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How to convert Autodesk Inventor (.iam,.ipt) to 3KO (NGRAIN .3ko)?

PolyTrans|CAD+DCC performs mathematically precise CAD, DCC/Animation, GIS and BIM 3D file conversions into all key downstream 3D packages and file formats. Okino software is used and trusted throughout the world by many tens of thousands of 3D professionals in mission & production critical environments, backed by respectable personal support directly from our core development team.


Autodesk Inventor

Autodesk Inventor is Autodesk's main MCAD "BREP solids" modelling software program which has competed with its rivals of SolidWorks, ProE/Creo, Solid Edge, Unigraphics NX (and partly) CATIA v4/v5 since its original release in 1999.

The file formats of key importance would be ".ipt" which contains the geometry of each part/object in the scene, and, ".iam" files which contain the scene assembly information.

Conversion from Autodesk Inventor into Okino software is handled by these 3 ideal methods:

  • Via DWF-3D files exported from Inventor. This is the most ideal and "least mentally taxing" conversion method. It also supports material and texture map conversion.
  • Via native import of the .iam or .ipt files,
  • Via STEP AP214 or IGES 'BREP solids' files.



'3KO' is a 3D voxel/mesh visualization file format designed by NGRAIN Corporation of Canada (previously known as i3Dimensions). It was used with their interactive 3D training solutions for the aerospace, defense, and manufacturing sectors. It is generally a "one way" format from such software packages as 3ds Max and Maya into the NGRAIN software.

Going back in time to the 2003 era, Okino and NGRAIN collaborated on the development of the NGRAIN 3KO exporter within Okino software.