Interactive Path Tracer in CUDA.

• Sphere and triangle mesh primitives
• obj file loading
• BVH (bounding volume hierarchy) acceleration
• Edge-Avoiding À-Trous Wavelet Transform denoising

You need to have a recent version of C++ compiler (Visual Studio , GCC, or Clang), CMake 3.17+, CUDA Toolkit, and Conan package manager installed.

To install conan, you need have a recent Python installed, and then you can do:

$ pip install conan

Afterwards, you can invoke CMake in command line to build the project

$ mkdir build
$ cd build
$ cmake -DCMAKE_BUILD_TYPE=Release ..
$ cmake --build .

or alternatively use your IDE's CMake integration.

nvcc fatal : Cannot find compiler 'cl.exe' in PATH nvcc fatal : Could not set up the environment for Microsoft Visual Studio

The way NVCC parse Windows PATH environment variable seems to be brittle. A reliable way is to clear the Path variable and only set the location of cl.exe to the path. For example:

Path=C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133\bin\Hostx64\x64\

The executables should be under the bin directory of the build directory:

• cuda_pt is the main executable. The usage is cuda_pt [option] <filename>, where <filename> refers to scene files. By default, it executes in interactive mode, but with --output <output filename> option it runs in command line mode.
• test runs unit tests

One sample-per-pixel output	Edge-Avoiding À-Trous Wavelet Transform

This project consults the following resources and papers

• Ray Tracing in One Weekend book series
• Physically Based Rendering: From Theory To Implementation 3rd edition
• Course slides from University of Pennsylvania CIS 565 GPU Programming and Architecture and Dartmouth CS 87 Rendering Algorithms
• Denoising
  • Edge-Avoiding À-Trous Wavelet Transform for fast Global Illumination Filtering

This project uses the following excellent third-party dependencies

• CUDA SDK
• Thrust - High level CUDA algorithm library

• Assimp - Asset loading
• JSON for Modern C++ - Json loading
• stb - Image reading/writing

• glm - Math
• fmt - String Formatting
• cxxopts - Command Line Parsing
• tl-function-ref - A function_ref implementation

• Catch2 - Testing

• glad - OpenGL loader
• GLFW - Window and input
• Dear ImGui - GUI

This repository is released under the MIT license, see License for more information.