Standalone C++ implementation of raytracing and rasterization, without external libraries or frameworks.

• The demos come from "Computer Graphics from Scratch" (book), which provides Javascript demos.
• Additionally implements features from "Extending the Raytracer" that weren't implemented in the original source code.

These demos are all written in FP32, as opposed to the original Javascript demos that use FP64 by default. This results in shadow acne in all raytracing demos after Raytracer 04. To fix this, I added an epsilon reflection ray bias (e.g., start the reflection ray at an epsilon offset along the surface normal). The previews below include this fix.

Raytracer 01 - Basic	Raytracer 02 - Diffuse	Raytracer 03 - Specular

Raytracer 04 - Shadow	Raytracer 05 - Reflection	Raytracer 06 - Camera

These implement various features from "Extending the Raytracer", which didn't previously have implementations.

Raytracer 07 - Triangle	Raytracer 08 - CSG	Raytracer 09 - Optimization

The C++ implementations below differ slightly from their Javascript counterparts to improve efficiency.

Raster 01 - Lines	Raster 02 - Lines (Fixed)	Raster 03 - Triangle

Raster 04 - Shading	Raster 05 - Perspective	Raster 06 - Cube

Raster 07 - Instances	Raster 08 - Homogenous	Raster 09 - Clipping

Raster 10 - Surface	Raster 11 - Shading	Raster 12 - Texture

Note: The instructions below assume you're in the repository root.

To get started, pick any demo script to build. For example, the first demo for raytracing is in demos/raytracer-01-basic.cpp. To build and run it, use the following

g++ demos/raytracer-01-basic.cpp -o main.out -std=c++20
./main.out
open output.bmp

This gives the following output, which matches the output from the original.

This Repo	Original Reference on the author's website

Before running raster-12-texture.cpp, download and convert the texture map using the provided Python script.

pip install Pillow requests
python tools/download_texture.py

Build and run all demos using the following, after installing Python dependencies above:

bash tools/run.sh

All scripts in this repository were tested using clang version 15.0.0.

❯ g++ --version
Apple clang version 15.0.0 (clang-1500.1.0.2.5)
Target: x86_64-apple-darwin23.2.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin