https://syoyo.github.io/tinyobjloader/
Tiny but powerful 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.
tinyobjloader is good for embedding .obj loader to your (global illumination) renderer ;-)
master branch will be replaced with develop branch in the near future: https://github.com/syoyo/tinyobjloader/tree/develop
develop branch has more better support and clean API interface for loading .obj and also it has optimized multi-threaded parser(probably 10x faster than master). If you are new to use TinyObjLoader, I highly recommend to use develop branch.
- Mar 13, 2016 : Introduce
load_flag_tand flat normal calculation flag! Thanks Vazquinhos! - Jan 29, 2016 : Support n-polygon(no triangulation) and OpenSubdiv crease tag! Thanks dboogert!
- Nov 26, 2015 : Now single-header only!.
- Nov 08, 2015 : Improved API.
- Jun 23, 2015 : Various fixes and added more projects using tinyobjloader. Thanks many contributors!
- Mar 03, 2015 : Replace atof() with hand-written parser for robust reading of numeric value. Thanks skurmedel!
- Feb 06, 2015 : Fix parsing multi-material object
- Sep 14, 2014 : Add support for multi-material per object/group. Thanks Mykhailo!
- Mar 17, 2014 : Fixed trim newline bugs. Thanks ardneran!
- Apr 29, 2014 : Add API to read .obj from std::istream. Good for reading compressed .obj or connecting to procedural primitive generator. Thanks burnse!
- Apr 21, 2014 : Define default material if no material definition exists in .obj. Thanks YarmUI!
- Apr 10, 2014 : Add support for parsing 'illum' and 'd'/'Tr' statements. Thanks mmp!
- Jan 27, 2014 : Added CMake project. Thanks bradc6!
- Nov 26, 2013 : Performance optimization by NeuralSandwich. 9% improvement in his project, thanks!
- Sep 12, 2013 : Added multiple .obj sticher example.
tinyobjloader can successfully load 6M triangles Rungholt scene. https://graphics.cs.williams.edu/data/meshes.xml
TinyObjLoader is successfully used in ...
- bullet3 https://github.com/erwincoumans/bullet3
- pbrt-v2 https://github.com/mmp/pbrt-v2
- OpenGL game engine development https://swarminglogic.com/jotting/2013_10_gamedev01
- mallie https://lighttransport.github.io/mallie
- IBLBaker (Image Based Lighting Baker). https://www.derkreature.com/iblbaker/
- Stanford CS148 https://web.stanford.edu/class/cs148/assignments/assignment3.pdf
- Awesome Bump https://awesomebump.besaba.com/about/
- sdlgl3-wavefront OpenGL .obj viewer https://github.com/chrisliebert/sdlgl3-wavefront
- pbrt-v3 https://github.com/mmp/pbrt-v3
- cocos2d-x https://github.com/cocos2d/cocos2d-x/
- Android Vulkan demo https://github.com/SaschaWillems/Vulkan
- voxelizer https://github.com/karimnaaji/voxelizer
- Probulator https://github.com/kayru/Probulator
- OptiX Prime baking https://github.com/nvpro-samples/optix_prime_baking
- FireRays SDK https://github.com/GPUOpen-LibrariesAndSDKs/FireRays_SDK
- parg, tiny C library of various graphics utilities and GL demos https://github.com/prideout/parg
- Opengl unit of ChronoEngine https://github.com/projectchrono/chrono-opengl
- Your project here!
- Group(parse multiple group name)
- Vertex
- Texcoord
- Normal
- Material
- Unknown material attributes are returned as key-value(value is string) map.
- Crease tag('t'). This is OpenSubdiv specific(not in wavefront .obj specification)
- Support different indices for vertex/normal/texcoord
Licensed under 2 clause BSD.
TinyObjLoader triangulate input .obj by default.
