133 lines
5.5 KiB
Markdown
133 lines
5.5 KiB
Markdown
tinyobjloader
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=============
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[](https://app.wercker.com/project/bykey/495a3bac400212cdacdeb4dd9397bf4f)
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http://syoyo.github.io/tinyobjloader/
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Tiny but poweful single file wavefront obj loader written in C++. No dependency except for C++ STL. It can parse 10M over polygons with moderate memory and time.
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`tinyobjloader` is good for embedding .obj loader to your (global illumination) renderer ;-)
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What's new
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----------
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* Mar 03, 2015 : Replace atof() with hand-written parser for robust reading of numeric value. Thanks skurmedel!
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* Feb 06, 2015 : Fix parsing multi-material object
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* Sep 14, 2014 : Add support for multi-material per object/group. Thanks Mykhailo!
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* Mar 17, 2014 : Fixed trim newline bugs. Thanks ardneran!
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* Apr 29, 2014 : Add API to read .obj from std::istream. Good for reading compressed .obj or connecting to procedural primitive generator. Thanks burnse!
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* Apr 21, 2014 : Define default material if no material definition exists in .obj. Thanks YarmUI!
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* Apr 10, 2014 : Add support for parsing 'illum' and 'd'/'Tr' statements. Thanks mmp!
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* Jan 27, 2014 : Added CMake project. Thanks bradc6!
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* Nov 26, 2013 : Performance optimization by NeuralSandwich. 9% improvement in his project, thanks!
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* Sep 12, 2013 : Added multiple .obj sticher example.
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Example
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-------
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tinyobjloader can successfully load 6M triangles Rungholt scene.
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http://graphics.cs.williams.edu/data/meshes.xml
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Use case
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--------
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TinyObjLoader is successfully used in ...
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* bullet3 https://github.com/erwincoumans/bullet3
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* pbrt-v2 https://https://github.com/mmp/pbrt-v2
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* OpenGL game engine development http://swarminglogic.com/jotting/2013_10_gamedev01
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* mallie https://lighttransport.github.io/mallie
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* IBLBaker (Image Based Lighting Baker). http://www.derkreature.com/iblbaker/
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* Stanford CS148 http://web.stanford.edu/class/cs148/assignments/assignment3.pdf
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* Your project here!
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Features
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--------
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* Group(parse multiple group name)
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* Vertex
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* Texcoord
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* Normal
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* Material
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* Unknown material attributes are returned as key-value(value is string) map.
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Notes
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-----
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Polygon is converted into triangle.
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TODO
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----
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- [ ] Support quad polygon and some tags for OpenSubdiv http://graphics.pixar.com/opensubdiv/
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- [ ] Add rubust parser to replace `atof()` #28
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License
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-------
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Licensed under 2 clause BSD.
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Usage
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-----
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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 = tinyobj::LoadObj(shapes, materials, inputfile.c_str());
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if (!err.empty()) {
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std::cerr << err << std::endl;
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exit(1);
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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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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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}
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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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}
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