Tiny but powerful Wavefront OBJ loader

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Project description

tinyobjloader

Tiny but powerful single file wavefront obj loader written in C++03. No dependency except for C++ STL. It can parse over 10M polygons with moderate memory and time.

tinyobjloader is good for embedding .obj loader to your (global illumination) renderer ;-)

If you are looking for C89 version, please see https://github.com/syoyo/tinyobjloader-c .

Version notice

We recommend to use master(main) branch. Its v2.0 release candidate. Most features are now nearly robust and stable(Remaining task for release v2.0 is polishing C++ and Python API, and fix built-in triangulation code).

We have released new version v1.0.0 on 20 Aug, 2016. Old version is available as v0.9.x branch https://github.com/syoyo/tinyobjloader/tree/v0.9.x

What's new

29 Jul, 2021 : Added Mapbox's earcut for robust triangulation. Also fixes triangulation bug(still there is some issue in built-in triangulation algorithm: https://github.com/tinyobjloader/tinyobjloader/issues/319).
19 Feb, 2020 : The repository has been moved to https://github.com/tinyobjloader/tinyobjloader !
18 May, 2019 : Python binding!(See python folder. Also see https://pypi-hypernode.com/project/tinyobjloader/)
14 Apr, 2019 : Bump version v2.0.0 rc0. New C++ API and python bindings!(1.x API still exists for backward compatibility)
20 Aug, 2016 : Bump version v1.0.0. New data structure and API!

Requirements

C++03 compiler

Old version

Previous old version is available in v0.9.x branch.

Example

Rungholt

tinyobjloader can successfully load 6M triangles Rungholt scene. http://casual-effects.com/data/index.html

examples/viewer/ OpenGL .obj viewer
examples/callback_api/ Callback API example
examples/voxelize/ Voxelizer example

Use case

TinyObjLoader is successfully used in ...

New version(v1.0.x)

Double precision support through TINYOBJLOADER_USE_DOUBLE thanks to noma
Loading models in Vulkan Tutorial https://vulkan-tutorial.com/Loading_models
.obj viewer with Metal https://github.com/middlefeng/NuoModelViewer/tree/master
Vulkan Cookbook https://github.com/PacktPublishing/Vulkan-Cookbook
cudabox: CUDA Solid Voxelizer Engine https://github.com/gaspardzoss/cudavox
Drake: A planning, control, and analysis toolbox for nonlinear dynamical systems https://github.com/RobotLocomotion/drake
VFPR - a Vulkan Forward Plus Renderer : https://github.com/WindyDarian/Vulkan-Forward-Plus-Renderer
glslViewer: https://github.com/patriciogonzalezvivo/glslViewer
Lighthouse2: https://github.com/jbikker/lighthouse2
rayrender(an open source R package for raytracing scenes in created in R): https://github.com/tylermorganwall/rayrender
liblava - A modern C++ and easy-to-use framework for the Vulkan API. [MIT]: https://github.com/liblava/liblava
rtxON - Simple Vulkan raytracing tutorials https://github.com/iOrange/rtxON
metal-ray-tracer - Writing ray-tracer using Metal Performance Shaders https://github.com/sergeyreznik/metal-ray-tracer https://sergeyreznik.github.io/metal-ray-tracer/index.html
Supernova Engine - 2D and 3D projects with Lua or C++ in data oriented design: https://github.com/supernovaengine/supernova
AGE (Arc Game Engine) - An open-source engine for building 2D & 3D real-time rendering and interactive contents: https://github.com/MohitSethi99/ArcGameEngine
Wicked Engine - 3D engine with modern graphics
Your project here! (Letting us know via github issue is welcome!)

