Path Tracer

Cornell Box

Features

• Unbiased Monte Carlo Path tracer.
• Lambertian, Dielectric and Mirror BRDF.
• Antialiasing via jittered supersampling.

Build Instructions

The project uses CMake (minimum version 3.9) for generating build files. For building the project:

• Clone the repository (or download the zip file)

  git clone https://github.com/vermaditya1999/PathTracer.git
  

• With CMake it generally recommended to create an out-of-source build, and so do we. Create a folder build in the root directory

  cd PathTracer
  mkdir build
  cd build
  

• By default, CMake will build in Release mode (optimized). To build in Debug mode set the -DCMAKE_BUILD_TYPE=Debug flag with the cmake command.

  cmake ..
  

• Now run make to create the executable

  make
  

An executable PathTracer should be created in the build directory.

Running the program

Run the program using ./PathTracer while being in the build directory. The scene will be rendered as an image.ppm file in the build directory.

Setting the parameters

• Antialiasing: Change jg_size variable in the function void RealisticRenderer::render(Scene scene) in file src/RealisticRenderer.cpp
• Samples per pixel: Change n_samples variable in the function void RealisticRenderer::render(Scene scene) in file src/RealisticRenderer.cpp

Changing the scene

There are two sample scenes provided in the code:

• Luminaire on the top of diffused ball. [SCENE ID = 1]
• Cornell Box. [SCENE ID = 0]

The scenes can be switched by changing the scene_id variable in src/main.cpp.