MrNeRF (@janusch_patas)
2025-12-10 | โค๏ธ 48 | ๐ 4
HybridSplat: Fast Reflection-baked Gaussian Tracing using Hybrid Splatting
Abstract: Rendering complex reflections of real-world scenes using 3D Gaussian splatting has been a promising solution for photorealistic novel view synthesis. However, it still faces bottlenecks, especially in rendering speed and memory storage.
This paper proposes a new Hybrid Splatting (HybridSplat) mechanism for Gaussian primitives. Our key idea is a new reflection-baked Gaussian tracing, which bakes the view-dependent reflection within each Gaussian primitive while rendering the reflection using tile-based Gaussian splatting. We then integrate the reflective Gaussian primitives with base Gaussian primitives using a unified hybrid splatting framework for high-fidelity scene reconstruction.
Moreover, we introduce pipeline-level acceleration for hybrid splatting and reflection-sensitive Gaussian pruning to reduce model size, achieving faster rendering speed and lower memory storage while preserving reflection quality.
By extensive evaluation, our HybridSplat accelerates rendering by about 7x across complex reflective scenes from Ref-NeRF and NeRF-Casting, with 4x fewer Gaussian primitives than similar ray-tracing based Gaussian splatting baselines. This serves as a new state-of-the-art method, especially for complex reflective scenes.
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