Nexus BVH
This project was developed as part of the GPU Computing course at Ensimag. The full report can be found here.
Nexus BVH is a fast and high-quality GPU BVH builder written in C++ and CUDA. It implements H-PLOC [Benthin et al. 2024] algorithm, focusing on high-performance and high-quality hierarchy generation.
BVH Construction Benchmark
All times are in milliseconds and represent kernel execution times measured on the CPU side. Benchmarked on a Ryzen 7 5700X, RTX 3070 8 Go.
BVH2 refers to the H-PLOC kernel with a search radius of 8. Radix sort is performed using 32-bit Morton codes. When using 64-bit Morton codes, sorting time is approximately 3x slower.
| Scene (Triangles) | Scene Bounds | Morton Codes | Radix Sort | BVH2 | Total |
|---|---|---|---|---|---|
| Sponza (0.3M) | 0.06 | 0.04 | 0.22 | 0.37 | 0.68 |
| Buddha (1.1M) | 0.22 | 0.14 | 0.37 | 1.05 | 1.78 |
| Hairball (2.9M) | 0.55 | 0.31 | 0.89 | 2.01 | 3.86 |
| Bistro (3.8M) | 0.59 | 0.31 | 1.02 | 2.66 | 4.58 |
| Powerplant (12.7M) | 2.52 | 1.31 | 3.59 | 8.85 | 16.27 |
| Lucy (28.1M) | 5.78 | 3.07 | 7.98 | 22.2 | 39.03 |
Prerequisites
- Microsoft Visual Studio 2022
- Nvidia CUDA Toolkit
- CMake 3.22 or higher
Build
- Clone the repository
git clone https://github.com/StokastX/NexusBVH -
Run setup.bat to automatically generate a Visual Studio solution in the build/ directory.
Alternatively, you can generate the solution via cmake:
mkdir build cd build cmake .. - Open the Visual Studio solution and build the project
Resources
- H-PLOC: [Benthin et al. 2024]
- PLOC++: [Benthin et al. 2022]
- PLOC: [Meister and Bittner 2018]
- Bottom-up LBVH traversal: [Apetrei 2014]