Forums >> Revit Building >> Technical Support >> Family Instant Parameter Constraints Offset

ktam

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Joined: Tue, Mar 7, 2006
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Does anybody note that certain families when loaded to the project come with an instant parameter: constraint offset, while other families do not and are locked to the level where you placed them and you and not move them up or down because there is no offset in the constaints parameter. For example if you put a desk or a chair (families which come with Revit) in your project, when you click on the component and see its property, you cannot see the "offset" parameter under constraints. That means it can not be moved up or down from the floor level.  However if you place a TV ( the one come with Revit) in you project, when you click on the component, you will see the "offset" parameter which allow you to move it up or down.

I studies the two families and tried as many things as I can think of to investigate but found no answer.  Even I erased everything in the desk family and recreate a simply box instead, when I reloaded to the project, the component still stuck to th level where you created it.

I am curious of what is the difference between the two families, both are under furniture category.  What governs a family to have an "offset" parameter under constraints when it is loaded to a project.

Anybody has any idea?

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Belinski

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Joined: Thu, Sep 27, 2007
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The tv has that offset because tvs dont go on the ground they need to be offset a certain distance up the wall

and the exact opposite goes for the desk and chair, they will always be on the ground so they dont need the offset.

if you want to add that offset to something, then you just have to add that parameter to a reference line ( that is locked to the object) and the groundline.

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ktam

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Belinski

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Thats because it is from the library and it has to do with the way they made it.

it is basically just a hidden parameter in the family, so if you need to use this offset for something else, it is possible to make yourself

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ktam

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samuelfour

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As you say, some Furniture Families have the Master Revit Parameter for Offset (like TVs), while others do not have the Parameter (Seating).  I came across the same issues you raise... just because a chair is typically on a floor, it does not mean there are cases when I need to offset the seat (every model has unique geometry conditions). 

The solution is to open a pre-built family (such as TV) which already has the Offset Parameter.  Now, open your non-offset family and copy the geometry.  Once you have deleted the original geometry from the Offset Family, you can Paste in the geometry from the Non-Offset Family.  When you save, the magic Offset Parameter appears in the Main Model. 

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