  Neural Radiance Fields (NeRFs) have emerged as a popular approach for novel
view synthesis. While NeRFs are quickly being adapted for a wider set of
applications, intuitively editing NeRF scenes is still an open challenge. One
important editing task is the removal of unwanted objects from a 3D scene, such
that the replaced region is visually plausible and consistent with its context.
We refer to this task as 3D inpainting. In 3D, solutions must be both
consistent across multiple views and geometrically valid. In this paper, we
propose a novel 3D inpainting method that addresses these challenges. Given a
small set of posed images and sparse annotations in a single input image, our
framework first rapidly obtains a 3D segmentation mask for a target object.
Using the mask, a perceptual optimizationbased approach is then introduced that
leverages learned 2D image inpainters, distilling their information into 3D
space, while ensuring view consistency. We also address the lack of a diverse
benchmark for evaluating 3D scene inpainting methods by introducing a dataset
comprised of challenging real-world scenes. In particular, our dataset contains
views of the same scene with and without a target object, enabling more
principled benchmarking of the 3D inpainting task. We first demonstrate the
superiority of our approach on multiview segmentation, comparing to NeRFbased
methods and 2D segmentation approaches. We then evaluate on the task of 3D
inpainting, establishing state-ofthe-art performance against other NeRF
manipulation algorithms, as well as a strong 2D image inpainter baseline.
Project Page: https://spinnerf3d.github.io