Old version(v0.9.x)

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
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
Point Based Global Illumination on modern GPU https://pbgi.wordpress.com/code-source/
Fast OBJ file importing and parsing in CUDA http://researchonline.jcu.edu.au/42515/1/2015.CVM.OBJCUDA.pdf
Sorted Shading for Uni-Directional Pathtracing by Joshua Bainbridge https://nccastaff.bournemouth.ac.uk/jmacey/MastersProjects/MSc15/02Josh/joshua_bainbridge_thesis.pdf
GeeXLab http://www.geeks3d.com/hacklab/20160531/geexlab-0-12-0-0-released-for-windows/

Features

Group(parse multiple group name)
Vertex
- Vertex color(as an extension: https://blender.stackexchange.com/questions/31997/how-can-i-get-vertex-painted-obj-files-to-import-into-blender)
Texcoord
Normal
Crease tag('t'). This is OpenSubdiv specific(not in wavefront .obj specification)
Callback API for custom loading.
Double precision support(for HPC application).
Smoothing group
Python binding : See python folder.
- Precompiled binary(manylinux1-x86_64 only) is hosted at pypi https://pypi-hypernode.com/project/tinyobjloader/)

Primitives

face(f)
lines(l)
points(p)
curve
2D curve
surface.
Free form curve/surfaces

Material

PBR material extension for .MTL. Please see pbr-mtl.md for details.
Texture options
Unknown material attributes are returned as key-value(value is string) map.

TODO

Fix obj_sticker example.
More unit test codes.

License

TinyObjLoader is licensed under MIT license.

Third party licenses.

pybind11 : BSD-style license.
mapbox earcut.hpp: ISC License.

Usage

Installation

One option is to simply copy the header file into your project and to make sure that TINYOBJLOADER_IMPLEMENTATION is defined exactly once.

Building tinyobjloader - Using vcpkg(not recommended though)

Although it is not a recommended way, you can download and install tinyobjloader using the vcpkg dependency manager:

git clone https://github.com/Microsoft/vcpkg.git
cd vcpkg
./bootstrap-vcpkg.sh
./vcpkg integrate install
./vcpkg install tinyobjloader

The tinyobjloader port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please create an issue or pull request on the vcpkg repository.

Data format

attrib_t contains single and linear array of vertex data(position, normal and texcoord).

attrib_t::vertices => 3 floats per vertex

       v[0]        v[1]        v[2]        v[3]               v[n-1]
  +-----------+-----------+-----------+-----------+      +-----------+
  | x | y | z | x | y | z | x | y | z | x | y | z | .... | x | y | z |
  +-----------+-----------+-----------+-----------+      +-----------+

attrib_t::normals => 3 floats per vertex

       n[0]        n[1]        n[2]        n[3]               n[n-1]
  +-----------+-----------+-----------+-----------+      +-----------+
  | x | y | z | x | y | z | x | y | z | x | y | z | .... | x | y | z |
  +-----------+-----------+-----------+-----------+      +-----------+

attrib_t::texcoords => 2 floats per vertex

       t[0]        t[1]        t[2]        t[3]               t[n-1]
  +-----------+-----------+-----------+-----------+      +-----------+
  |  u  |  v  |  u  |  v  |  u  |  v  |  u  |  v  | .... |  u  |  v  |
  +-----------+-----------+-----------+-----------+      +-----------+

attrib_t::colors => 3 floats per vertex(vertex color. optional)

       c[0]        c[1]        c[2]        c[3]               c[n-1]
  +-----------+-----------+-----------+-----------+      +-----------+
  | x | y | z | x | y | z | x | y | z | x | y | z | .... | x | y | z |
  +-----------+-----------+-----------+-----------+      +-----------+

Each shape_t::mesh_t does not contain vertex data but contains array index to attrib_t. See loader_example.cc for more details.


mesh_t::indices => array of vertex indices.

  +----+----+----+----+----+----+----+----+----+----+     +--------+
  | i0 | i1 | i2 | i3 | i4 | i5 | i6 | i7 | i8 | i9 | ... | i(n-1) |
  +----+----+----+----+----+----+----+----+----+----+     +--------+

Each index has an array index to attrib_t::vertices, attrib_t::normals and attrib_t::texcoords.

mesh_t::num_face_vertices => array of the number of vertices per face(e.g. 3 = triangle, 4 = quad , 5 or more = N-gons).