#define TINYOBJLOADER_IMPLEMENTATION // define this in only *one* .cc
#include "tiny_obj_loader.h"
std::string inputfile = "cornell_box.obj";
std::vector<tinyobj::shape_t> shapes;
std::vector<tinyobj::material_t> materials;
std::string err;
bool ret = tinyobj::LoadObj(shapes, materials, err, inputfile.c_str());
if (!err.empty()) { // `err` may contain warning message.
std::cerr << err << std::endl;
}
if (!ret) {
exit(1);
}
std::cout << "# of shapes : " << shapes.size() << std::endl;
std::cout << "# of materials : " << materials.size() << std::endl;
for (size_t i = 0; i < shapes.size(); i++) {
printf("shape[%ld].name = %s\n", i, shapes[i].name.c_str());
printf("Size of shape[%ld].indices: %ld\n", i, shapes[i].mesh.indices.size());
printf("Size of shape[%ld].material_ids: %ld\n", i, shapes[i].mesh.material_ids.size());
assert((shapes[i].mesh.indices.size() % 3) == 0);
for (size_t f = 0; f < shapes[i].mesh.indices.size() / 3; f++) {
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]);
}
printf("shape[%ld].vertices: %ld\n", i, shapes[i].mesh.positions.size());
assert((shapes[i].mesh.positions.size() % 3) == 0);
for (size_t v = 0; v < shapes[i].mesh.positions.size() / 3; v++) {
printf(" v[%ld] = (%f, %f, %f)\n", v,
shapes[i].mesh.positions[3*v+0],
shapes[i].mesh.positions[3*v+1],
shapes[i].mesh.positions[3*v+2]);
}
}
for (size_t i = 0; i < materials.size(); i++) {
printf("material[%ld].name = %s\n", i, materials[i].name.c_str());
printf(" material.Ka = (%f, %f ,%f)\n", materials[i].ambient[0], materials[i].ambient[1], materials[i].ambient[2]);
printf(" material.Kd = (%f, %f ,%f)\n", materials[i].diffuse[0], materials[i].diffuse[1], materials[i].diffuse[2]);
printf(" material.Ks = (%f, %f ,%f)\n", materials[i].specular[0], materials[i].specular[1], materials[i].specular[2]);
printf(" material.Tr = (%f, %f ,%f)\n", materials[i].transmittance[0], materials[i].transmittance[1], materials[i].transmittance[2]);
printf(" material.Ke = (%f, %f ,%f)\n", materials[i].emission[0], materials[i].emission[1], materials[i].emission[2]);
printf(" material.Ns = %f\n", materials[i].shininess);
printf(" material.Ni = %f\n", materials[i].ior);
printf(" material.dissolve = %f\n", materials[i].dissolve);
printf(" material.illum = %d\n", materials[i].illum);
printf(" material.map_Ka = %s\n", materials[i].ambient_texname.c_str());
printf(" material.map_Kd = %s\n", materials[i].diffuse_texname.c_str());
printf(" material.map_Ks = %s\n", materials[i].specular_texname.c_str());
printf(" material.map_Ns = %s\n", materials[i].specular_highlight_texname.c_str());
std::map<std::string, std::string>::const_iterator it(materials[i].unknown_parameter.begin());
std::map<std::string, std::string>::const_iterator itEnd(materials[i].unknown_parameter.end());
for (; it != itEnd; it++) {
printf(" material.%s = %s\n", it->first.c_str(), it->second.c_str());
}
printf("\n");
}Reading .obj without triangulation. Use num_vertices[i] to iterate over faces(indices). num_vertices[i] stores the number of vertices for ith face.
#define TINYOBJLOADER_IMPLEMENTATION // define this in only *one* .cc
#include "tiny_obj_loader.h"
std::string inputfile = "cornell_box.obj";
std::vector<tinyobj::shape_t> shapes;
std::vector<tinyobj::material_t> materials;
std::string err;
int flags = 1; // see load_flags_t enum for more information.
bool ret = tinyobj::LoadObj(shapes, materials, err, inputfile.c_str(), flags);
if (!err.empty()) { // `err` may contain warning message.
std::cerr << err << std::endl;
}
if (!ret) {
exit(1);
}
for (size_t i = 0; i < shapes.size(); i++) {
size_t indexOffset = 0;
for (size_t n = 0; n < shapes[i].mesh.num_vertices.size(); n++) {
int ngon = shapes[i].mesh.num_vertices[n];
for (size_t f = 0; f < ngon; f++) {
unsigned int v = shapes[i].mesh.indices[indexOffset + f];
printf(" face[%ld] v[%ld] = (%f, %f, %f)\n", n,
shapes[i].mesh.positions[3*v+0],
shapes[i].mesh.positions[3*v+1],
shapes[i].mesh.positions[3*v+2]);
}
indexOffset += ngon;
}
}
