Raytracing in C++

This is a personal project in which I incrementally build a raytracer, that I started to learn modern C++ and computer graphics. Going back at it from time to time !

Running the project

Requirements : CMake, Make, a modern C++ compiler (tested with G++ >= 9), OpenMP library (for multithreading).
Generate the Makefile by doing :
```
$ mkdir build
$ cd build
$ cmake ..
```
You can then compile and run the project with :
```
$ make raytracer
$ ./raytracer
```

If you want to change the rendered scene, you can do so in src/main.cpp.

Features supported

Global illumination via path tracing
Area lights
PBR material (inspired by Disney's & Blender's Principled Material although much less complete) supporting diffuse, metal, refractive and emissive
Multithreading (using OpenMP)
Importance sampling (for diffuse BRDF and area light sampling)
Firefly removal