数</param> /// <param name="gl" type="WebGLContext">WebGL上下文</param> if (!gl) throw new Error("WebGL context not found."); var _this = this; // 使用Ajax加载Obj格式模型文件 loadFile(fileName, true, null, function (obj) { //obj = obj.toString().trim(); // 除去整篇文档的前后空格 //obj = obj.replace(/\r\n/g, "\n"); // 将整篇文档中的回车换行符替换成换行符 //obj = obj.replace(/\r/g, "\n"); // 将整篇文档中的回车符替换成换行符 //obj = obj.replace(/#+[^\n]*\n/g, "\n"); // 将整篇文档中的注释部分替换成换行符 //obj = obj.replace(/\\\n/g, ""); // 将整篇文档中每行最后的斜线和换行符与下一行连接 var objcmds = obj.split(/\s*\n+\s*/); obj = function () { var model = { geometricVertices: [], textureVertices: [], vertexNormals: [], parameterSpaceVertices: [], groups: [] }; var curgroup = null; for (var i = 0; i < objcmds.length; i++) { var cmdwords = objcmds[i].split(/\s+/); var o; switch (cmdwords[0]) { case "v": if (4 > cmdwords.length || hasNaN(o = { x: parseFloat(cmdwords[1]), y: parseFloat(cmdwords[2]), z: parseFloat(cmdwords[3]) })) continue; model.geometricVertices.push(o); break; case "vt": if (3 > cmdwords.length || hasNaN(o = { u: parseFloat(cmdwords[1]), v: parseFloat(cmdwords[2]) })) continue; model.textureVertices.push(o); break; case "vn": if (4 > cmdwords.length || hasNaN(o = { x: parseFloat(cmdwords[1]), y: parseFloat(cmdwords[2]), z: parseFloat(cmdwords[3]) })) continue; model.vertexNormals.push(o); break; case "vp": if (4 > cmdwords.length || hasNaN(o = { x: parseFloat(cmdwords[1]), y: parseFloat(cmdwords[2]), z: parseFloat(cmdwords[3]) })) continue; model.parameterSpaceVertices.push(o); break; case "p": if (2 > cmdwords.length) continue; o = []; for (var j = 1; j < 2; j++) { o.push(parseInt(cmdwords[j])); } if (hasNaN(o)) continue; if (curgroup) curgroup.points.push(o); break; case "l": if (3 > cmdwords.length) continue; o = []; for (var j = 1; j < 3; j++) { o.push(parseInt(cmdwords[j])); } if (hasNaN(o)) continue; if (curgroup) curgroup.lines.push(o); break; case "f": if (4 > cmdwords.length) continue; o = []; for (var j = 1; j < 4; j++) { var m = cmdwords[j].match(/^(\d+)\/(\d+)\/(\d+)$/); if (null != m) { o.push({ idxVertex: m[1], idxTexture: m[2], idxNormals: m[3] }); continue; } o.push(parseInt(cmdwords[j])); } if (hasNaN(o)) continue; if (curgroup) curgroup.faces.push(o); break; case "g": if (2 > cmdwords.length) continue; model.groups.push(curgroup = { name: cmdwords[1], points: [], lines: [], faces: [] }); break; } } return model; }(); obj = function (obj) { var model = { materials: [], indices: [], vertexPositions: [], vertexNormals: [], vertexTextureCoords: [] }; var c = 0; for (var i = 0; i < obj.groups.length; i++) { var mapping = []; for (var j = 0; j < obj.groups[i].faces.length; j++) { for (var k = 0; k < obj.groups[i].faces[j].length; k++) { var o = obj.groups[i].faces[j][k]; var b = isNaN(o); var v = b ? o.idxVertex : o; var t = b ? o.idxTexture : 0.0; var n = b ? o.idxNormals : 0.0; var s = v + "/" + t + "/" + n; if (undefined == mapping[s]) { mapping[s] = { index: c++, vertex: 0 <= v - 1 ? obj.geometricVertices[v - 1] : null, texture: b && 0 <= t - 1 ? obj.textureVertices[t - 1] : null, normals: b && 0 <= n - 1 ? obj.vertexNormals[n - 1] : null }; model.vertexPositions.push(mapping[s].vertex.x); model.vertexPositions.push(mapping[s].vertex.y); model.vertexPositions.push(mapping[s].vertex.z); model.vertexNormals.push(mapping[s].normals.x); model.vertexNormals.push(mapping[s].normals.y); model.vertexNormals.push(mapping[s].normals.z); model.vertexTextureCoords.push(mapping[s].texture.u); model.vertexTextureCoords.push(mapping[s].texture.v); } model.indices.push(mapping[s].index); } } model.materials.push({ numindices: obj.groups[i].faces.length * 3 }); } model.vertexPositions = new Float32Array(model.vertexPositions); model.vertexNormals = new Float32Array(model.vertexNormals); model.indices = new Uint16Array(model.indices); return model; }(obj); // 执行回调函数 callback && callback(obj); }); };}(); 0 0
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