---
license: mit
pipeline_tag: image-to-3d
library_name: trellis2
language:
- en
tags:
- image-to-3d
- 3d-scene-generation
- indoor-scene
- 360-image
- panorama
- equirectangular
- inspace
- eccv2026
---

# InSpace: Structure-Aware 3D Indoor Scene Generation from a Single 360° Image

![InSpace teaser](figures/teaser.webp)

**Model Name:** InSpace

**Venue:** ECCV 2026

**Paper:** Coming soon

**Repository:** Coming soon

**Project Page:** Coming soon

## Introduction

**InSpace** is a structure-aware framework that generates a complete, **asset-aware** 3D indoor
scene, a full-room mesh together with the individual, separable furniture meshes and their PBR
materials, from a **single 360° equirectangular (ERP) panorama**.

Existing single image-to-3D methods focus on asset-level generation and neglect the structural
layout, which is essential for grounding assets in space. A single perspective image also lacks the
field of view to recover a coherent global layout. InSpace addresses this by operating on a 360° ERP
image and generating the scene in three cascaded flow-matching stages: (1) estimating **Partial
Scene Geometry (PSG)** as a spatial prior, (2) generating **coarse scene structure** with
**view-selective cross-attention**, and (3) producing **detailed layout and asset geometry with
textures** through a global-local hybrid attention.

InSpace is built on the [TRELLIS.2](https://huggingface.co/microsoft/TRELLIS.2-4B) O-Voxel
representation. This repository hosts only the four InSpace-finetuned components; the base VAEs and
decoders are pulled automatically from `microsoft/TRELLIS.2-4B` and `microsoft/TRELLIS-image-large`
at run time.

## Model Details

*   **Developed by:** Gwanhyeong Koo, Hyunsu Kim, Youngji Kim, Taejae Lee, Siwoo Lim, Sunjae Yoon,
    Suyong Yeon, Chang D. Yoo (KAIST, NAVER LABS, Chung-Ang University)
*   **Model Type:** Three-stage flow-matching framework on O-Voxel structured latents, with a
    CenterPoint-based 3D bounding-box estimator
*   **Input:** Single 360° equirectangular (ERP) panorama
*   **Output:** Complete 3D indoor scene (structural layout + separable, textured asset meshes with
    PBR materials)
*   **Base Model:** TRELLIS.2-4B (sparse-structure / shape / texture VAEs and decoders)

## Key Features

*   **Structure-aware scene generation:** Recovers a coherent global layout from a single 360° image,
    not just isolated assets.
*   **Asset-aware output:** The scene is decomposed into a *layout* (floor and walls) and *individual
    objects*, each exported as its own mesh rather than a single fused blob.
*   **View-selective cross-attention:** The panorama is unwrapped into 6 cubemap faces (FOV 120°), and
    each voxel attends only to the faces visible from its 3D position.
*   **Layout-Guided Structure Inversion (optional):** A monocular-depth (Depth-Anything-2) point
    cloud, the Partial Scene Geometry, seeds coarse generation via SDEdit-style noise inversion for
    better room-scale fidelity.
*   **PBR materials:** Base color, roughness, metallic, and opacity, inherited from the TRELLIS.2
    texture decoder.

## Checkpoints

| Folder | Component | Role | Size |
|--------|-----------|------|------|
| `erp_ss_flow_img_dit_L_16l8_bf16_spatial/` | Coarse geometry | Coarse scene structure (sparse-structure flow, view-selective cross-attention) | ~4.9 GB |
| `bbox_centerpoint/` | 3D BBox | Per-asset oriented bounding-box estimator (CenterPoint) | ~48 MB |
| `erp_slat_flow_img2shape_asset_aware_bf16/` | Asset shape | Asset-aware shape generation | ~4.9 GB |
| `erp_slat_flow_imgshape2tex_asset_aware_bf16/` | Asset texture | Asset-aware texture generation (PBR) | ~4.9 GB |

Each folder holds the EMA weight under `ckpts/`. Model configs ship with the code repository
(under `configs/`), so no `config.json` is needed here.

## Requirements

- **System:** Tested on **Linux**.
- **Hardware:** An NVIDIA GPU with at least 24 GB of memory (verified on NVIDIA A100 and H100).
- **Software:**
  - The [CUDA Toolkit](https://developer.nvidia.com/cuda-toolkit-archive) (recommended 12.4).
  - [Conda](https://docs.anaconda.com/miniconda/install/#quick-command-line-install) for managing dependencies.
  - Python 3.8 or higher.

## Usage

Please refer to the official GitHub repository for installation. InSpace is run through the
repository's scripts (`demo/app_inspace.py`, `eval/pipeline/eval_pipeline.py`), which load these
checkpoints and chain the multi-stage pipeline together. 

```sh
# 1. Get the code and set up the environment (same env as TRELLIS.2)
git clone <this-repo-url> --recursive && cd InSpace
. ./setup.sh --new-env --basic --flash-attn --nvdiffrast --nvdiffrec --cumesh --o-voxel --flexgemm

# 2. Download these checkpoints into checkpoints/
pip install -U "huggingface_hub[cli]"
hf download GwanHyeong/InSpace --local-dir checkpoints/

# 3a. Interactive demo (pick a scene, run the pipeline stage by stage)
python demo/app_inspace.py --port 7860

# 3b. Batch inference over the test set
python eval/pipeline/eval_pipeline.py \
    --data_dir datasets/ERP_3D_FRONT_test \
    --noise_mode sdedit --sdedit_alpha 0.5 --bbox_mode predicted --enable_texture
```

The inference code loads each checkpoint from `checkpoints/<folder>/ckpts/*.pt`; the matching model
config is read from the code repository's `configs/` directory.

## Dataset

InSpace is trained on **[ERP-FRONT-30K](https://huggingface.co/datasets/GwanHyeong/ERP-FRONT-30K)**,
a paired ERP-Image-to-3D indoor scene dataset built on 3D-FRONT, with **26.5K training** and **2.5K
test** ERP-image-mesh pairs (~30K total). Each room is paired with 360° ERP observations rendered
from inside the scene and covers a wide range of room sizes.

```sh
hf download GwanHyeong/ERP-FRONT-30K --repo-type dataset --local-dir datasets/
```

## Known Limitations

*   **Domain of training data:** InSpace is trained on ERP-FRONT (synthetic 3D-FRONT scenes). Results
    on real captured panoramas may vary; for real images the pipeline relies on monocular depth to build the Partial Scene Geometry.
*   **Raw mesh artifacts:** As with TRELLIS.2, generated raw meshes may occasionally contain small
    holes or minor topological discontinuities; mesh post-processing (hole-filling, remeshing) is
    provided.

## Citation

InSpace has been accepted to ECCV 2026. The official citation will be added here soon.

<!-- Citation pending final publication details.
```bibtex
@inproceedings{koo2026inspace,
  title     = {InSpace: Structure-Aware 3D Indoor Scene Generation from a Single 360{\deg} Image},
  author    = {Koo, Gwanhyeong and Kim, Hyunsu and Kim, Youngji and Lee, Taejae and
               Lim, Siwoo and Yoon, Sunjae and Yeon, Suyong and Yoo, Chang D.},
  booktitle = {European Conference on Computer Vision (ECCV)},
  year      = {2026}
}
```
-->

## License

Released under the MIT License. This work builds on TRELLIS.2 (MIT, Microsoft). Some dependencies
(e.g. nvdiffrast, nvdiffrec) carry their own licenses.