davepagurek / raytracer

A Monte Carlo 3D renderer

Raytracer

This is a Monte Carlo style 3d renderer (so the more samples you use, the closer to a perfect render it gets.) Here are some images I've rendered with it so far:

Features

• Shapes
  • Sphere
  • Plane
  • Triangle
    • Rectangle
    • Rectangular prism
  • Volumes of any other shape
• Materials
  • Diffuse
  • Reflective
  • Refractive
  • Light emitter
  • Volumes
  • Subsurface Scattering
• Lens blur
• Motion blur

Usage

Edit Sources/Raytracer/main.swift to change the size of the image, objects, etc. Then run the raytracer:

swift build
.build/debug/Raytracer

Explanation

A general overview of ratracing: http://www.davepagurek.com/blog/how-raytracing-works

Subsurface scattering: http://www.davepagurek.com/blog/volumes-subsurface-scattering

Antialiasing

Antialiasing works by first rendering an image, then applying a find edges filter, and then rerendering edge areas at a sub-pixel level.

Here is a detail of the original depth image:

Edges are found by subtracting a blurred version from the original:

Then, those areas are rerendered at double the pixel density to smooth the edges: