README

Implementation of a simple renderer based on ray tracing.

There are several settings that can be changed :

// line 177 - 178, int main()
int edgeSample = ...; // MSAA samples in perEdge
int rayAmount = ...; // Ray shot in one subpixel
int width = ...; // width of picture
int height = ...; // height of picture; If you want to get result quickly, we recommend 102 * 76。

// line 20 - 22, Vector3 Shade(Scene& scene, const Ray& ray, int depth)
const double stopPossiblity = ...; // R.R. possiblity of stop.
const int minDepth = ...; // light bounces at least for $minDepth$ times. Before this, R.R. will not trigger.
// If you want to limit the max bouncing times, you can simply add a constant $maxDepth$ and some other code.
const int minRefDepth = ...; // For a refractive object, path tracing will only choose one way; But ideally there should be at least 2 ways. Thus to make it realistic, we guarantee $minRefDepth$ times 2-way bouncing.

In the result picture, we set them as this :

int edgeSample = 4;
int rayAmount = 1000;
int width = 512;
int height = 380; 

const double stopPossiblity = 0.9;
const int minDepth = 5; 
const int minRefDepth = 2;

It needs about 1 hour to complete on Intel Core i7.

This project needs to set C++20 and OpenMP to compile and run (Please use optimization. In g++ , -O3 is recommended; In VS2019/MSVC, Release mode is recommended). For C++20, we only use pi in <numbers> and format in <format>, which can be changed easily if you cannot useC++20 now. However, at least C++17 should be supported.