STEP: editable B-Rep
Solid geometry for direct modeling, CAM and simulation in compatible CAD tools. STEP does not carry the original construction history.
Reverse Engineering
From 2D drawing to editable STEP – without redrawing it
Give design engineers a head start: reconstruct the part, inspect its dimensions and move into your CAD system with editable geometry.
Source evidence · inspectable results · engineering options
3D Spark is trusted by
Spend engineering time on design, not redrawing archives
Today
PDFs and paper archives hold engineering knowledge, but leave your team rebuilding geometry before design, CAM or simulation can begin.
With Voluminate
Recover a CAD starting point and concentrate on the features that need your engineering judgment.
Who it’s for
Teams
- Design engineers
- Engineering services
- CAD / CAM teams
Industries
- Machinery
- Automotive suppliers
- Industrial equipment
Processes
- CNC milling
- CNC turning
- Casting
- Additive manufacturing
The workflow
From source evidence to your next decision
- 01
Upload the drawing
Bring a PDF, scan or supported drawing. The existing pre-check confirms the source before reconstruction.
- 02
Generate CAD candidates
AI CAD reconstructs editable geometry from drawing views and dimensions.
- 03
Review the result
Compare dimensions in the browser and inspect drawing-defined, inferred and unresolved features.
- 04
Continue in your CAD system
Use STEP for direct modeling, eligible native Onshape candidates, or Engineer Built for a full parametric rebuild.
What you get
Native Onshape: Early Access
Eligible AI CAD parts can include an AI-built Onshape feature tree. Continue with sketches and features in your connected Onshape workspace.
Engineer Built: full parametric CAD
An engineer rebuilds the part with a complete feature tree and agreed dimensional requirements in the scoped native CAD format.
Source & deliverable evidence
See what a native feature tree looks like
This mechanical bracket example shows a reconstructed part in Onshape with its feature tree. For STEP workflows, the deliverable is editable B-Rep geometry; native history is a separate option.
Your numbers, your business case
Put your drawing backlog into numbers
Compare current modeling time with AI CAD and review effort using your own part volume and hourly rate.
Questions about reverse engineering
Can I turn PDF, DWG or scanned drawings into STEP?
Yes, supported drawings can enter the reconstruction workflow. Upload DWG or DXF alone; use PDFs and scans with legible dimensions and views of the same part. The pre-check confirms eligibility.
Is STEP really editable?
Yes. STEP B-Rep solids can be edited with direct-modeling tools in compatible CAD systems. They do not include the original sketches or feature history.
When do I get an Onshape feature tree?
Eligible parts can receive an AI-built native Onshape candidate through the Early Access integration. Feature coverage depends on the source and geometry; broader Onshape App Store distribution is in progress.
What does Engineer Built add?
Engineer Built is a scoped engineering rebuild with a complete parametric feature tree and agreed dimensional requirements. Specify your native CAD format and design intent when requesting the service.
Can I use the result for CNC, casting or AM?
The reconstructed geometry can support CAM, simulation and process planning. Your team checks the dimensions, tolerances and process requirements before releasing it for manufacturing.
How do I check the reconstruction?
Use the annotated source, quality findings and browser measurement tools to compare the candidate against the drawing. Engineer Checked is available for an engineering review of the agreed scope.