Title: FlashWorld: High-quality 3D Scene Generation within Seconds
Primary area: generative models
Keywords: 3D Scene Generation, Multi-view Diffusion Models, World Models, Distribution Matching Distillation

Abstract: We propose FlashWorld, a generative model that produces 3D scenes from a single image or text prompt in seconds, $10 \sim 100\times$ faster than previous works while possessing superior rendering quality.
Our approach shifts from the conventional multi-view-oriented (MV-oriented) paradigm, which generates multi-view images for subsequent 3D reconstruction, to a 3D-oriented approach where the model directly produces 3D Gaussian representations during multi-view generation.
While ensuring 3D consistency, 3D-oriented method typically suffers poor visual quality.
FlashWorld includes a dual-mode pre-training phase followed by a cross-mode post-training phase, effectively integrating the strengths of both paradigms.
Specifically, leveraging the prior from a video diffusion model, we first pre-train a dual-mode multi-view diffusion model, which jointly supports MV-oriented and 3D-oriented generation mode. 
To bridge the quality gap in 3D-oriented generation, we further propose a cross-mode post-training distillation by matching distribution from consistent 3D-oriented mode to high-quality MV-oriented mode. 
This not only enhances visual quality while maintaining 3D consistency, but also reduces the required denoising steps for inference.
Also, we propose a strategy to leverage massive single-view images and text prompts during this process to enhance the model's generalization to out-of-distribution inputs.
Extensive experiments demonstrate the superiority and efficiency of our method.

TL;DR: a generative model that produces high-quality 3D scenes from a single image or text prompt in seconds