A Diffusion Approach to Radiance Field Relighting using Multi-Illumination Synthesis

TL;DR

This paper presents a novel method for relighting radiance fields from single-illumination multi-view data by leveraging 2D diffusion models to synthesize multi-illumination datasets, enabling realistic 3D scene relighting.

Contribution

It introduces a diffusion-based data augmentation technique and a 3D Gaussian splat representation for relightable radiance fields from limited data.

Findings

Successfully relights synthetic and real scenes under different illumination conditions.

Uses diffusion priors to generate multi-illumination data from single-illumination captures.

Achieves multi-view consistency and realistic relighting results.

Abstract

Relighting radiance fields is severely underconstrained for multi-view data, which is most often captured under a single illumination condition; It is especially hard for full scenes containing multiple objects. We introduce a method to create relightable radiance fields using such single-illumination data by exploiting priors extracted from 2D image diffusion models. We first fine-tune a 2D diffusion model on a multi-illumination dataset conditioned by light direction, allowing us to augment a single-illumination capture into a realistic -- but possibly inconsistent -- multi-illumination dataset from directly defined light directions. We use this augmented data to create a relightable radiance field represented by 3D Gaussian splats. To allow direct control of light direction for low-frequency lighting, we represent appearance with a multi-layer perceptron parameterized on light direction. To enforce multi-view consistency and overcome inaccuracies we optimize a per-image auxiliary feature vector. We show results on synthetic and real multi-view data under single illumination, demonstrating that our method successfully exploits 2D diffusion model priors to allow realistic 3D relighting for complete scenes. Project site https://repo-sam.inria.fr/fungraph/generative-radiance-field-relighting/