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arXiv · 2507.07733

RTR-GS: 3D Gaussian Splatting for Inverse Rendering with Radiance Transfer and Reflection

Yongyang Zhou·Fang-Lue Zhang·Zichen Wang·Lei Zhang
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Abstract

3D Gaussian Splatting (3DGS) has demonstrated impressive capabilities in novel view synthesis. However, rendering reflective objects remains a significant challenge, particularly in inverse rendering and relighting. We introduce RTR-GS, a novel inverse rendering framework capable of robustly rendering objects with arbitrary reflectance properties, decomposing BRDF and lighting, and delivering credible relighting results. Given a collection of multi-view images, our method effectively recovers geometric structure through a hybrid rendering model that combines forward rendering for radiance transfer with deferred rendering for reflections. This approach successfully separates high-frequency and low-frequency appearances, mitigating floating artifacts caused by spherical harmonic overfitting when handling high-frequency details. We further refine BRDF and lighting decomposition using an additional physically-based deferred rendering branch. Experimental results show that our method enhances novel view synthesis, normal estimation, decomposition, and relighting while maintaining efficient training inference process.

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Yongyang Zhou, Fang-Lue Zhang, Zichen Wang, Lei Zhang. 2025-07-10. RTR-GS: 3D Gaussian Splatting for Inverse Rendering with Radiance Transfer and Reflection. https://arxiv.org/abs/2507.07733

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