Description

Lyrae • Physically-Based Real-Time Path Traced Shaderpack

📌 NOTICE: This project is currently in very early alpha stages. Expect issues, visual artifacts and varying performance. I have a huge roadmap. I'd appreciate any kind of feedback and your support!

Features

Real-Time Voxel Path Tracing
- Monte Carlo global illumination with multiple light bounces
- Fast voxel traversal via DDA algorithm
- AABB tracing for detailed sub-voxels
Sampling & Image Stability
- Low-discrepancy blue noise sampling
- Flexible SVGF denoiser pipeline
- Next Event Estimation (NEE) for explicit sun sampling
Physically-Based Materials
- Unified physically-based shading pipeline
- Support for LabPBR resource packs
Post-Processing
- Filmic tonemapping
- Color grading
- Auto exposure adjustment
- Chromatic aberration

Community

If you enjoy my shaderpack, you can support me & my studies here: Buy Me a Coffee ❤️

You can join the discord server here, share screenshots or provide feedback and report issues.

Attributions

Kirilpro6284: 0th ray optimization to start in fragment position.

PBR Support

Lyrae supports LabPBR 1.3 standard. So make sure to use a resourcepack with LabPBR material support, here's a list of resourcepacks on shaderlabs site.

Performance Tips

I tried to write detailed descriptions for all settings, so you can hover over them in-game for more detailed performance tips.
Samples is one setting with the most impact on the performance, because it increases the path complexity exponentially. Try to keep this at 1 if you want to enjoy real-time.
You can try changing the Resolution Scale setting, lowering this from 100% will make the lighting quality lower.
For most scenarios 3 bounces is enough. 2 bounces will not have indirect lighting, so GI will look less accurate.
If you are in a completely isolated room where no sunlight is visible, you can try disabling NEE. Note that disabling NEE will break sun light.
You generally shouldn't mess with SVGF settings unless you know what you're doing. If you are okay with noisy image you can disable spatial filtering.