JT Writer

The JT writer allows developers to export the Assembly, B-rep, View data from Exchange to JT. The file extension associated to JT files is *.JT*.

As of 2019, HOOPS Exchange supports export to JT 10.


The assembly structure including coloring and transformations will be exported to the JT file. The export is currently to a single monolithic file.

Exporting JT with instances is supported. Yet, if instances contain color redefinition, the instance is exported as a copy instead. Instance sub-assemblies are copied.


When we export the B-rep it will always be in Parasolid B-rep. If the format was not a Parasolid-based format then all surfaces get mapped to one of the following:

Curves are mapped to the following:

If the source data was originally XT then HOOPS Exchange will take that data and use it for the B-rep definition.


The tessellation is exported in a lossless, compressed format. Wireframes are not currently exported.


Views are exported upon writing to JT.


All supported PMI is exported to one of the following types.

Export options specific to JT

Export options specific to JT can be found on the A3DRWParamsExportJTData reference page.


The current limitations include: