Forums >> Revit Building >> Technical Support >> Parametric family behaving

DukeW

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Joined: Tue, Feb 7, 2012
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I am trying to make a LBDF for wood roof trusses in cross section.  I built a truss family with the member dimensions - top chord depth and bottom chord depth (type parameters).  There is a filled region between the top member and the bottom member that depicts the truss web beyond, and the edges of that are locked to the faces of the chord members so graphically it looks good.  I have a ref plane at the bottom and top of the overall truss.  This is labelled as "truss_depth".

Ideally, I would like that to be an instance parameter so that once you draw the LBDF with the appropriate parameters set, you can drag the top reference plane of that particular set up and down to match the roof cut you need to fill.  But every time I try that, it behaves oddly in the host family - either the arrayed trusses stay the default height no matter where I drag the grip (only the endcap is affected) or else they do a weird stagger thing where some move up and some move down.

Any ideas?  I have attached the LBDF file.  This was done in Revit Architecture 2012.  Thanks for any help!

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teafoe5

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Joined: Fri, Nov 12, 2010
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Create your profile in a seperate family with the truss_depth parameter and nest it in to your parent family.  Then you need to assign the parameter to the nested family in the parent family.  Arrays are a bit tricky this way.  I cannot attach an example because  I am in 2014 but see this post

http://www.revitcity.com/forums.php?action=viewthread&thread_id=27517

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DukeW

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teafoe5 - Thanks!  If you can quickly and easily update it please do, because we have updated to 2014 as well.  I just had not updated that family yet.  Thanks for the help either way.

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teafoe5

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Joined: Fri, Nov 12, 2010
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You have to click on the family and in the properties u need to assign the truss depth parameter to you family so the truss depth parameter in reads in both families.

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teafoe5

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