Tungsten is a physically based renderer originally written for the yearly renderer competition at ETH. It simulates full light transport through arbitrary geometry based on unbiased integration of the rendering equation using path tracing.
Tungsten is written in C++11 and makes use of Intel's high-performance geometry intersection library embree. Tungsten takes full advantage of multicore systems and tries to offer good performance through frequent benchmarking and optimization. At least SSE3 support is required to run the renderer.
Documentation is planned, but currently unavailable (sorry!). A lengthy overview of features is available in the final project report written as part of the submission for the rendering competition, although that document may be outdated.
A small example JSON scene file can be found in assets/materialtest. It also contains the Tungsten material test ball that you can use to test different materials and lighting setups.
To give developers as much freedom as is reasonable, Tungsten is distributed under the libpng/zlib license. This allows you to modify, redistribute and sell all or parts of the code without attribution.
Note that Tungsten includes several third-party libraries in the src/thirdparty folder that come with their own licenses. Please see the LICENSE.txt file for more information.
To build using MinGW, you will need a recent CMake + gcc version. CMake binary distributions are available here. I recommend using MinGW-w64 available here.
In the root folder of the repo, use these commands in an MSYS shell to build:
./setup_builds
cd builds/release
make
The binaries will be placed in the build/release directory after buiding.
Optionally, you can install the Qt framework to build the scene editor utility. If Qt is not detected during setup, the scene editor will not be built (you will still be able to use the renderer).
To build using MSVC, you will need a recent CMake version and MSVC 2013. CMake binary distributions are available here.
After installing CMake, double click the setup_builds.bat file. The MSVC project will be created in the folder vstudio. Open the vstudio/Tungsten.sln solution and press F7 to build.
Building on Linux works just like building on MINGW.
The core renderer can be invoked using
tungsten scene.json
You can also queue up multiple scenes using
tungsten scene1.json scene2.json scene3.json
and so forth. All renderer parameters, including output files, are specified in the json file.
You can test your local build by rendering the material test scene in assets/materialtest/materialtest.json.
src/core/ contains all the code for primitive intersection, materials, sampling, integration and so forth. It is the beefy part of the renderer and the place to start if you're interested in studying the code.
src/thirdparty contains all the libraries used in the project. They are included in the repository, since most of them are either tiny single-file libraries or, in the case of embree, had to be modified to work with the renderer.
src/standalone contains the rendering application itself, which is just a small command line interface to the core rendering code.
All other folders in src are small utilities described below.
Apart from the core renderer, Tungsten also comes with several tools to make content creation easier.
The command
obj2json srcFile.obj dstFile.json
will parse the Wavefront OBJ srcFile.obj, including object hierarchy and materials, and create a scene file dstFile.json reproducing hierarchy and material assignments.
In addition, meshes in the OBJ file will be automatically converted and saved to Tungsten's native *.wo3 mesh format, which significantly reduces loading time for large meshes. This may create a large number of new files - consider pointing the dstFile.json path into an empty subfolder to avoid file clutter.
The command
json2xml srcFile.json dstFile.xml
will parse the scene file srcFile.json and convert it to an XML scene description compatible with the Mitsuba renderer. All *.wo3 files will be converted to Mitsuba compatible OBJs, which may create a large number of new files - consider putting dstFile.xml into an empty subfolder to avoid file clutter.
Note that this tool does not experience heavy testing and does not support all features of Tungsten, so it may not always work as expected.
This is a minimalist scene editor written in Qt and OpenGL. It supports camera setup, manipulating transforms, compositing scenes and a few more features that I found useful.
It is usable, but a few crucial features are currently missing from it (including documentation). The code is neither exceptionally clean nor stable, so use at your own risk.
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