Aligned Novel View Image and Geometry Synthesis via Cross-modal Attention Instillation

TL;DR

This paper presents a diffusion-based framework for aligned novel view synthesis that combines image and geometry generation using cross-modal attention distillation and geometry-aware conditioning, enabling high-fidelity 3D scene reconstruction.

Contribution

It introduces a novel cross-modal attention distillation technique and proximity-based mesh conditioning for improved aligned view synthesis and geometry prediction.

Findings

Achieves high-fidelity extrapolative view synthesis on unseen scenes.

Produces geometrically aligned colored point clouds for 3D completion.

Delivers competitive reconstruction quality in interpolation settings.

Abstract

We introduce a diffusion-based framework that performs aligned novel view image and geometry generation via a warping-and-inpainting methodology. Unlike prior methods that require dense posed images or pose-embedded generative models limited to in-domain views, our method leverages off-the-shelf geometry predictors to predict partial geometries viewed from reference images, and formulates novel-view synthesis as an inpainting task for both image and geometry. To ensure accurate alignment between generated images and geometry, we propose cross-modal attention distillation, where attention maps from the image diffusion branch are injected into a parallel geometry diffusion branch during both training and inference. This multi-task approach achieves synergistic effects, facilitating geometrically robust image synthesis as well as well-defined geometry prediction. We further introduce proximity-based mesh conditioning to integrate depth and normal cues, interpolating between point cloud and filtering erroneously predicted geometry from influencing the generation process. Empirically, our method achieves high-fidelity extrapolative view synthesis on both image and geometry across a range of unseen scenes, delivers competitive reconstruction quality under interpolation settings, and produces geometrically aligned colored point clouds for comprehensive 3D completion. Project page is available at https://cvlab-kaist.github.io/MoAI.