---
title: VEGA-3D Spatial Reasoning
emoji: 🧭
colorFrom: red
colorTo: gray
sdk: gradio
sdk_version: 5.49.1
app_file: app.py
short_description: 3D spatial reasoning VLM with video-diffusion 3D priors
python_version: "3.10"
startup_duration_timeout: 1h
pinned: false
---

# VEGA-3D · Spatial Reasoning

Interactive demo of [**VEGA-3D**](https://huggingface.co/H-EmbodVis/VEGA-3D-Spatial-Reasoning),
a spatial-reasoning multimodal LLM from the paper
[*Generation Models Know Space: Unleashing Implicit 3D Priors for Scene
Understanding*](https://huggingface.co/papers/2603.19235) (ECCV 2026).

VEGA-3D augments a Qwen2.5-VL backbone with **implicit 3D priors** extracted
from a frozen **Wan2.1-T2V-1.3B** video diffusion model. Intermediate
spatiotemporal features from the diffusion model are fused into the VLM via
token-level gated fusion, giving it stronger geometric and spatial
understanding of indoor scenes.

Upload a scene image (or a short scene video) and ask a spatial-reasoning
question.