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Forums >> Revit Systems >> Technical Support >> Help with a duct family -trying to prevent resizing by dragging or limiting drag
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Joined: Mon, Mar 9, 2009
160 Posts
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I am in process of trying to make a duct family so we can try to piece togther a duct system so it can be scheduled and used as shop drawings. I have asked about this a few times on this site, and no one seems to be able to answer, so I guess I gotta do it myself. . . LOL.  Anyway, I made a duct family with connectors on either end and the ability to change length, width, and thickness. EASY, actually. What I now am trying to do is to prevent a duct family from being able to be dragged and resized. I want to be able to resize it within the instance properties, but not to be able to drag and change it with the curser. Is this possible? Another idea, aybe even a better one, might be to allow it to be able to drag and resize the length only, but somehow limit the length to be a maximum of 59". This would solve some other problems, but not sure if this limitation can be built into the family. I would still want the height and width non draggable however. I have attached the file if anyone would like to take a look. Any help would be appreciated.
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Joined: Tue, May 16, 2006
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It sounds like (sounds best) that duct size would be type parameters and length would be instance. You can not lock the instance but I don't see a reason to do that. You might be able to create a formula that will work for your max... something like actual_length=If (length>59",59",length)... you work on the syntax. << Don't have Revit here to test this.
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I will work on that, thank you.
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I got a formula to work. The issue I still have is the shape handle will still drag the duct as long as I want it. If I go into the properties, and change the length to 10', it will default to the 4'11" dimension per the formula, but the shape handle ignores the fornmula. How can I prevent the shape handles from exceeding the max length, or can I disable the shape handles altogether?
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Setting the Ref Planes to "not a reference" should get rid of the grips.
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If the family is sized correctly, why do you care about the shape handle? The family is correct.
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I got a formula to work. The issue I still have is the shape handle will still drag the duct as long as I want it. If I go into the properties, and change the length to 10', it will default to the 4'11" dimension per the formula, but the shape handle ignores the fornmula. How can I prevent the shape handles from exceeding the max length, or can I disable the shape handles altogether?
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Joined: Mon, Mar 9, 2009
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because the shape handle changes the length of the duct. i want to specify the duct length, and not have it change by dragging the shape handle. Also, dragging the shape handle was overiding the limitation of the max length. I made the ref plans not a ref and that worked.
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