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Thread: How dimensions and constraints work

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    How dimensions and constraints work

    I have been using Revit since 2015, and I still don't understand the method behind the dimension tool and how it determines constraints while trying to make something equal between two points. Sometimes it works, sometimes it doesn't; I just don't understand the parameters and what the constraints are. I am intending to place a model item at the center of two points and use the dimension tool to achieve this. In the example (attached image) I am trying to center the model text on the panel. To do this, I placed a dimension string on the end of each of the mullions and when I click the "eq", I get this error. I have also tried creating detail lines, and pinning them, and I still get the same error.

    I am hoping someone can explain to me how this tool works. Why does it seem to work flawlessly sometimes, and other times, like in this instance, it doesn't. it seems arbitrary so of course, I am missing something here.
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    Member Exar Kun's Avatar
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    Maybe it's just the model text being funky? Constraints never work well with model text in my experience. I tend to create a component family and place model text in there if I need it to be controlled with constraints - whether that be in a project or nested into another family.

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    Administrator Twiceroadsfool's Avatar
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    It works fine with model text,if the model text is set to center justify. I did it on Friday. Works fine.

    Sent from my Pixel 3 XL using Tapatalk

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    Moderator DaveP's Avatar
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    More often than not, when you get "Constraints are not satisfied", there's something else controlling one of the elements involved.
    Something dimensioned and locked to one (or both) of those walls perhaps?
    Click the Expand button on the error dialog and it will tell you which elements are having problems.
    You can then select one of the elements (in the dialog) and it will highlight it on the View.
    If that still doesn't help, post a screen shot of the expanded dialog & maybe we can better explain something

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    Forum Addict GMcDowellJr's Avatar
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    Dimension to the gridline instead. IIR, theres something about mullions that has an issue with dimensions.

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    Quote Originally Posted by GMcDowellJr View Post
    Dimension to the gridline instead. IIR, there’s something about mullions that has an issue with dimensions.
    ?? The OP wasnt trying to dimension to a curtain wall mullion as far as could see and dimensioning to and from mullions is never an issue if the profiles are built correctly related to the family ref planes.

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    Forum Addict GMcDowellJr's Avatar
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    Quote Originally Posted by Dave Jones View Post
    ?? The OP wasnt trying to dimension to a curtain wall mullion as far as could see and dimensioning to and from mullions is never an issue if the profiles are built correctly related to the family ref planes.
    They look like CW mullions to me but maybe not.

    The issue Im recalling with CW mullions isnt about dimensions but about trying to set an equally constraint when the dims arent already equal. Im not able to get into Revit right now to confirm so totally working from memory.

    You dont still have a sub to Revit, do you Dave?

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    Hi Greg, what do you mean by "sub to Revit"??

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    Forum Addict GMcDowellJr's Avatar
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    subscription -- you using Revit in your retirement for fun?

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    Quote Originally Posted by GMcDowellJr View Post
    subscription -- you using Revit in your retirement for fun?
    yep, although not as much as before. Still playing with Dynamo for curtain wall BOM stuff mostly

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