What is a .IGS file?
IGS is the same older CAD exchange format as IGES, for 3D models and surfaces.
- Did you know
- IGS is IGES under its short extension - the first widely used CAD exchange format, from 1980.
- The format stores geometry as plain readable ASCII text divided into rigid 80-column record sections.
- It can describe wireframe curves, trimmed surfaces and annotations, which is why it long outlived its 1980s origins.
- Modern CAD has largely shifted to the newer STEP standard, but IGS remains common for legacy surface data.
- What Analyser shows you
- View STL, OBJ, PLY, OFF, STEP, IGES, BREP, 3MF, AMF and glTF/GLB models in an interactive WebGL viewer with orbit, orthographic or perspective projection, a wireframe topology overlay, an orientation cube, triangle count, bounding box, surface area and volume. glTF 2.0 and binary GLB scenes are parsed natively - the node graph is flattened, mesh geometry shown, and the authoring tool, version and mesh/material/animation counts read. STEP/IGES/BREP are tessellated with OpenCASCADE and STEP shows its originating CAD system, version and AP203/214/242 protocol; 3MF and AMF let you inspect each model and assembly on the build plate individually. Wavefront material libraries (MTL) are broken out into each material with its colours, shininess, opacity and the texture files it references.
- Open a .IGS file
- Drag a .IGS file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.