About JT files?

Assembly-JT-files-Euro-6 JT files were developed by the PLM.SIEMENS company and originally used for visualization purposes within the Unigraphics CAD system and products related to it.
JT data can be very lightweight, holding little more than facet data and can hold associations to the original CAD information like geometry, meta data and Product and Manufacturing Information (PMI). It supports multiple tessellations and level-of-detail generation. 


Need to know about the JT (cab) files on this website

All cab panels are facetted (single) sheets that are visible (coloured) from both sides. For this reason all facet “normals”, that identify “front” and “back” side of the facet and that support the reflection of light and color, were not subjected to special conditions and therefore point at random in any direction. Consequence of this is that the JT viewer setting "double sided lightening" and "remove back faces" never should be set "enabled" as this will render facet backsides either into a “black void” or invisible.

JT plug-in required!

For an ever growing number of different CAD system makes and animation / visualization software a JT import and export functionality is either delivered as standard or made available as a "plug-in" feature (often developed by third party suppliers) enabling users to create "JT type" files of their own constructions.

Where to find a JT viewer

A free of charge JT viewer (JT2GO) is available on the PLM SIEMENS website. Also several more advanced JT software packages, enabling users to translate components in any direction, change color and add lightening/reflections on JT data can be found via the contact addresses on their website.

Composing images

JT2GO Viewer basics:

1: this viewer can only handle one 0,0,0 point within its viewer window.

2: any component added into the JT2GO viewer automatically will be located on the 0,0,0 point of the viewer window and cannot be moved from that location.

In relation to the above it is mandatory that each individual (new) component is created (*) with its 0,0,0 point at the correct position relative to the 0,0,0 point of the chassis frame that will receive it. A component prepared in this way will be "forced" to position itself at the "right" place in the assembly when inserted.

(*) check for the XYZ coordinate orientation as used in ALL DAF chassis files and cabs before new components are exported in the JT file format.


New component bodies may not start on a dimension that is smaller the sum of the AC + CB values (viewed in the X direction) in order to stay clear of the cab rear wall and air intake system (All AC and minimum CB values are listed in chapter 2.10 of the Bodybuilder Guidelines).

For adding components into an JT assembly use the "INSERT" command (See the Viewer function help file).

See illustrating the combination of a chassis and cab. (Also see the viewer function on example file).

Viewer functions

Assemblies and navigator tree

Assemblies are build with the "INSERT"command. (visual "on/off" control per component is available within the navigator window)

Section and View Clip function / 3D measuring

After pre-selecting a single component it becomes possible to individually section it. If no selection is made all components will be sectioned. New "sections" affect (overrule) previous ones. "Save" sections with a screen dump image for future reference, if required. The "View Clipping" function, as standard, always sections all components within a full assembly simulateously. Measuring in 3D is based upon picking points on or vertices of component edges.

Component interference

There is no warning generated when components overlap; a visual check is always required.

Please note that for making visually enhanced images that include an extended range of colors, a variety of lightening sources, shadows, reflections, a “real life” environment on the background and the "save" command a high end JT software package (licensed versions) is required.  

(Consult the PLM SIEMENS website for more information.)

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