155 lines
6.8 KiB
HTML
155 lines
6.8 KiB
HTML
<!doctype html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="chrome=1">
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<title>Tiny obj loader by syoyo</title>
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<link rel="stylesheet" href="stylesheets/styles.css">
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<link rel="stylesheet" href="stylesheets/pygment_trac.css">
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
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<script src="javascripts/respond.js"></script>
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<!--[if lt IE 9]>
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<![endif]-->
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<link rel="stylesheet" href="stylesheets/ie.css">
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<![endif]-->
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<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
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</head>
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<body>
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<div id="header">
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<nav>
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<li class="fork"><a href="https://github.com/syoyo/tinyobjloader">View On GitHub</a></li>
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<li class="downloads"><a href="https://github.com/syoyo/tinyobjloader/zipball/master">ZIP</a></li>
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<li class="downloads"><a href="https://github.com/syoyo/tinyobjloader/tarball/master">TAR</a></li>
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<li class="title">DOWNLOADS</li>
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</nav>
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</div><!-- end header -->
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<div class="wrapper">
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<section>
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<div id="title">
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<h1>Tiny obj loader</h1>
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<p>Tiny but powerful single file wavefront obj loader</p>
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<hr>
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<span class="credits left">Project maintained by <a href="https://github.com/syoyo">syoyo</a></span>
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<span class="credits right">Hosted on GitHub Pages — Theme by <a href="http://twitter.com/#!/michigangraham">mattgraham</a></span>
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</div>
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<p>Tiny but poweful single file wavefront obj loader written in C++. No dependencies except for C++ STL. It can parse over 10M polygons with moderate memory and time.</p>
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<p>A great .obj loader for embedding into your (global illumination) renderer ;-)</p>
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<p><a href="http://syoyo.github.io/tinyobjloader/">http://syoyo.github.io/tinyobjloader/</a></p>
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<h2>Features</h2>
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<ul>
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<li>Groups</li>
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<li>Indices</li>
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<li>Vertices</li>
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<li>Texcoords</li>
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<li>Normals</li>
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<li>Materials
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<ul>
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<li>Per-face materials.</li>
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<li>Unknown material attributes are treated as key-value.</li>
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</ul>
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</li>
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</ul>
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<h2>Example</h2>
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<p>tinyobjloader can successfully load the Rungholt scene with 6M triangles.<br>
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Source: <a href="http://graphics.cs.williams.edu/data/meshes.xml">http://graphics.cs.williams.edu/data/meshes.xml</a></p>
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<p><img src="https://github.com/syoyo/tinyobjloader/blob/master/images/rungholt.jpg?raw=true" alt="Rungholt"></p>
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<h2>Usage</h2>
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<p>First, load your mesh from file, storing the shapes and materials separately.</p>
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<pre><code>std::string inputfile = "cornell_box.obj";
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std::vector<tinyobj::shape_t> shapes;
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std::vector<tinyobj::material_t> materials;
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std::string err;
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if(!tinyobj::LoadObj(shapes, materials, err, inputfile.c_str()))
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std::cerr << err << std::endl;
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}
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std::cout << "# of shapes : " << shapes.size() << std::endl;
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std::cout << "# of materials : " << materials.size() << std::endl;
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</code></pre>
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<p>Now that you have loaded the shape and material data from file, you can iterate through each vector to get the information that you need.</p>
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<p>Each shape will contain vertex indices, positions, normals, UV coordinates and per-face material IDs.</p>
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<pre><code>for (size_t i = 0; i < shapes.size(); i++) {
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printf("shape[%ld].name = %s\n", i, shapes[i].name.c_str());
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printf("Size of shape[%ld].indices: %ld\n", i, shapes[i].mesh.indices.size());
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printf("Size of shape[%ld].material_ids: %ld\n", i, shapes[i].mesh.material_ids.size());
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assert((shapes[i].mesh.indices.size() % 3) == 0);
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for (size_t f = 0; f < shapes[i].mesh.indices.size() / 3; f++) {
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printf(" idx[%ld] = %d, %d, %d. mat_id = %d\n", f, shapes[i].mesh.indices[3*f+0], shapes[i].mesh.indices[3*f+1], shapes[i].mesh.indices[3*f+2], shapes[i].mesh.material_ids[f]);
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}
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printf("shape[%ld].vertices: %ld\n", i, shapes[i].mesh.positions.size());
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assert((shapes[i].mesh.positions.size() % 3) == 0);
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for (size_t v = 0; v < shapes[i].mesh.positions.size() / 3; v++) {
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printf(" v[%ld] = (%f, %f, %f)\n", v,
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shapes[i].mesh.positions[3*v+0],
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shapes[i].mesh.positions[3*v+1],
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shapes[i].mesh.positions[3*v+2]);
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}
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}</pre></code>
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<p>The per-face material IDs can be used to reference the materials in the materials vector.</p>
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<pre><code>for (size_t i = 0; i < materials.size(); i++) {
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printf("material[%ld].name = %s\n", i, materials[i].name.c_str());
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printf(" material.Ka = (%f, %f ,%f)\n", materials[i].ambient[0], materials[i].ambient[1], materials[i].ambient[2]);
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printf(" material.Kd = (%f, %f ,%f)\n", materials[i].diffuse[0], materials[i].diffuse[1], materials[i].diffuse[2]);
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printf(" material.Ks = (%f, %f ,%f)\n", materials[i].specular[0], materials[i].specular[1], materials[i].specular[2]);
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printf(" material.Tr = (%f, %f ,%f)\n", materials[i].transmittance[0], materials[i].transmittance[1], materials[i].transmittance[2]);
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printf(" material.Ke = (%f, %f ,%f)\n", materials[i].emission[0], materials[i].emission[1], materials[i].emission[2]);
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printf(" material.Ns = %f\n", materials[i].shininess);
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printf(" material.Ni = %f\n", materials[i].ior);
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printf(" material.dissolve = %f\n", materials[i].dissolve);
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printf(" material.illum = %d\n", materials[i].illum);
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printf(" material.map_Ka = %s\n", materials[i].ambient_texname.c_str());
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printf(" material.map_Kd = %s\n", materials[i].diffuse_texname.c_str());
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printf(" material.map_Ks = %s\n", materials[i].specular_texname.c_str());
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printf(" material.map_Ns = %s\n", materials[i].normal_texname.c_str());
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std::map<std::string, std::string>::const_iterator it(materials[i].unknown_parameter.begin());
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std::map<std::string, std::string>::const_iterator itEnd(materials[i].unknown_parameter.end());
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for (; it != itEnd; it++) {
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printf(" material.%s = %s\n", it->first.c_str(), it->second.c_str());
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}
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printf("\n");
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}</code></pre>
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<h2>Notes</h2>
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<ul>
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<li>Polygons are converted into triangles.</li>
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<li>You must specify the directory location of your material file as the 4th parameter of LoadObj() if your materials are not in the working directory of the application.</li>
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<ul>
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<li>Example:<code>LoadObj(shapes, materials, inputfile.c_str(), "/materials") </code></li>
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</ul>
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</ul>
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<footer>
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<p>Licensed under 2 clause BSD.</p>
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</footer>
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</section>
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</div>
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<!--[if !IE]><script>fixScale(document);</script><![endif]-->
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