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Raytracing

Never did raytracing before, but tried it now and I’m hooked :-)

Gallery

Some images I have made so far:

Features

List of implemented features:s

• Basic Features
  • rays and viewport
  • camera position and orientation
  • depth-of-field
  • gamma correction (fixed 2.0 correction)
• Primitives and Meshes
  • spheres, boxes, planes
  • sphere UV mapping
  • triangle mesh rendering
  • volumes / fog
  • raymarched objects
  • generic materials: diffuse, metal, glass, checkered diffuse
  • procedural materials: fractals, etc.
  • textured objects (texture images)
• Rendering and optimisations
  • monte-carlo based sampling and materials
  • russian roulette early exit
  • multi-threaded rendering
  • rotated and translated objects, and re-used objects (instancing)
  • axis aligned box intersections
  • bounding volume hyrarchy hit optimisations for scene objects
  • bounding volume hyrarchy hit optimisations for triangles within a mesh
  • optional memory manager (optimised small object allocations) to ensure objects are located close together in main memory
• Advanced Features
  • cloud runner (tested on AWS and DigitalOcean)
  • procedural/textured lights

Todo:

• triangle mesh loading (see https://github.com/assimp/assimp)
• procedural content using noise (https://github.com/Auburn/FastNoiseLite)
• replace axis-math with matrix math
• add shadow rays
• optisation through importance sampling (for lights)
• data based optimisations
• de-noising
• z-buffer and rasterised debug views (like viewing BVH volumes)
• support larger scenarios rendering multiple frames or multiple scenes per cloud VM (specific to cloud runner)
• optimize cloud VM promisioning (cloud-local images, smaller images, faster building, etc.)

Feature blog

Ramblings on cool features and implementation details. And, actually trying to write something down makes me think of improvements.

• Rendering with Qt
• Building with CMAKE
• Running in the cloud with docker-machine
• Raytracing basics
• Random number generation
• Job system

• Debugging and compiler settings

• [Awesome C++] [TODO]
• Profiling and optimisations [WIP]
• Advanced Raytracing [WIP]
• Hit optimisations using a Bounding Volume Hyrarchy [WIP]
• Coordinates, Axis & Matrices [WIP]
• Camera Model [WIP]

Resources

• https://www.realtimerendering.com/intersections.html
• https://www.realtimerendering.com/raytracinggems/
• https://raytracing.github.io/
• https://www.scratchapixel.com/
• https://github.com/aras-p/ToyPathTracer