Blended-NeRF: Zero-Shot Object Generation and Blending in Existing Neural Radiance Fields

TL;DR

Blended-NeRF introduces a novel framework for local 3D scene editing and object blending in NeRFs using text prompts, volumetric blending, and geometric priors, enabling realistic, view-consistent modifications.

Contribution

It presents a new method for local 3D scene editing in NeRFs guided by text prompts and 3D ROI, with volumetric blending and geometric priors for improved realism.

Findings

Achieves realistic, multi-view consistent edits in 3D scenes.

Demonstrates flexibility in adding, removing, or altering objects.

Outperforms baselines in visual fidelity and diversity.

Abstract

Editing a local region or a specific object in a 3D scene represented by a NeRF or consistently blending a new realistic object into the scene is challenging, mainly due to the implicit nature of the scene representation. We present Blended-NeRF, a robust and flexible framework for editing a specific region of interest in an existing NeRF scene, based on text prompts, along with a 3D ROI box. Our method leverages a pretrained language-image model to steer the synthesis towards a user-provided text prompt, along with a 3D MLP model initialized on an existing NeRF scene to generate the object and blend it into a specified region in the original scene. We allow local editing by localizing a 3D ROI box in the input scene, and blend the content synthesized inside the ROI with the existing scene using a novel volumetric blending technique. To obtain natural looking and view-consistent results, we leverage existing and new geometric priors and 3D augmentations for improving the visual fidelity of the final result. We test our framework both qualitatively and quantitatively on a variety of real 3D scenes and text prompts, demonstrating realistic multi-view consistent results with much flexibility and diversity compared to the baselines. Finally, we show the applicability of our framework for several 3D editing applications, including adding new objects to a scene, removing/replacing/altering existing objects, and texture conversion.