IOViewer

IOViewer is a fast, 100% managed .NET library and CLI tool for generating standalone interactive 3D WebGL / HTML BIM & CAD model viewers directly from code or file formats (glTF/GLB, Wavefront OBJ, and JSON).

The generated HTML is a single file with no external dependencies that works offline: it opens from disk in a current browser with WebGL 2, without servers, plug-ins or network requests. The viewer is built on three.js, embedded in the file.

Features

  • Compact geometry: shared geometry stored once and placed by transforms; 16-bit quantized positions (error at most 0.49 mm), octahedral normals and 16- or 32-bit indices in one base64 block.
  • Relative-To-Center (RTC) coordinates: no precision jitter on georeferenced models.
  • Large models: geometry merged into spatial chunks per material with few draw calls; hiding, selection and colouring are per-object data, not geometry rebuilds.
  • Navigation: orbit around the point under the cursor, pan with the middle or right button, zoom to the cursor, perspective or orthographic camera, and a view cube that follows the camera.
  • Selection: click, Ctrl+click, window and crossing box selection, context menu, hotkeys (H, I, Shift+H, F, Esc), model tree by category with search and a properties panel.
  • Sections: up to six section planes moved and rotated with an in-scene gizmo, or a section box that keeps or cuts its inside, with face handles and a box around the selection.
  • Tools: point-to-point distance, display modes (materials, textures, white, wireframe), grid lines and global opacity.
  • Coordination data: saved viewpoints and a viewpoint tour, clash results, a 4D schedule player and linked-file visibility.
  • Russian and English interface, chosen from the browser language.

Where to go next

IOViewer is not affiliated with, endorsed by or sponsored by Autodesk. Autodesk, Revit, Navisworks, ViewCube and TimeLiner are trademarks of Autodesk, Inc.

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