JT (visualization format)

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It is probably the most widely used 3D visualization format for discrete manufacturing with over 4,000,000 JT-enabled licenses of software in use.Contents1 Overview 2 History 3 Large Model Rendering 4 Data Model 5 File Structure 6 Compression 7 JT Open 8 JT Open Toolkit 9 JT2Go 10 External links // OverviewJT files are used in product lifecycle management (PLM) software programs such as Teamcenter (/ Lifecycle Visualization) by engineers and other professionals that need to analyze the geometry of complex products. The format and associated software is structured so that extremely large numbers of components can be quickly loaded, shaded and manipulated in real-time. Because all major 3D CAD formats are supported, a JT assembly can contain a mixture of any combination which has led to the term "multi-CAD". As JT is typically implemented as an integral part of a PLM solution, the resulting multi-CAD assembly is managed such that changes to the original CAD product definition files can be automatically synchronized with their associated JT files resulting in a multi-CAD assembly that is always up-to-date.Because JT files are inherently "lightweight" (~1-10% of the size of a CAD file) they are ideal for internet collaboration. With the growing trend toward globalization, more companies are leveraging resources wherever they are available in the world. Collaboration using JT allows companies to send 3D visualization data to suppliers and partners much more easily than sending the associated "heavy" CAD files. In addition, real-time, on-line collaboration is easier because the amount of information sent back-and-forth across the internet is reduced. Finally, JT provides an inherent security feature such that intellectual property does not have to be shared with inappropriate parties. As indicated above, JT can contain any combination of data such that the right amount of information can be shared without exposing the underlying proprietary design definition information.JT is often used for Digital mockup (DMU) work, which allows engineers to validate that a product can be assembled together without interferences long before a physical prototype could be produced. This "spatial validation" is enabled by precise measurements and cross-sectioning as well as sophisticated clearance/interference detection. Leveraging JT for digital mockup allows users to reduce or eliminate costly physical prototypes and enables decision-making to occur much earlier in the development process.Finally, JT is used as a CAD interoperability format for exchanging design data for Collaborative Product Development, where JT files are created by translating data from CAD systems such as NX (Unigraphics), I-DEAS, Solid Edge, Catia, Pro/Engineer, or Autodesk Inventor. JT is supported by an open industry forum, the JT Open Program, that is an open, influential community of users, software vendors, and interested parties advocating the use of JT as the visualization, collaboration and data-sharing standard for the PLM industry. The JT Open members have even advocated JT as suitable for use as a long-term data archival format.HistoryJT was originally developed by Engineering Animation, Inc. as the DirectModel toolkit. When EAI was purchased by UGS, JT became a part of UGS Corp. suite of products. Early in 2007 UGS announced the publication of the JT data formateasing the adoption of JT as a master 3D format. Also in 2007, UGS was acquired by Siemens A.G. and became Siemens PLM Software. JT is the common interoperability format in use across all of Siemens PLM Software and has been adopted as the long term data archival format across all of Siemens.Large Model RenderingJT was created to support the interactive display of very large assemblies (i.e. those containing tens of thousands of components). The JT file format is capable of storing an arbitrary number of faceted representations with varying levels of detail (LODs). When the whole product is displayed on the computer screen the hosting application displays only a simple, coarse, model. However, as the user zooms into a particular area, progressively finer representations are loaded and displayed. Over time, unused representations are unloaded to save memory.Data ModelThe JT data model is capable of representing a wide range of engineering data. This data can be very lightweight,...(and so on)


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