ray-tracer-hs

A ray tracer written from scratch in Haskell, following the Ray Tracing in One Weekend book series. My first time doing anything graphics-related, honestly.

what it can do

• Materials -- lambertian (diffuse), metals, dielectrics (glass), and emissive lights
• Textures -- solid colors, checkerboard patterns, image textures, Perlin noise
• Geometry -- spheres, quads, boxes, and rotations/translations of all of them
• Volumetrics -- constant density mediums (fog, smoke)
• BVH -- bounding volume hierarchy so it doesn't take literally forever
• PDF sampling -- importance sampling for cleaner images with less noise
• Motion blur -- moving spheres between frames
• Defocus blur -- depth of field / bokeh

scenes

There are 10 built-in scenes you can render. Here are some of them:

Perlin noise spheres	Emissive lighting
Cornell box with glass	Final scene -- a bit of everything

building & running

You'll need GHC and Cabal. Then:

cabal build

Pick a scene (1-10) and an output file:

cabal run ray-tracer-hs -- 1 bouncing_spheres.ppm

The full list:

#	Scene
1	Bouncing spheres
2	Checkered spheres
3	Earth
4	Perlin spheres
5	Quads
6	Simple light
7	Cornell box
8	Cornell smoke
9	Final scene
10	Cornell box with glass

Output is PPM format. You can convert to other formats with ImageMagick or just open it with Preview on macOS.