ZackaryJing/dm-cad.lmdb

Multimodal CAD Dataset

A comprehensive multimodal dataset for CAD (Computer-Aided Design) understanding and generation tasks.

Description

This dataset contains multiple modalities of CAD data, designed for research in CAD understanding, generation, and multi-modal learning. Each CAD model is represented in several complementary formats.

Data Modalities

Modality	Directory	Format	Description
Description	cad_desc/	JSON	Natural language descriptions of CAD models
Image	cad_img/	PNG	Multi-view renderings (8 views per model)
Point Cloud	cad_ply/	PLY	3D point cloud representations
STEP	cad_step/	STEP	Original CAD parametric format
Vector	cad_vec/	TXT	Vector representations of CAD commands
JSON	cad_json/	JSON	Structured CAD parameter data

Data Organization

• cad_img/{category}/{model_id}/{view}.png - Images organized by category and model ID
• cad_vec/{category}/{model_id}/{file}.txt - Vector files organized similarly
• cad_desc/{id}.json - Description files with numeric IDs
• cad_ply/{category}/{model_id}.ply - Point cloud files
• cad_step/{category}/{model_id}.step - STEP files
• cad_json/{category}/{model_id}.json - JSON parameter files

Data Splits

The dataset is divided into train/validation/test splits. The ID lists are provided in:

• train_ids.txt - Training set IDs (models that have all modalities)
• valid_ids.txt - Validation set IDs
• test_ids.txt - Test set IDs

These IDs represent the intersection of models that have all three core modalities:

• cad_vec (vector commands)
• cad_img (rendered images)
• cad_desc (descriptions)

Statistics

See partition_stats.json for detailed statistics including:

• Total counts per modality
• Train/valid/test split sizes
• Missing data counts per modality

Usage

This dataset is intended for research purposes, including but not limited to:

• CAD generation from text descriptions
• Multi-view CAD understanding
• Cross-modal retrieval (text-to-CAD, image-to-CAD)
• CAD representation learning

License

This dataset is provided for research purposes.

Citation

If you use this dataset in your research, please cite our work (citation to be added).

Contact

For questions or issues, please open an issue on the repository.