MechAtlas is a benchmark containing 49,687 paired samples of 2D mechanical engineering drawings and corresponding 3D CAD models from real-world industrial production.

Each sample consists of:

A PDF drawing representing the 2D engineering documentation.
A STEP model representing the corresponding 3D CAD geometry.

The dataset supports research on engineering drawing understanding, drawing-to-CAD reconstruction, and correspondence between 2D drawings and 3D geometry.

Dataset Statistics

Item	Count
Paired samples	49,687
PDF drawings	49,687
STEP models	49,687
Total data files	99,374

Each PDF–STEP pair counts as one sample. The total file count excludes repository documentation and other administrative files.

Data Source and Creation

The engineering drawings and CAD models were manually created by professional engineers.

The original engineering drawings underwent rigorous technical review and formal approval, including signatures and stamps, and were ultimately used in real-world industrial production.

Dataset Structure

File Formats

Component	Extension	Description
Engineering drawing	`.pdf`	2D mechanical engineering documentation
CAD model	`.step`	Corresponding 3D CAD geometry in STEP format

Directory Organization

The underlying data is organized into two top-level directories, with numbered subdirectories grouping the files:

MechAtlas/
├── PDF/
│   ├── 0000/
│   │   └── 00001495.pdf
│   ├── 0001/
│   ├── 0002/
│   ├── 0003/
│   └── 0004/
└── STEP/
    ├── 0000/
    │   └── 00001495.step
    ├── 0001/
    ├── 0002/
    ├── 0003/
    └── 0004/

The tree above illustrates the directory layout and one example pair.

Sample Identification and Pairing

The filename without its extension serves as the sample identifier. A PDF drawing and a STEP model with the same identifier form a pair.

For example:

Sample ID	PDF drawing	STEP model
`00001495`	`PDF/0000/00001495.pdf`	`STEP/0000/00001495.step`

All 49,687 sample identifiers have both a PDF drawing and a STEP model in the prepared data package.

Treat sample identifiers as strings and preserve their leading zeros when extracting, indexing, or processing the files.

Access and Usage

Requesting Access

MechAtlas is distributed as a gated dataset with manual approval.

To request access:

Sign in to your Hugging Face account.
Provide your affiliation and research purpose in the access request form.
Submit your request for review.
After approval, download the data from the Files and versions tab.

Working with the Files

Open PDF drawings with a PDF viewer and import STEP models using CAD software or a geometry-processing library that supports STEP.

When working with archive downloads, extract the files before use and preserve the original sample identifiers.

Match each drawing to its corresponding CAD model using the shared filename identifier.

License

MechAtlas is distributed under the Creative Commons Attribution 4.0 International License (CC BY 4.0).

Use and redistribution must comply with the license terms. The access request process governs downloads from this repository; the license governs use and redistribution of the data.

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