PathTracer

Description

Creating a small path tracer based heavily off of PBRT's path tracer and book

Features

• Spatial data structure: BVH using axis aligned bounding boxes. Defaults to using the surface area heuristic during construction.
• For the path tracer, just diffuse Lambertian surfaces currently
• Importance sampling for the next ray direction, and the direct lighting estimation
• Supported shapes: triangle, sphere
• Supported lights: point, directional, area (defaults to 16 samples per area light for soft shadows)
• 3D model loading via Assimp
• Environment maps
• Configurable multisample anti-aliasing patterns
• Tonemapping and gamma correction
• Diffuse textures (no texture filtering/anti-aliasing yet)

Configuring

Tested on GCC9 and MSVC 2019

git clone https://github.com/LiamTyler/PathTracer.git
cd PathTracer
mkdir build
cd build
(linux) cmake -DCMAKE_BUILD_TYPE=[Debug/Release] ..
(windows) cmake -G "Visual Studio 16 2016" -A x64 ..

Building

Tested on GCC9 and MSVC 2019

Any platform:

cmake --build . --config [Debug/Release]

Linux specifc:

make -j6

Note: With GCC9 a full parallel build (make -j) freezes during the Assimp build on my machine. Just lower the number if it does freeze

Windows: Just open build/PathTracer.sln and build there

Running

./bin/pathTracer[_debug] <path to scene file> (ex: ../resources/scenes/cornell.json)

Example Output:

resources/scenes/cornell.json