arXiv Computer Vision By Jinxin Ai, Matthias Niessner

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

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GraftRay is a method for inserting mesh objects into scenes reconstructed with 2D or 3D Gaussian splatting, ensuring physically consistent lighting and shadows. It recovers scene materials and normals using diffusion priors, models spatially‑extended emitters in closed form, and employs a hybrid renderer that path‑traces both Gaussians and meshes to produce view‑consistent shading, interreflections, and soft shadows. On the FIPT benchmark, GraftRay achieves state‑of‑the‑art rendering fidelity and shadow accuracy while remaining competitive in rendering efficiency.

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