Vulkan-Path-Tracer

Physically based offline path tracer made in Vulkan with Ray Tracing Pipeline extension. It uses energy conserving BSDF with Diffuse, Dielectric, Metallic and Glass lobes + volumetric scattering. Renders can also be saved as png images.

System Requirements

• Windows 10 with MSVC or Linux with GCC (Only debian 12 with GCC 12.2 is tested)
• Either NVIDIA RTX 2000+ series or AMD RX 6000+ series to support all of the extensions below. You may check whether they're present on your device here, maybe it's possible to run on some older hardware.
  • VK_KHR_ray_query
  • VK_KHR_acceleration_structure
  • VK_KHR_ray_tracing_pipeline
  • VK_KHR_swapchain
  • VK_KHR_deferred_host_operations

Building

Prerequisites

• Vulkan SDK.
• Cmake 3.12
• C++ 20

Windows

git clone --recursive https://github.com/Zydak/Vulkan-Path-Tracer
cd Vulkan-Path-Tracer
mkdir build
cd build
cmake ..

Then open generated Visual Studio solution and build.

Linux

git clone --recursive https://github.com/Zydak/Vulkan-Path-Tracer
cd Vulkan-Path-Tracer
mkdir build
cd build
cmake ..
make

Executable will be in build/PathTracer/VulkanPathTracer.

Features Overview

• BSDF with importance sampling
• Energy compensation implemented according to [Turquin 2018] paper.
• HDR Environment Maps with importance sampling
• NEE for environment map light
• Volumetric scattering with importance sampling implemented according to Production Volume Rendering 2017
• Multiple Importance Sampling implemented according to Optimally Combining Sampling Techniques for Monte Carlo Rendering
• Textures and Normal Maps
• Editor
  • Changing material and path tracing properties at runtime
  • Loading your own scenes in any format supported by assimp
  • Exporting renders into .PNG files
• Post Processing
  • Bloom using Mip Maps
  • ACES tonemapping
• Anti Aliasing
• Depth of Field
• Russian roulette

If you're interested in details of the implementation of these features, look at Project Overview.

Gallery

References

Papers Implemented

• Sampling the GGX Distribution of Visible Normals
• Microfacet Models for Refraction through Rough Surfaces
• Importance Sampling Microfacet-Based BSDFs using the Distribution of Visible Normals
• A Reflectance Model For Computer Graphics
• Practical multiple scattering compensation for microfacet models
• Production Volume Rendering 2017
• Optimally Combining Sampling Techniques for Monte Carlo Rendering
• Scratch a pixel article on volumes

Models

• https://developer.nvidia.com/orca/amazon-lumberyard-bistro - Bistro
• https://www.intel.com/content/www/us/en/developer/topic-technology/graphics-research/samples.html - Sponza
• https://sketchfab.com/3d-models/screaming-dragon-head-3d-print-5712b52618f743b193bdd39459099f25 - Screaming Dragon Head
• https://sketchfab.com/3d-models/dog-statue-49d97ca2fbf34f85b6c88ae8ebc7514f - Dog Statue
• https://github.com/mmacklin/tinsel - Ajax
• https://polyhaven.com/hdris - Env Maps
• https://benedikt-bitterli.me/resources/ - Dragon
• https://wirewheelsclub.com/models/1965-ford-mustang-fastback/ - Mustang
• https://renderman.pixar.com/official-swatch - RenderMan teapot
• https://www.cgbookcase.com/ - Textures for teapots
• https://casual-effects.com/g3d/data10/ - Breakfast Room
• https://luxcorerender.org/example-scenes/ - Cannele & Fromage