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Thread: Reference Line keeps breaking

  1. #1
    Member mark2009's Avatar
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    Reference Line keeps breaking

    Hey guys,

    Can someone please help me. Why is it when i change my angle input to 0 then change it back to 45 the reference line breaks.
    Reference Line keeps breaking-reference-line-breaks.jpgBRAKES.rfa

  2. #2
    Moderator snowyweston's Avatar
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    Angular dimension(al) constraints are notoriously picky when they reach the 0 and 90 quadrants.

    Some (including myself) use 'limiters' (an angle-dim-locked ref. line 'tied' to the primary) that restricts the angle from ever 'truly' being 0 (or 90) whilst returning the same (visual) effect....

    Some others employ a slightly nattier approach using arc angles - with elements hosted on/to a curved reference-line - that (apparently) is a bit more robust.

    Either way, plenty of discussion on the very same topic has been posted here, have a nose around some old threads...
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  3. #3
    Mr. Revit OpEd
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    Generally such finicky behavior will work correctly in the project while breaking in the family editor. Try it in a project, you'll probably find it works.

    Revit's own internal Automatic Sketch Dimensions (ASD) are based on orthogonal relationships. When you change the angle to 90 degress the ASD's change what they reference. You can see this if you turn them on (V/G Annotation Categories tab) in the family editor plan view. Notice where they appear and then change the angle to 90 degrees.
    Last edited by Steve_Stafford; January 12th, 2016 at 08:43 PM.
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    Member tuekappel's Avatar
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    Red face

    Quote Originally Posted by snowyweston View Post
    Angular dimension(al) constraints are notoriously picky when they reach the 0 and 90 quadrants.
    This tutorial:

    Revit OpEd: A Doors Life

    -opened my eyes to the more intricate techniques in family modeling, and it adresses the above-mentioned problem. -The angular dimension drives a ref plane in the nested family, the ref plane is skewed 5º. So the driving parameter is -5º when the door is shut, and 85º, when the door is 90º open.

    [Edit: oh, Hi, Steve ]
    Last edited by tuekappel; January 12th, 2016 at 07:43 PM.
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  5. #5
    Member mark2009's Avatar
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    Everyday is always a problem with revit I notice that yesterday it worked on project, but was curious if it was fixable in family.

  6. #6
    Mr. Revit OpEd
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    Quote Originally Posted by mark2009
    ...but was curious if it was fixable in family...
    You can control it IF you can eliminate the ASD's changing by providing the constraints Revit needs to keep the endpoints of the Reference Lines in the same location as the angles and lengths change. The ASD's only appear when there is ambiguity.

    Personally, I'd just ignore the issue in the family (by not testing it at 90 degrees) since it works where it needs to work...in the project.
    Last edited by Steve_Stafford; January 12th, 2016 at 08:42 PM.
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  7. #7
    Member mark2009's Avatar
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    noob question what does ASD stand for?

  8. #8
    Moderator snowyweston's Avatar
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    Automatic Sketch Dimensions.

    (we should probably add it to the forum abbreviations and keywords)
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    Member mark2009's Avatar
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    Thank you

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