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• GPU path tracing tutorial 3
• implementing a BVH acceleration structure on the GPU
• by Sam lapere, 2016
• More info and screenshots on http://raytracey.blogspot.co.nz/2016/01/gpu-path-tracing-tutorial-3-take-your.html
• BVH implementation based on real-time CUDA ray tracer by Thanassis Tsiodras,
• http://users.softlab.ntua.gr/~ttsiod/cudarenderer-BVH.html
• Interactive camera with depth of field and plastic (coat) material based on CUDA path tracer code
• by Peter Kutz and Yining Karl Li, https://github.com/peterkutz/GPUPathTracer
• Phong metal code based on "Realistic Ray Tracing" by Peter Shirley

Features:

• Fast interactive GPU path tracer
• progressive rendering
• support for diffuse, specular (mirror), refractive, acrylic/coat and metal Phong materials
• support for spheres and triangle meshes
• BVH acceleration structure built with SAH (Surface Area Heuristic) and binning
• interactive camera with mouse and keyboard controls
• anti-aliasing
• depth-of-field

Instructions for compiling with Visual Studio 2013/2015:

• install the CUDA 6.5/7/7.5 toolkit and choose integration with Visual Studio
• open VS2013/2015 (Express or any other version such as the free Community version)
• click New Project...
• select Visual C++, then General, then Empty Project
• right click on the project, select Build Dependies > Build Customizations
• select the CUDA 6.5 (or 7 or 7.5) checkbox, click OK
• in the project explorer window, right click on Source Files, select Add, C++ file, then change the name from "Source.cpp" to "cuda_pathtracer.cu"
• in the project explorer window, right click on the newly created cuda_pathtracer.cu file, select CUDA C++
• paste the code from cuda_pathtracer.cu in the file
• add the other .h (header) and .cpp files to the project
• right click on the project name, select Properties
• under Linker > Input > Additional Dependencies, add "cudart.lib" and "glew32.lib" (glew32.lib should be automatically found when the CUDA toolkit is installed, if not, you can manually add the path to Linker > General > Additional Library Directories, the path is something like "%NVSDKCOMPUTE_ROOT%\C\common\lib")
• disable SAFESEH by selecting NO in Linker > Advanced > Image Has Safe Exception Handlers
• select Build > Rebuild Solution
• run the program (at the moment there is no CUDA error checking, but so far everything has worked fine even when running the program for prolonged periods)