SDFusion: Multimodal 3D Shape Completion, Reconstruction, and Generation

TL;DR

SDFusion is a versatile framework that enables multimodal 3D shape completion, reconstruction, and generation, allowing users to interactively generate and modify 3D assets using images, text, and partial shapes.

Contribution

It introduces a flexible, multi-modal diffusion-based model that unifies various 3D shape tasks into a single system with adjustable input influence.

Findings

Outperforms prior methods on shape completion, image-based 3D reconstruction, and text-to-3D tasks.

Supports combined multi-modal inputs for interactive shape generation.

Provides an efficient way to texture generated shapes using large-scale text-to-image models.

Abstract

In this work, we present a novel framework built to simplify 3D asset generation for amateur users. To enable interactive generation, our method supports a variety of input modalities that can be easily provided by a human, including images, text, partially observed shapes and combinations of these, further allowing to adjust the strength of each input. At the core of our approach is an encoder-decoder, compressing 3D shapes into a compact latent representation, upon which a diffusion model is learned. To enable a variety of multi-modal inputs, we employ task-specific encoders with dropout followed by a cross-attention mechanism. Due to its flexibility, our model naturally supports a variety of tasks, outperforming prior works on shape completion, image-based 3D reconstruction, and text-to-3D. Most interestingly, our model can combine all these tasks into one swiss-army-knife tool, enabling the user to perform shape generation using incomplete shapes, images, and textual descriptions at the same time, providing the relative weights for each input and facilitating interactivity. Despite our approach being shape-only, we further show an efficient method to texture the generated shape using large-scale text-to-image models.