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RT: Ray Tracing Engine

A ray tracing engine written from scratch in C++, with no external dependencies (except libpng). The first priority of this project has been to write readable code, so that it can be used as a learning tool.

Some sample renders

Sample render 1 Sample render 2 Sample render 3 Sample render 4

Implemented Features

Geometry:

  • Arbitrary object transformations
  • Wavefront OBJ parser
  • Two level Bounded Volume Hierarchies
  • Implicit surfaces through Ray Marching
  • Signed Distance Function intersections
  • Parametric Surfaces (Paraboloids, etc)*
  • Surfaces of revolution*
  • Beveled curves and knots*
  • Displacement mapped planes / spheres*
  • Basic L-Systems

* Converted to meshes

Shading:

  • Ambient Occlusion
  • Path tracing with next event estimation
  • Direct Lighting

Materials (Path tracing):

  • Specular reflection
  • Specular transmission
  • Lambertian
  • Oren Nayar
  • Sampled BRDFs (MERL)

Misc:

  • Procedurally generated textures
  • Depth of Field
  • Environment Maps
  • Volumetric surfaces

Some meshes from the following resource have been tested successfully: McGuire Computer Graphics Archive.

Currently the engine only supports PNG/PPM/BMP3 files, so if the textures included with the .obj file is in a different format, then use the provided script ./scripts/convert_images.sh

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