JT exchange

JT is an open data format to view and share 3D product information. JT was originally developed by Engineering Animation, Inc. and Hewlett Packard as the DirectModel toolkit (initially Jupiter). After several acquisitions, JT became a part of UGS Corp.'s suite of products. Early in 2007 UGS announced the publication of the JT data format as a master 3D format. Also in 2007, UGS was acquired by Siemens AG and became Siemens PLM Software, JT is now the common interoperability format and has been adopted as the long term data archival format across all of Siemens. On 2009 September 18 the ISO stated officially that the JT specification has been accepted for publication as an ISO Publicly Available Specification (PAS). On 2012 December, JT has been officially published as ISO 14306:2012. JT Open is a community of users, software vendors and OEMs. ITI Transcendata is a JT Open membership for CADfix.

JT Open is a community of users, software vendors and OEMs. ITI Transcendata is a JT Open membership for CADfix. Each participant creates the CAD model and translates it into JT to ensure that it is syntactically, structurally, and semantically, correct.

CADfix capabilities regarding JT support with last in production release are available on the following video

Product structure may be represented in a variety of JT file configurations:

  • Monolithic: All product structure is stored in a single JT file.
  • Per part: All assembly nodes in a product structure hierarchy are stored in a single JT file, and each part node in the hierarchy is stored in an individual JT file in a subdirectory with the same name as the assembly JT file.
  • Fully shattered: Each product structure node in the hierarchy is stored in an individual JT file.
  • MIMIC : Each assembly node is stored as an individual JT file and each part node in the hierarchy is stored in an individual JT file in a subdirectory with the same name as the assembly JT file.
  • PLMXML: An open XML based file format. A PLMXML structure could link to the model data in another file (an External Representation), or the data can be embedded within the Representation element in the XML file (an Internal Representation).

JT format supports lightweight geometry representation or complete NURBS geometry representations in addition to product structure, attributes, meta data and PMI. It also supports compression and multiple tessellations with level-of-detail (LOD) generation:

  • Product Structure: assembly, part, instance
  • Facet: polygon, polygon set
  • Lighting: light set, point light, infinite light
  • Textures
  • Precise Geometry and Topology: point, curve, surface, face, loop, edge, vertex
  • Boundary representation (B-rep): JT B-rep or XT B-rep (Parasolid) format.
  • Geometry Primitives: box, cylinder, pyramid, sphere
  • Product Manufacturing Information (PMI): GD&T, 3D annotations
  • Attributes / Properties: text, integer, float, date, layers
  • Meta data: property filters, transforms, bounding box definitions

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