Objects don't have same Z reference point?

[Jake Wilson]

I have noticed recently that some symbols and objects, usually World based, don't share the same Z axis zero point.

 

In the attached file I have a stick of 12" Prolyte truss from the VW library that is good and an Applied 16" truss symbol extracted from a DWG file where I have to 3d move the truss up 8" to react the same zero Z as the Prolyte.

 

Can someone explain what's happening here and how I can change the symbol and any future symbols to avoid this?

truss Z.vwx

[Pat Stanford]

The 12" Truss is using the VW standard of the bottom of the bottom chord being at the insertion point.

 

The 16" truss is using the center of the truss as the insertion point.

 

Edit the 16" Truss Symbol and move it up 8" and you will have a symbol that will work like the 12"