---
license: other
license_name: mixed-cc0-mit
license_link: https://huggingface.co/datasets/gerchowl/mat-vis/blob/main/LICENSES/README.md
pretty_name: mat-vis — PBR material catalog
task_categories:
  - image-to-image
  - image-classification
tags:
  - pbr
  - materials
  - textures
  - graphics
  - 3d
  - rendering
  - mtlx
  - materialx
size_categories:
  - 1K<n<10K
---

# mat-vis — PBR material catalog

Open, browseable catalog of physically-based rendering (PBR) materials
aggregated from four upstream sources. Served as atomic, immutable
tagged revisions with tar containers + JSON sidecar offset maps for
channel-level HTTP range reads.

- **Canonical client:** [`mat-vis-client`](https://pypi.org/project/mat-vis-client/) (PyPI) — pins a single dataset revision per release.
- **Source repo / baker:** [github.com/MorePET/mat-vis](https://github.com/MorePET/mat-vis)
- **Schema source-of-truth:** [`docs/specs/index-schema.json`](https://github.com/MorePET/mat-vis/blob/main/docs/specs/index-schema.json)
- **Architecture:** [ADR-0007 — Substrate move to HF Datasets + tar container](https://github.com/MorePET/mat-vis/blob/main/docs/decisions/0007-substrate-move-to-hf-datasets-and-tar-container.md)

## Sources and licenses

| Source | Upstream | License | Attribution |
|---|---|---|---|
| ambientcg | <https://ambientcg.com> | CC0-1.0 | Public-domain dedication |
| polyhaven | <https://polyhaven.com> | CC0-1.0 | Public-domain dedication |
| physicallybased | <https://physicallybased.info> | CC0-1.0 | Public-domain dedication |
| gpuopen | <https://matlib.gpuopen.com> | MIT | © 2022 Advanced Micro Devices, Inc. — see [`LICENSES/AMD-NOTICE.txt`](LICENSES/AMD-NOTICE.txt) |

Full license texts live in [`LICENSES/`](LICENSES/README.md). When
redistributing gpuopen-derived material data, preserve the AMD
attribution.

## Layout per tagged revision

```
v2026.05.0/
  release-manifest.json           # {tier: {source: {tar_url, rowmap_url, materials_count}}}
  ambientcg.json                  # per-source catalog: id, category, scalars, source_url
  polyhaven.json
  gpuopen.json
  physicallybased.json
  ambientcg-1k.tar                # one tar per (source, tier)
  ambientcg-1k-rowmap.json        # {material_id: {channel: {offset, length}}}
  polyhaven-1k.tar + polyhaven-1k-rowmap.json
  …
  ktx2/<source>-<tier>.tar + ktx2/<source>-<tier>-rowmap.json
  <source>-mtlx.json              # MaterialX graph index (gpuopen, polyhaven, ambientcg)
```

Every revision is an atomic Hugging Face commit — manifest + tars +
rowmaps + index land together or not at all.

## Accessing data

### Python client (recommended)

```bash
uv add mat-vis-client
```

```python
from mat_vis_client import Client

client = Client()              # pins a revision compatible with this client version
png_bytes = client.fetch("ambientcg", "Bricks080", channel="diffuse", tier="1k")
```

### Direct HTTP range reads

```
base = https://huggingface.co/datasets/gerchowl/mat-vis/resolve/<revision>/
manifest = base + "release-manifest.json"
rowmap   = base + "ambientcg-1k-rowmap.json"
# offset,length from rowmap[<material_id>][<channel>]
# Range: bytes=<offset>-<offset+length-1> against base + "ambientcg-1k.tar"
```

## Versioning

- **Dataset revisions:** calver — `v2026.05.0`, `v2026.06.0`, …
- **Client version:** semver — `mat-vis-client 0.5.x` targets HF substrate; `0.4.x` still works against the frozen `v2026.04.0` GitHub Release.

## Contact

Issues, bugs, and feedback:
<https://github.com/MorePET/mat-vis/issues>