GraftRay: Physically Based Mesh Insertion into Gaussian Splatting Scenes via Path Tracing

GraftRay inserts mesh objects into indoor scenes reconstructed with 2D or 3D Gaussian Splatting, producing lighting and shadows that stay consistent across views. It recovers scene materials and normals with diffusion-based priors, models spatially extended emitters such as windows and lamps, and jointly path-traces the Gaussians and inserted meshes. On the FIPT benchmark, it reports state-of-the-art rendering fidelity and shadow accuracy over ComGS and EAG-PT.