# 3D upload and automatic processing

Between the scanner and a model you can study lies a chain of technical work: format conversions, texture handling, optimization for the screen. In the Hub that chain runs by itself. Your part ends when the capture is delivered.

## How a model reaches the Hub

- **From the Scan app.** Finished scan sessions are delivered directly by the [AerariumChain Scan app](/en/scan-app/); the Hub registers each delivery and begins work.
- **From the browser.** In **3D Assets**, the upload dialog accepts files by drag and drop: useful for models produced elsewhere or received on loan of data.

Accepted model formats: **OBJ, PLY, STL, GLB, OFF**, with **MTL** materials and **JPG, PNG, BMP** textures. Transfers go to protected cloud storage; large models travel in parallel parts, so even heavy scans arrive briskly.

## What the Hub does on its own

As soon as a delivery is registered, the [worker network](/en/node-workers/) takes over:

- **Conversion** of any accepted format into the form the viewer streams best, and back into working formats when needed.
- **Textures** preserved, compressed, and re-prepared where necessary, so the color captured on the easel survives intact.
- **Levels of detail.** Several graded versions of each model are prepared, with textures scaled to match, so the [viewer](/en/3d-viewer/) can serve a phone in the gallery and a workstation in the study room with equal grace.
- **Plates and previews.** Turntable views, in full color and in neutral relief, illustrate each model in the listing.
- **Scan processing.** Raw scanner sessions are resolved into finished meshes on workers equipped with the Artec software.

## Following the work

Each item in **3D Assets** shows its versions and the steps behind them, each marked completed, failed or cancelled. When the last step closes, **View 3D** opens the [viewer](/en/3d-viewer/).

Preservation derivatives produced by **DPAC** (Ecomic) appear here as well. While a DPAC package that cites a derivative is being deposited, or once it has been notarized, that derivative is locked against deletion: the preservation record stays whole.

## Bound to the Catalog

Every delivery is tied to the record of the work it digitizes. From the [Catalog](/en/catalog/) you reach the models of a work; from a model you always know which work it belongs to, and under whose custody it stands.