  +---+---+---+        +---+
  | 3 | 4 | 3 | ...... | 3 |
  +---+---+---+        +---+
    |   |   |            |
    |   |   |            +-----------------------------------------+
    |   |   |                                                      |
    |   |   +------------------------------+                       |
    |   |                                  |                       |
    |   +------------------+               |                       |
    |                      |               |                       |
    |/                     |/              |/                      |/

 mesh_t::indices

  |    face[0]   |       face[1]     |    face[2]   |     |      face[n-1]           |
  +----+----+----+----+----+----+----+----+----+----+     +--------+--------+--------+
  | i0 | i1 | i2 | i3 | i4 | i5 | i6 | i7 | i8 | i9 | ... | i(n-3) | i(n-2) | i(n-1) |
  +----+----+----+----+----+----+----+----+----+----+     +--------+--------+--------+

Note that when triangulate flag is true in tinyobj::LoadObj() argument, num_face_vertices are all filled with 3(triangle).

float data type

TinyObjLoader now use real_t for floating point data type. Default is float(32bit). You can enable double(64bit) precision by using TINYOBJLOADER_USE_DOUBLE define.

Robust triangulation

When you enable triangulation(default is enabled), TinyObjLoader triangulate polygons(faces with 4 or more vertices).

Built-in trinagulation code may not work well in some polygon shape.

You can define TINYOBJLOADER_USE_MAPBOX_EARCUT for robust triangulation using mapbox/earcut.hpp. This requires C++11 compiler though. And you need to copy mapbox/earcut.hpp to your project. If you have your own mapbox/earcut.hpp file incuded in your project, you can define TINYOBJLOADER_DONOT_INCLUDE_MAPBOX_EARCUT so that mapbox/earcut.hpp is not included inside of tiny_obj_loader.h.

Example code (Deprecated API)

#define TINYOBJLOADER_IMPLEMENTATION // define this in only *one* .cc
// Optional. define TINYOBJLOADER_USE_MAPBOX_EARCUT gives robust trinagulation. Requires C++11
//#define TINYOBJLOADER_USE_MAPBOX_EARCUT
#include "tiny_obj_loader.h"

std::string inputfile = "cornell_box.obj";
tinyobj::attrib_t attrib;
std::vector<tinyobj::shape_t> shapes;
std::vector<tinyobj::material_t> materials;

std::string warn;
std::string err;

bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err, inputfile.c_str());

if (!warn.empty()) {
  std::cout << warn << std::endl;
}

if (!err.empty()) {
  std::cerr << err << std::endl;
}

if (!ret) {
  exit(1);
}

// Loop over shapes
for (size_t s = 0; s < shapes.size(); s++) {
  // Loop over faces(polygon)
  size_t index_offset = 0;
  for (size_t f = 0; f < shapes[s].mesh.num_face_vertices.size(); f++) {
    size_t fv = size_t(shapes[s].mesh.num_face_vertices[f]);

    // Loop over vertices in the face.
    for (size_t v = 0; v < fv; v++) {
      // access to vertex
      tinyobj::index_t idx = shapes[s].mesh.indices[index_offset + v];

      tinyobj::real_t vx = attrib.vertices[3*size_t(idx.vertex_index)+0];
      tinyobj::real_t vy = attrib.vertices[3*size_t(idx.vertex_index)+1];
      tinyobj::real_t vz = attrib.vertices[3*size_t(idx.vertex_index)+2];

      // Check if `normal_index` is zero or positive. negative = no normal data
      if (idx.normal_index >= 0) {
        tinyobj::real_t nx = attrib.normals[3*size_t(idx.normal_index)+0];
        tinyobj::real_t ny = attrib.normals[3*size_t(idx.normal_index)+1];
        tinyobj::real_t nz = attrib.normals[3*size_t(idx.normal_index)+2];
      }

      // Check if `texcoord_index` is zero or positive. negative = no texcoord data
      if (idx.texcoord_index >= 0) {
        tinyobj::real_t tx = attrib.texcoords[2*size_t(idx.texcoord_index)+0];
        tinyobj::real_t ty = attrib.texcoords[2*size_t(idx.texcoord_index)+1];
      }
      // Optional: vertex colors
      // tinyobj::real_t red   = attrib.colors[3*size_t(idx.vertex_index)+0];
      // tinyobj::real_t green = attrib.colors[3*size_t(idx.vertex_index)+1];
      // tinyobj::real_t blue  = attrib.colors[3*size_t(idx.vertex_index)+2];
    }
    index_offset += fv;

