166 lines
5.7 KiB
Markdown
166 lines
5.7 KiB
Markdown
# tinyobjloader
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[](https://gitter.im/syoyo/tinyobjloader?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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[](https://travis-ci.org/syoyo/tinyobjloader)
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[](https://app.wercker.com/project/bykey/495a3bac400212cdacdeb4dd9397bf4f)
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[](https://ci.appveyor.com/project/syoyo/tinyobjloader/branch/master)
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[](https://coveralls.io/github/syoyo/tinyobjloader?branch=master)
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http://syoyo.github.io/tinyobjloader/
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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.
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`tinyobjloader` is good for embedding .obj loader to your (global illumination) renderer ;-)
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Notice!
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-------
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We have released new version v1.0.0 on 20 Aug, 2016.
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Old version is available `v0.9.x` branch https://github.com/syoyo/tinyobjloader/tree/v0.9.x
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## What's new
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* 20 Aug, 2016 : Bump version v1.0.0. New data strcutre and API!
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### Old version
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Previous old version is avaiable in `v0.9.x` branch.
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## Example
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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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* [examples/viewer/](examples/viewer) OpenGL .obj viewer
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## Use case
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TinyObjLoader is successfully used in ...
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### New version
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* Loading models in Vulkan Tutorial https://vulkan-tutorial.com/Loading_models
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* Your project here!
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### Old version
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* bullet3 https://github.com/erwincoumans/bullet3
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* pbrt-v2 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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* Awesome Bump http://awesomebump.besaba.com/about/
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* sdlgl3-wavefront OpenGL .obj viewer https://github.com/chrisliebert/sdlgl3-wavefront
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* pbrt-v3 https://github.com/mmp/pbrt-v3
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* cocos2d-x https://github.com/cocos2d/cocos2d-x/
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* Android Vulkan demo https://github.com/SaschaWillems/Vulkan
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* voxelizer https://github.com/karimnaaji/voxelizer
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* Probulator https://github.com/kayru/Probulator
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* OptiX Prime baking https://github.com/nvpro-samples/optix_prime_baking
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* FireRays SDK https://github.com/GPUOpen-LibrariesAndSDKs/FireRays_SDK
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* parg, tiny C library of various graphics utilities and GL demos https://github.com/prideout/parg
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* Opengl unit of ChronoEngine https://github.com/projectchrono/chrono-opengl
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## Features
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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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* Crease tag('t'). This is OpenSubdiv specific(not in wavefront .obj specification)
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* Callback API for custom loading.
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## TODO
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* [ ] Fix obj_sticker example.
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* [ ] More unit test codes.
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## License
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Licensed under MIT license.
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## Usage
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`attrib_t` contains single and linear array of vertex data(position, normal and texcoord).
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Each `shape_t` does not contain vertex data but contains array index to `attrib_t`.
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See `loader_example.cc` for more details.
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```c++
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#define TINYOBJLOADER_IMPLEMENTATION // define this in only *one* .cc
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#include "tiny_obj_loader.h"
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std::string inputfile = "cornell_box.obj";
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tinyobj::attrib_t attrib;
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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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bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &err, inputfile.c_str());
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if (!err.empty()) { // `err` may contain warning message.
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std::cerr << err << std::endl;
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}
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if (!ret) {
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exit(1);
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}
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// Loop over shapes
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for (size_t s = 0; s < shapes.size(); s++) {
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// Loop over faces(polygon)
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size_t index_offset = 0;
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for (size_t f = 0; f < shapes[s].mesh.num_face_vertices.size(); f++) {
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int fv = shapes[s].mesh.num_face_vertices[f];
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// Loop over vertices in the face.
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for (size_t v = 0; v < fv; v++) {
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// access to vertex
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tinyobj::index_t idx = shapes[s].mesh.indices[index_offset + v];
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float vx = attrib.vertices[3*idx.vertex_index+0];
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float vy = attrib.vertices[3*idx.vertex_index+1];
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float vz = attrib.vertices[3*idx.vertex_index+2];
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float nx = attrib.normals[3*idx.normal_index+0];
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float ny = attrib.normals[3*idx.normal_index+1];
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float nz = attrib.normals[3*idx.normal_index+2];
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float tx = attrib.texcoords[2*idx.texcoord_index+0];
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float ty = attrib.texcoords[2*idx.texcoord_index+1];
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}
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index_offset += fv;
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// per-face material
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shapes[s].mesh.material_ids[f];
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}
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}
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```
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## Optimized loader
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Optimized multi-threaded .obj loader is available at `experimental/` directory.
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If you want absolute performance to load .obj data, this optimized loader will fit your purpose.
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Note that the optimized loader uses C++11 thread and it does less error checks but may work most .obj data.
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Here is some benchmark result. Time are measured on MacBook 12(Early 2016, Core m5 1.2GHz).
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* Rungholt scene(6M triangles)
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* old version(v0.9.x): 15500 msecs.
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* baseline(v1.0.x): 6800 msecs(2.3x faster than old version)
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* optimised: 1500 msecs(10x faster than old version, 4.5x faster than basedline)
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## Tests
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Unit tests are provided in `tests` directory. See `tests/README.md` for details.
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