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, and any pictures a 3MF package carries - its own thumbnail, the build-plate renders slicers such as Bambu Studio and OrcaSlicer write, and texture maps - are extracted and shown with it. 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.