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Formate CAD Native

Native CAD Formats refers to formats that are proprietary to specific CAD systems. If you have the ability to read these formats, they will have the most information and be more accurate than Geometric Modeling Kernel formats or Neutral CAD formats.

For this reason it’s always a good idea to ask your customer for the native format (assuming you have the capability to read the the native format).

Format	Extensions	Precise or Tessellated	Vendor	TransMagic Read	TransMagic Write	Notes
AutoCAD	.dwg, .dxf	Both	Autodesk	R9-2017	R9-2017	DXF is ASCII
CATIA V4	.model	Precise	Dassault	4.1.9 – 4.2.4	4.1.9 – 4.2.4
CATIA V5, V6	CATPart, CATProduct, CGR	Both	Dassault	15-2018 (R28)	15-2018 (R28)	File-based support for V6. Note that CGR is Visrep.
Creo	.prt, .asm	Precise	PTC	Up to 3.0
Microstation	.dgn	Precise	Bentley Systems	Up to V7
NX, Unigraphics	.prt, .jt, .j_t	Precise	Siemens	NX up to NX11, JT up to 10.2	JT up to 10.2	JT is a compressed visualization format ideal for viewing large assemblies.
Pro/E	.prt, .asm	Precise	PTC	Up to Wildfire 3
Inventor	ipt, iam	Both	Autodesk	Up to 2018
SOLIDWORKS	.sldprt, .sldasm	Both	Dassault	97-2018	97-2017	Writing SOLIDWORKS format requires that the version of SOLIDWORKS you want to write to is actively licensed on the same machine.
Solid Edge	.par, .asm, .psm	Both	Siemens	ST9		Best exported as X_T.

Geometric Modeling Kernels

Geometric Modeling Kernels are what Native CAD formats are built upon. Because these formats are strictly managed by the vendors, they are a better source of geometric information than STEP or IGES.

Format	Extensions	Precise or Tessellated	Vendor	TransMagic Read	TransMagic Write	Notes
ACIS	.sat, .asat, .sab, .asab	Both	Spatial Technologies	R1.5-R2017 (R27)	R1.5-R2017 (R27)	SAT is ascii, .sab is binary, and .asat and asab are specifically for assemblies. ACIS supports Non-Manifold geometry.
Parasolid	.x_t	Precise	Siemens	Up to 29.0	Up to 29.0	Parasolid supports only manifold geometry. Read more about Manifold and Non-Manifold here.
SMLib	.sms, .iwb, .iwp	Precise	Solid Modeling Solutions	All Versions	All Versions

Neutral CAD Formats

Neutral CAD formats are the lowest-common denominator between CAD systems. If your customer does not have the software to read the native CAD file or the geometric modeling kernel format, STEP is your best bet.

Format	Extensions	Type	Managing Entity	TransMagic Read	TransMagic Write	Notes
IGES	.sat, .asat, .sab, .asab	Precise	ANSI / ASME	Up to 5.3	Up to 5.3	International Graphics Exchange Format; this format primarily supports surfaces and is generally the weakest of the translation formats.
STEP	.stp, .step	Both	ISO	AP203/AP214, AP242	AP203/AP214, AP242	STEP is the most popular neutral CAD format in the world today, but STEP is not always the best go-to format for translation.

Tessellated Formats

CAD formats are often converted to polygonal formats such as STL and OBJ for the purposes of 3D printing, animation or game development. Polygonal formats are tessellated, or faceted, and as such are an approximation, containing none of the engineering information found in Brep CAD models, such as weight or volume. Note that we have also included NGRAIN’s voxels in this list since, like polygons, voxels are an approximation of CAD geometry.

Format	Extensions	Precise or Tessellated	Vendor / Managing Entity	TransMagic Read	TransMagic Write	Notes
3DXML	.3dxml	Tesselated	Dassault	Up To R2016 (v4.3 internal version)	Up To R2016 (v4.3 internal version)
3D PDF	.pdf	Tesselated	Tetra 4D	Up to 1.7	Up to 1.7	3D PDF is an ideal format for sharing information with people who don’t have a CAD system or a CAD viewer; all you need to view a 3D PDF file is Adobe Acrobat Reader, which almost everyone has.
OBJ	.obj	Tesselated	Wavefront	All Versions	All Versions	Obj is a format commonly used for exchanging information between modeling and animation systems such as 3ds Max and Maya.
Collada	.dae	Tesselated	ISO	All Versions	All Versions
NGRAIN	.3ko	Voxel	Ngrain		Up to version 4.1	Voxels are actually a type of 3D pixel; they don’t really fit into any of the standard categories well, so we put them here. Voxels are good for allowing technicians and mechanics to visualize, maintain and service large, complex 3D assemblies such as automobiles and aircraft.
PLY	.ply	Tessellated	Stanford University	All Versions	All Versions
POD	.pod	Tessellated		All Versions	All Versions
Stereo Lithography	.stl	Tessellated	3D Systems	All Versions	All Versions	STL is the default format for 3D printing. STL files can be optimized using export settings, or via the Polygon Reduction tool.
VRML	.wrl	Tesselated	WWW3	1.0 & 2.0
WebGL	.html	Tesselated	WWW3		1.0 & 2.0	WebGL files are viewable and rotatable in any HTML5-supported browser with no plugins necessary, making them ideal for online parts libraries.