IGES
IGES (Initial Graphics Exchange Specification) is a legacy standard for 2D/3D CAD data exchange. While largely superseded by STEP, IGES remains in use for compatibility with older CAD systems. LinkCAD exports 2D layout data as extruded 3D geometry in IGES format.
Format Summary
| Property | Value |
|---|---|
| Extensions | .igs, .iges |
| Encoding | ASCII |
| Import | — |
| Export | ✓ |
| License | 3D Modeler |
Export Options
| Option | Description | Default |
|---|---|---|
| Arc precision | Segments per 360° for curve approximation | 72 |
| Units | Output coordinate units | Micron |
How It Works
LinkCAD takes each 2D polygon in the layout and extrudes it along the Z-axis, producing 3D solid geometry in IGES format. The resulting file can be opened in any legacy MCAD application supporting IGES.
Common Workflows
GDSII → IGES
Export IC mask layout to IGES for use in legacy mechanical CAD systems.
DXF → IGES
Convert 2D AutoCAD drawings to IGES for older CAD tools.
Technical Notes
- IGES is export-only in LinkCAD
- IGES is a fixed-format ASCII file with 80-character lines
- The 3D Modeler license bundle is required
- Output supports wireframe and surface geometry entities
CLI / Command-File Options
These option keys can be used on the command line or in command files.
Export
| Key | Type | Description |
|---|---|---|
IgesOutUnits | int | Output coordinate units |