CAD files saved in the Dassault Systems Universal 3D XML format (.3dxml) might be converted to IGES ASCII CAD files (*.igs) using the Export or Save as.. function in CATIA CAD software, or any other dedicated 3D modeling softwafe or converter with the support of .3dxml files. Considering this is a proprietary format, the options for 3dxml to igs conversion will be somewhat limited.
Updated: June 17, 2020
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