    // per-face material
    shapes[s].mesh.material_ids[f];
  }
}

Example code (New Object Oriented API)

#define TINYOBJLOADER_IMPLEMENTATION // define this in only *one* .cc
// Optional. define TINYOBJLOADER_USE_MAPBOX_EARCUT gives robust trinagulation. Requires C++11
//#define TINYOBJLOADER_USE_MAPBOX_EARCUT
#include "tiny_obj_loader.h"


std::string inputfile = "cornell_box.obj";
tinyobj::ObjReaderConfig reader_config;
reader_config.mtl_search_path = "./"; // Path to material files

tinyobj::ObjReader reader;

if (!reader.ParseFromFile(inputfile, reader_config)) {
  if (!reader.Error().empty()) {
      std::cerr << "TinyObjReader: " << reader.Error();
  }
  exit(1);
}

if (!reader.Warning().empty()) {
  std::cout << "TinyObjReader: " << reader.Warning();
}

auto& attrib = reader.GetAttrib();
auto& shapes = reader.GetShapes();
auto& materials = reader.GetMaterials();

// Loop over shapes
for (size_t s = 0; s < shapes.size(); s++) {
  // Loop over faces(polygon)
  size_t index_offset = 0;
  for (size_t f = 0; f < shapes[s].mesh.num_face_vertices.size(); f++) {
    size_t fv = size_t(shapes[s].mesh.num_face_vertices[f]);

    // Loop over vertices in the face.
    for (size_t v = 0; v < fv; v++) {
      // access to vertex
      tinyobj::index_t idx = shapes[s].mesh.indices[index_offset + v];
      tinyobj::real_t vx = attrib.vertices[3*size_t(idx.vertex_index)+0];
      tinyobj::real_t vy = attrib.vertices[3*size_t(idx.vertex_index)+1];
      tinyobj::real_t vz = attrib.vertices[3*size_t(idx.vertex_index)+2];

      // Check if `normal_index` is zero or positive. negative = no normal data
      if (idx.normal_index >= 0) {
        tinyobj::real_t nx = attrib.normals[3*size_t(idx.normal_index)+0];
        tinyobj::real_t ny = attrib.normals[3*size_t(idx.normal_index)+1];
        tinyobj::real_t nz = attrib.normals[3*size_t(idx.normal_index)+2];
      }

      // Check if `texcoord_index` is zero or positive. negative = no texcoord data
      if (idx.texcoord_index >= 0) {
        tinyobj::real_t tx = attrib.texcoords[2*size_t(idx.texcoord_index)+0];
        tinyobj::real_t ty = attrib.texcoords[2*size_t(idx.texcoord_index)+1];
      }

      // Optional: vertex colors
      // tinyobj::real_t red   = attrib.colors[3*size_t(idx.vertex_index)+0];
      // tinyobj::real_t green = attrib.colors[3*size_t(idx.vertex_index)+1];
      // tinyobj::real_t blue  = attrib.colors[3*size_t(idx.vertex_index)+2];
    }
    index_offset += fv;

    // per-face material
    shapes[s].mesh.material_ids[f];
  }
}

Optimized loader

Optimized multi-threaded .obj loader is available at experimental/ directory. If you want absolute performance to load .obj data, this optimized loader will fit your purpose. Note that the optimized loader uses C++11 thread and it does less error checks but may work most .obj data.

Here is some benchmark result. Time are measured on MacBook 12(Early 2016, Core m5 1.2GHz).

Rungholt scene(6M triangles)
- old version(v0.9.x): 15500 msecs.
- baseline(v1.0.x): 6800 msecs(2.3x faster than old version)
- optimised: 1500 msecs(10x faster than old version, 4.5x faster than baseline)

Python binding

$ python -m pip install tinyobjloader

See python/sample.py for example use of Python binding of tinyobjloader.

CI + PyPI upload

cibuildwheels + twine upload for each git tagging event is handled in Github Actions and Cirrus CI(arm builds).

