I Wrote a Raytracer in C#

The only dependency is System.Drawing.Common.

It is very slow!

I use Parallel.ForEach to parallelize the rays, but ultimately we are doing billions of recursive vector operations on the CPU.

How to Run It

1. Clone the repository.
2. Open the Solution in Visual Studio 2019 or later with .Net 5 SDK installed.
3. Set Raytracer.Wpf as the startup project.
4. Run the project.

Projects

• Raytracer - Common library containing all of the math, scene descriptions, parsers, and utilities.
• Raytracer.Ascii - Renders scenes into a command line window in "realtime", looks kinda cool.
• Raytracer.Cmd - Renders scenes to bitmap file via command line.
• Raytracer.Wpf - Renders scenes to a window in "realtime".
• Raytracer.Tests - Minimal NUnit tests for Raytracer, helps verify 2 + 2 still equals 4.

Scene Features

• Cameras
  • Orthographic
  • Perspective
• Lights
  • Ambient
  • Directional
  • Point
• Geometry
  • Primitives
    • Capsule
    • Cube
    • Cylinder
    • Disc
    • Plane
    • Quad
    • Sphere
    • Triangle
  • Models
    • OBJ
  • CSG (Constructive Solid Geometry)
    • Difference
    • Intersection
    • Union
• Materials
  • Emissive
  • Lambert
  • Layered
  • Phong
  • Reflective
  • Refractive
• Textures
  • Bitmap
  • Checkerboard
  • Noise
  • Random
  • Solid Color

Renderer Features

• Texture Mapping
• Normal Mapping
• Anti-aliasing
• Global Illumination
• Ambient Occlusion
• Gamma correction
• Depth of Field
• Soft shadows
• Translucent shadows
• Subsurface Scattering
• Median Filtering
• Successive Refinement
• Bilinear Texture Filtering
• Bounding Volume Hierarchy

Examples

Translucent shadows, depth of field, subsurface scattering, normal mapping

Stacked CSG Union, Intersection, Difference operations

ASCII buffer - Translating light values to a mix of foreground and background terminal colours