Lighthouse 2 framework for real-time ray tracing
Lighthouse 2 framework for real-time ray tracing
This is the public repo for Lighthouse 2, a rendering framework for real-time ray tracing / path tracing experiments. Lighthouse 2 uses a state-of-the-art wavefront / streaming ray tracing implementation to reach high ray througput on RTX hardware (using Optix 7.2) and pre-RTX hardware (using Optix 5 Prime) and soon on AMD hardware (using RadeonRays / OpenCL) and CPUs (using Embree). A software rasterizer is also included, mostly as an example of a minimal API implementation.
Quick pointers / Important advice:
Lighthouse 2 uses a highly modular approach to ease the development of renderers.
The main layers are:
Render cores have a common interface and are supplied to the RenderSystem as dlls. The RenderSystem supplies the cores with scene data (meshes, instances, triangles, textures, materials, lights) and sparse updates to this data.
The Lighthouse 2 project has the following target audience:
Researchers
Lighthouse 2 is designed to be a high-performance starting point for novel algorithms involving real-time ray tracing. This may include new work on filtering, sampling, materials and lights. The provided ray tracers easily reach hundreds of millions of rays per second on NVidia and AMD GPUs. Combined with a generic GPGPU implementation, this enables a high level of freedom in the implementation of new code.
Educators
The Lighthouse 2 system implements all the boring things such as scene I/O, window management, user interfaces and access to ray tracing APIs such as Optix, RadeonRays and Embree; your students can get straight to the interesting bits. The architecture of Lighthouse 2 is carefully designed to be easily accessible. Very fast scene loading and carefully tuned project files ensure quick development cycles.
Industry
Lighthouse 2 is an R&D platform. It is however distributed with the Apache 2.0 license, which allows you to use the code in your own products. Experimental cores can be shared with the community in binary / closed form, and application development is separated from core development.
What it is not
The ray tracing infrastructure (with related scene management acceleration structure maintenance) should be close to optimal. The implemented estimators however (unidirectional path tracers without filtering and blue noise) are not, and neither is the shading model (Lambert + speculars). This may or may not change depending on the use cases encountered. This video shows what can be achieved with the platform: https://youtu.be/uEDTtu2ky3o .
Lighthouse 2 should compile out-of-the-box on Windows using Visual Studio 2019. For the CUDA/Optix based cores CUDA 11.6 is required:
https://developer.nvidia.com/cuda-downloads
Make sure to chose the correct version (11.7).
Optix 5.x, 6.0 and 7.2 libraries are included in the Lighthouse 2 download and do not have to be downloaded separately.
For more information on Lighthouse 2 please visit: http://jacco.ompf2.com.
Credits
Lighthouse 2 was developed at the Utrecht University, The Netherlands.
Lighthouse 2 uses the following libraries:
Dear ImGui https://github.com/ocornut/imgui
FreeImage http://freeimage.sourceforge.net<br>
Glad https://glad.dav1d.de<br>
GLFW https://www.glfw.org<br>
half 1.12 http://half.sourceforge.net<br>
tinygltf https://github.com/syoyo/tinygltf
tinyobj https://github.com/syoyo/tinyobjloader
tinyxml2 https://github.com/leethomason/tinyxml2
zlib https://www.zlib.net
Contributions
Previous Work
Lighthouse 2 implements research by (very incomplete):