How to bump version(For developer)

Bump version in CMakeLists.txt
Commit and push release. Confirm C.I. build is OK.
Create tag starting with v(e.g. v2.1.0)
git push --tags
- version settings is automatically handled in python binding through setuptools_scm.
- cibuildwheels + pypi upload(through twine) will be automatically triggered in Github Actions + Cirrus CI.

Tests

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

Project details

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Project links

Homepage

Release history Release notifications | RSS feed

2.0.0rc13 pre-release

Jan 26, 2024

2.0.0rc12 pre-release

Jan 26, 2024

This version

2.0.0rc11 pre-release

Jan 25, 2024

2.0.0rc9 pre-release

Aug 27, 2021

2.0.0rc8 pre-release

Nov 19, 2020

2.0.0rc7 pre-release

Aug 15, 2020

2.0.0rc6 pre-release

May 28, 2020

2.0.0rc5 pre-release

Feb 26, 2020

0.1

May 17, 2019

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Download URL: tinyobjloader-2.0.0rc11.tar.gz
Upload date: Jan 25, 2024
Size: 996.6 kB
Tags: Source
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/4.0.2 CPython/3.11.7

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tinyobjloader 2.0.0rc11

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tinyobjloader

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Old version

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New version(v1.0.x)

Old version(v0.9.x)

Features

Primitives

Material

TODO

License

Third party licenses.

Usage

Installation

Building tinyobjloader - Using vcpkg(not recommended though)

Data format

float data type

Robust triangulation

Example code (Deprecated API)

Example code (New Object Oriented API)

Optimized loader

Python binding

CI + PyPI upload

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Algorithm	Hash digest
SHA256	`4ac4bb21edf4bf5214939fee6b0aa084d297c154c6b4352805b4b27b7f362aeb`
MD5	`ace6a4b45b095717edc8aa26c47feb3f`
BLAKE2b-256	`28ec1a783dac4883705aa6498e7ce97c248b81cfcc23620f51ac7e1d329e5c92`

Algorithm	Hash digest
SHA256	`b387b3e90f7b657b8f1da6d677585853f72f5f34929bbb1afc8b73bb840675f4`
MD5	`696fe5567a8fc23ee31e78225d305815`
BLAKE2b-256	`500307d8c8f544d959628d97cd454bc80fd76d9c32a407e7cc3a7e85d114a95f`

Algorithm	Hash digest
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MD5	`ffe10d763db555d2ebcef979027afc93`
BLAKE2b-256	`17cbfcd9abfbef8e68a6f5db3178a87cdd618a9927873a04c3b30ed4f8ec7b87`

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MD5	`789a56d8371144b1ce0fdab44dc91b24`
BLAKE2b-256	`03ada54ebdf04d452c4f091bbb3e5838f71732cbf3c7c2a78688aa931a823a47`

Algorithm	Hash digest
SHA256	`fc8dc48044296269b86a4bef4a329fe2cdfd4cc831a14772283adef9add8a015`
MD5	`01fa5bf153a5f4ba1a705757c3b2debb`
BLAKE2b-256	`3a5d20e9f4af0727e8f2ad6388abbc45b80001ed0878a3718d8135c18d47d72f`

Algorithm	Hash digest
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MD5	`77c31d7f95726b33cf79a393e7732f7c`
BLAKE2b-256	`10c570d4c20533ac0ccc45e7a2f7fb6310c61b12e80fc084739d0ad55e843f00`

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MD5	`45f1bbc215d25b50d53d1740472411bb`
BLAKE2b-256	`692e62ef6fc12379cecf6644d4d15d796b38e5509a24b1d6c1e2856bc97f50ee`

Algorithm	Hash digest
SHA256	`f62559d123d5647af343fa5364c4013b9303ddd584bd697bdf551ef5beed6718`
MD5	`af077fb1cb159aeea0dadf0d4240769c`
BLAKE2b-256	`eca9caebac03983747d5112c525937370a089a889bda26b303065eb94cac4d42`

Algorithm	Hash digest
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MD5	`38ac56d3c9da2e783465741007b6bbd6`
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Algorithm	Hash digest
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