JT Writer

Supported Entities

Entities supported by the JT writer.
  • Point
  • Line
  • Surface
  • Solid
  • Part
  • Assembly
  • Elements are exported as tessellations as follows:
    • tria3 elements
    • quad4 elements, each split into two triangles
    • tetra4 element faces
    • penta6 element faces, with each quad face split into two triangles
    • hex8 element faces, with each face split into two triangles

Export Options

The JT export option is extensively used inside CAD modeling and PLM systems to quickly visualize a products structure and to compare changes between revisions of CAD and FE models. Select the JT export option to export all of the model's geometry and FE element information, component organization, and property color.

The JT writer uses the jt_writer.ini file with the following available options:

@AllowDisjointShells
Value Description
on Store non-manifold geometry in one disjoint feature.
off Split and store non-manifold geometries as separate joint shell features (default).
@AssemblyMode
Value Description
Parts Create part entity hierarchy as assembly and part entity in JT.
Assemblies Create assembly and component entity as assembly and part entity in JT.
Flatten Write entities in all components into a single JT Part.

n

@AttributeForMaterialName
Value Description
string Attribute created with the name contains PDM metadata-material name information associated with the part entity.

Meaningful only if AssemblyMode = "Parts".

Default is "Material".
@AttributeForMeshFlag
Value Description
string Attribute created with the name contains PDM metadata-mesh flag information associated with the part entity.

Meaningful only if AssemblyMode = "Parts".

Default is "MeshFlag".
@AttributeForMID
Value Description
string Attribute created with the name contains PDM metadata-material ID information associated with the part entity.

Meaningful only if AssemblyMode = "Parts".

Default is "MaterialId".
@AttributeForPartNumber
Value Description
string Attribute created with the name contains PDM metadata-part number information associated with the part entity.

Meaningful only if AssemblyMode = "Parts".

Default is "PartNumber".
@AttributeForPID
Value Description
string Attribute created with the name contains PDM metadata-property ID information associated with the part entity.

Meaningful only if AssemblyMode = "Parts".

Default is "PID".
@AttributeForRevision
Value Description
string Attribute created with the name contains PDM metadata-revision information associated with the part entity.

Meaningful only if AssemblyMode = "Parts".

Default is "Revision".
@AttributeForThickness
Value Description
string Attribute created with the name contains PDM metadata-thickness information associated with the part entity.

Meaningful only if AssemblyMode = "Parts".

Default is "Thickness".
@AttributeForUID
Value Description
string Attribute created with the name contains the PDM metadata-UID information associated with the part entity.

Meaningful only if AssemblyMode = "Parts".

Default is "UID".
@CreateTessellation
Value Description
on Create tessellations even when no mesh is exported (default).
off Create just the tessellations corresponding to the exported mesh.
@Export
Value Description
all Export all geometry (default).
displayed Export displayed geometry only.
@FileMode
Value Description
Monolithic Create a single JT file.
PerPart

Create a JT file “Per part”.

For example, there is a JT file containing the main assembly and each part is stored in an individual JT file in a subdirectory with the same name as the main JT file (default).
@GeometryMode
Value Description
Standard Write CAD geometry with standard types such as cylinder, cone, circle, and so on (default).
BSpline Convert all surface geometry data into NURBS. This option may increase the output file size and be time consuming depending on the actual geometry.
@MetadataPrefixFilter
Value Description
string Prefix to use to find metadata to export. Only metadata with the specified prefix is exported. Any metadata without this prefix is not exported. Default is empty, meaning all metadata will be exported.
@NameFromRepresentation
Value Description
on Assign part name in CAD file from the representation file name attached to part entity.

Meaningful only if AssemblyMode = "Parts".
off Assign part name in CAD file from the part entity name in HyperMesh.

Meaningful only if AssemblyMode = "Parts".
@OptimizeForCAD
Value Description
on Fix gaps between stitched edges and vertices to make the actual geometry of the surfaces consistent with the model topology before export, and check the topology of the model for gaps that are larger than a given tolerance between shared, non-manifold, or suppressed edges. If the gap is found to be bigger than the tolerance, the surface and edge geometries are morphed parametrically and in 3D, if necessary, to make the gap smaller than the tolerance. In addition, non-essential degenerate edges are removed. This also modifies the geometry within HyperMesh (default).
off Do not perform the optimization steps.
@RemoveMetadataPrefix
Value Description
on Remove the metadata prefix for export.

Meaningful only if @MetadataPrefixFilter is enabled and non-empty.
off Do not remove the metadata prefix for export (default).

Meaningful only if @MetadataPrefixFilter is enabled and non-empty.
@SourceUnits
Value Description
  • MKS (m kg N s)
  • MMKS (mm kg N s)
  • MPA (mm t N s)
  • CGS (cm g dyn s)
  • MMKNMS (mm kg kN ms)
  • MMGNMS (mm g N ms)
  • IPS Std (in pounds lbf s)
  • IPS Grav (in slinch lbf s)
  • FPS Std (ft pounds lbf s)
  • FPS Grav (ft slug lbf s)
 Unit system assigned to the data present in HyperMesh during export
@TargetUnits
Value Description
  • Microns
  • Millimeters
  • Centimeters
  • Decimeters
  • Meters
  • Kilometers
  • Mils
  • Inches
  • Feet
  • Yards
  • Miles
 Units System in the exported JT file.
@TopologyMode
Value Description
Solid/Shell Export topology data similar to HyperMesh topology data, keeping the distinction between solids and shells (default).
Surface Export each surface, including solid faces, as a single surface, effectively neglecting connectivity.
@Version
Value Description
string The JT version to use for export. Valid versions are 10.2 (default), 10.1, 10.0, 9.5, 9.4, 9.3, 9.2, 9.1, 9.0, 8.1, 8.1, 8.0, 7.0 or 6.4.
@WriteColorFrom
Value Description
string Specify colors for the geometrical entities during export. Colors are supported at the component level only, whereas individual entity colors (points, lines, surfaces, solids) are not supported.

Valid values are Component (default) and Metadata.
@WriteMetaDataAsColor
Value Description
string Speciify the metadata to use for coloring entities.

Default is COLOR_RGB.

Meaningful only if @WriteColorFrom = "Metadata".
@WriteMetaDataAsName
Value Description
string Specify the metadata to use for naming entities.

Default is TAG.

Meaningful only if @WriteNameFrom = "Metadata".
@WriteNameFrom
Value Description
string Specify names for the geometrical entities during export. Names are supported at the component level only, whereas individual entity names (points, lines, surfaces, solids) are not supported.

Valid values are Component and Metadata (default).