ISO/PWI 14306-4

Industrial automation systems and integration — JT file format specification for 3D visualization — Part 4: JT 10.5

Scope

The JT file format specification for 3D visualization specifies the sequential order of bytes that comprise the segments of data required to represent a JT file. The JT format is uniquely compressed to minimize file size.
The JT file format specification for 3D visualization includes data descriptions that can represent the following data in binary format.
— facet information (triangles), stored with geometry compression techniques;
— visual attributes such as lights, textures and materials;
— product manufacturing information (PMI);
— boundary representation (b-rep) solid model shape representation based on ISO 10303 and associated metadata;
— boundary representation (b-rep) solid model shape representation XT b-rep and associated metadata;
— lightweight ULP geometric boundary representation;
— lightweight LWPA precise analytic geometric boundary representation;
— Smart Topology Table, a data structure that supports bi-directional mapping between polygonal mesh (LODs) and B-Rep faces;
— configuration representations; and
— delivery methods such as asynchronous streaming of content.

A complete list of Product Manufacturing Information (PMI) String Property Atom Element values will be made available as a Reference Data Library in electronic insert format. A number of Material and Surface attributes referenced by the ISO 14306-4 specification will also be defined in a separate Reference Data Library in electronic insert format.

To enable the support for JT file format 9.5 to continue the existing specification ISO 14306:2017 Edition2 will be retained. Therefore, this NWIP will deliver a new part for ISO 14306 with the label ISO 14306-4

Both the ISO 10303 B-Rep and XT B-Rep geometry representations will be defined as Normative
The JT file format specification for 3D visualization does not specify the implementation of, or definition of, any runtime architecture for viewing and/or processing JT data.