PRTGaussian: Efficient Relighting Using 3D Gaussians with Precomputed Radiance Transfer
This enables real-time, free-viewpoint relighting for applications like VR/AR, though it appears incremental as it builds on existing 3D Gaussian and PRT techniques.
The paper tackles real-time relightable novel-view synthesis by combining 3D Gaussians with Precomputed Radiance Transfer, achieving fast and high-quality relighting for general objects on synthetic datasets.
We present PRTGaussian, a realtime relightable novel-view synthesis method made possible by combining 3D Gaussians and Precomputed Radiance Transfer (PRT). By fitting relightable Gaussians to multi-view OLAT data, our method enables real-time, free-viewpoint relighting. By estimating the radiance transfer based on high-order spherical harmonics, we achieve a balance between capturing detailed relighting effects and maintaining computational efficiency. We utilize a two-stage process: in the first stage, we reconstruct a coarse geometry of the object from multi-view images. In the second stage, we initialize 3D Gaussians with the obtained point cloud, then simultaneously refine the coarse geometry and learn the light transport for each Gaussian. Extensive experiments on synthetic datasets show that our approach can achieve fast and high-quality relighting for general objects. Code and data are available at https://github.com/zhanglbthu/PRTGaussian.