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How to convert Parasolid (.x_t,.x_b) to DWG (AutoCAD, DXF)?

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.

Parasolid

Parasolid is a 3D geometric modelling toolkit developed by Siemens PLM's components group in Cambridge, U.K. This toolkit provides hundreds of complex mathematical algorithms and functions which allow software developers to create 3D modelling software based on "BREP solids" modelling techniques (among others). The toolkit uses a "transmit" file format to move data to and from the Parasolid toolkit in native format. The ASCII form uses the .x_t file extension and the binary form uses the .x_b file extension.

Since the late 1990s Parasolid has been used as the core modelling kernel by well known MCAD programs such as Unigraphics NX, SOLIDWORKS, Solid Edge, MicroStation, ANSYS, Delcam and others. Newer versions of the JT file format also include Parasolid functionality by way of the "XT BREP" geometry primitive.

Okino's PolyTrans|CAD provides for a defacto 3D Parasolid file conversion solution used by the world's primary & professional engineering, aerospace, military, corporate, animation/multi-media and VR/AR industries. However, we generally prefer that our core customers utilize either the original native CAD files (such as native SolidWorks files), a STEP AP214 file or an 'IGES BREP solids' file as outlined on our "CAD Data Sourcing Suggestons and Rules" page.

A much deeper overview plus explanation of Parasolid, and how it can be best used + understood, is outlined in this Okino WEB page.

DWG

DXF and DWG are the native file formats of the Autodesk AutoCAD product since 1982. DWG is the binary file variation to the ASCII DXF file format. These files can be viewed by many programs including Autodesk's free DWG TrueView application. It is a closed file format but has been documented by the Open Design Alliance.

At Okino we consider DXF/DWG to be one of the worst 3D file formats when translating 3D model data between applications (depending on its contents). There is very little understanding about this in the 3D graphics world. As outlined in our "CAD Data Sourcing Suggestons and Rules" page you should ideally use the DWF-3D file format when sourcing from either AutoCAD, Navisworks, Revit and optionally Autodesk Inventor.

Due to deep history, Autodesk software can embed ACIS SAT "BREP solids" data in some of its DXF/DWG files. This is the ideal case as the "BREP solids" geometry definitions lead to cleaner and higher fidelity MCAD file conversions. But even so, it would generally be a safer bet to use a STEP AP214 or "IGES BREP solids" file in such cases.

More information about Parasolid

Parasolid import converter's overview

DWG export converter's overview