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RayTracerHowTo

A handwritten ray tracer with clean and well-annotated C++ implementation for systematic learning toward Computer Graphics.

Supported Features

  • 5 geometries: Moller-Trumbore algorithm for Triangle and MeshTriangle, Parametric Equation for Sphere, Cylinder and Cone.
  • 4 materials: Diffuse, Reflection, Refraction and Fresnel Effect.
  • 2 lights: Point light and Surface light, both available in both Whitted-style Ray Tracing and Path Tracing.
  • Pinhole Camera Model.
  • Acceleration with Bounding Volume Hierarchy (BVH) and Surface Area Heuristic (SAH) and Axis-Aligned Bounding Box (AABB).
  • Acceleration with multiple threading.
  • Whitted-Style Ray Tracing.
  • Path Tracing.
  • Gamma Correction.

Get Started

  • From source
# more build details see `Development`
git clone https://github.com/dadadadawjb/RayTracerHowTo.git
cd RayTracerHowTo
mkdir build
cd build
cmake ..
make

./RayTracerHowTo
  • From release binary
# download from https://github.com/dadadadawjb/RayTracerHowTo/releases as `RayTracerHowTo`

./RayTracerHowTo

Results

  • Whitted-Style Ray Tracing, around 5s

WhittedRayTracing

  • Path Tracing, 1024 SPP around 50min, 32 SPP around 70s

PathTracing

  • Whitted-Style Ray Tracing step-by-step

whitted_light1whitted_light2whitted_diffusewhitted_rrwhitted_reflectwhitted_refract

  • Path Tracing step-by-step

path_light1path_light2path_diffusepath_rrpath_reflectpath_refract

  • Global illumination effections

reflection_whittedreflection_path refraction_whittedrefraction_path fresnel_whittedfresnel_path shadow_whittedshadow_path bleeding1_pathbleeding2_path

Development

At present, the use of RayTracerHowTo is somehow awkward. The configurations are all set in global.hpp. Every time you changed, you should compile it again.

Another thing needed to notice is that, you need to make sure Eigen and OpenCV are installed, and set your path to Eigen inside CMakeLists.txt. Also for easier experience, I do not ignore .vscode which provides C/C++ intellisense and build configuration, you need to set your path to Eigen and OpenCV.

Note

The skeleton is taken from GAMES101 by Lingqi Yan.