LLaMA4 Maverick
OmniMech
All-in-one Multimodal Mechanical Benchmark for 3D Reconstruction
251Kpaired models
28views / model
Tested Upon State-of-the-Art LLMs
Qualititive Results
Hover the input drawing to inspect details. Drag models to orbit and scroll to zoom.
Add input drawing
drawings/case-01.png
drawings/case-01.png
Ground Truth
GPT 5.5
GPT 5.4 Mini
Claude Opus 4.8
Gemini 3.1 Pro
Gemini 3.5 Flash
Qwen 3.7 Plus
Qwen 3.5 9B
InstantMesh
SAM 3D
TRELLIS
Cad Coder
The benchmark
Industrial geometry deserves industrial precision.
General-purpose 3D benchmarks reward visual plausibility. Mechanical engineering demands something stricter: exact dimensions, valid topology, manufacturable features, and programs that remain editable.
Every OmniMech sample starts from a native SolidWorks part and its orthographic drawing, then expands into a rich multimodal record for training and evaluation.
Engineering Drawing2D CAD
GeometricSTEP B-Rep + OBJ
Visual28 renders + video
SemanticDimensions + feature graph
Four evaluation tracks
A benchmark for the complete reconstruction loop.
From reading a drawing to verifying a manufactured form, OmniMech evaluates the capabilities that must work together.
Parametric CAD program synthesis
Generate executable programs that construct valid, editable 3D objects directly from mechanical drawings.
Diagram-to-3D reasoning
Recover geometry, topology, occluded structure, and cross-view consistency from orthographic evidence.
Annotation-grounded reasoning
Interpret dimensions, symbols, and feature callouts, then enforce them as geometric constraints.
Tool-augmented reconstruction
Use visualization, measurement, CAD execution, and verification tools to iteratively refine a model.
Dataset statistics
Today's models see the shape. They miss the design intent.
OmniMech spans diverse mechanical applications, part types, geometric complexity, and richly annotated engineering drawings.
Authors & institutions
OmniMech: All-in-one Multimodal Mechanical Benchmark for 3D Reconstruction
Pennsylvania State UniversityShanghai Jiao Tong UniversityBinghamton UniversityMicrosoft Research
Citation
BibTex
@article{lu2026omnimechallinonemultimodalmechanical,
title={OmniMech: All-in-one Multimodal Mechanical Benchmark for 3D Reconstruction},
author={Taiting Lu and Runze Liu and Ziwei Dong and Sisong Bei and Jingying Zeng and Mingjia Wang and Zhenghao Li and Kaiyuan Lin and Yi-Shan Wu and Yangshoudu Zheng and Hongxing Pan and Kai Zhang and Guoliang Shi and Ling Ma and Yifan Yang and Jiaying Lu and Qi He and Sung-Liang Chen and Yi-Chao Chen and Yincheng Jin and Mahanth Gowda},
year={2026},
eprint={2608.05539},
archivePrefix={arXiv},
primaryClass={cs.CV},
url={https://arxiv.org/abs/2608.05539},
}