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Toy Path Tracer

Toy path tracer for my own learning purposes, using various approaches/techs. Somewhat based on Peter Shirley's Ray Tracing in One Weekend minibook (highly recommended!), and on Kevin Beason's smallpt.

I decided to write blog posts about things I discover as I do this, currently:

Right now: can only do spheres, no bounding volume hierachy of any sorts, a lot of stuff hardcoded.

Implementations I'm playing with:

  • C++: PC 136, Mac 37.8 Mray/s,
  • C++ with ISPC:
    • AVX2: PC 246, Mac 90 Mray/s,
    • SSE4: PC 200, Mac 56.6 Mray/s,
  • C# (.NET Core): PC 67, Mac 17.5 Mray/s,
  • C# (Unity, Mono): PC 13.3, Mac 4.6 Mray/s,
  • C# (Unity, IL2CPP): PC 28.1, Mac 17.1 Mray/s,
  • C# (Unity, JobSystem+Burst+Mathematics targeting SSE4): PC 164, Mac 48.1 Mray/s.

"PC" is AMD ThreadRipper 1950X 3.4GHz (SMT disabled, 16c/16t), "Mac" is late 2013 MacBookPro 2.3GHz (4c/8t).

A lot of stuff in the implementation migth be totally suboptimal or using the tech (e.g. ISPC) in a "wrong" way. Unity+Burst implementation is likely both suboptimal, and using a super-super-early version of the Burst compiler too.

I know it's just a simple toy, ok :)

Screenshot

Building

  • C++ projects: Windows (Visual Studio 2017) in Cpp/Windows/TestCpu.sln, Mac (Xcode 9) in Cpp/Mac/Test.xcodeproj.
    • ISPC branches need [ISPC binaries] to be in Cpp/ispc.exe (Win) and Cpp/ispc (Mac). I used version 1.9.2.
    • Windows is a simple Win32 app that displays image via GDI (that part is not terribly fast).
    • Mac is a Metal app that displays result as a fullscreen texture.
  • C# project in Cs/TestCs.sln. A command line app that renders some frames and dumps out final TGA screenshot at the end.
  • Unity project in Unity. I used 2018.1 beta 12 version linked to from ECS samples.