tinyobjloader

http://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 ;-)

What's new

• XX YY, ZZZZ : New data strcutre and API!
• 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.

Example

tinyobjloader can successfully load 6M triangles Rungholt scene. http://graphics.cs.williams.edu/data/meshes.xml

Use case

TinyObjLoader is successfully used in ...

• bullet3 https://github.com/erwincoumans/bullet3
• pbrt-v2 https://github.com/mmp/pbrt-v2
• OpenGL game engine development http://swarminglogic.com/jotting/2013_10_gamedev01
• mallie https://lighttransport.github.io/mallie
• IBLBaker (Image Based Lighting Baker). http://www.derkreature.com/iblbaker/
• Stanford CS148 http://web.stanford.edu/class/cs148/assignments/assignment3.pdf
• Awesome Bump http://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
• Your project here!

Features

• 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)
• Callback API for custom loading.

TODO

• Read .obj/.mtl from memory

License

Licensed under 2 clause BSD.

Usage

#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);
}

// See loader_example.cc for more details.

Tests

Unit tests are provided in tests directory. See tests/README.md for details.