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Thread: Hosting a Pendant light to a vaulted ceiling

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    Hosting a Pendant light to a vaulted ceiling

    I am trying to host a pendant light to a vaulted ceiling, and it will host just fine but will be on the same angle as the ceiling, how do I get it to host to the ceiling but hang correctly so it looks right in the 3D view. I'm using 2013

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    as seen here...
    Attached Thumbnails Attached Thumbnails Hosting a Pendant light to a vaulted ceiling-capture.jpg  

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    jmk
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    This blog entry: "Gravity in Revit" talks about one way of doing it. I think I found it through a link on this forum at some point. Do you need both 3d and 2d?
    Lkenshalo likes this.

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    If you forsee this coming up often with different fixtures and don't want to re-create or edit family files you could place a horizontal work plane at the point of contact and hang it from there. it will hang correctly but won't be attached to the ceiling so if the roof changes elevation or angle you'll need to manually adjust the plane. Also, the ceiling attachments won't align to the ceiling angle.

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    Forum Co-Founder Twiceroadsfool's Avatar
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    You can do it that way, but i would think LONG and hard about making all of your light fixtures Adaptive components, just to get hanging cables to be the right height. Sure, itll work... But AC's are a bit intense, just for that purpose. Plus they are what i call "performance expensive." Not to mention you then wont have a great way to tell it what height the fixture is at, unless you make MORE Adaptive Points that touch the floor, or the *intended height.*

    A simple Work Plane Based or Face Based family, where you place it on a work plane at the desired height, that then has three instance parameters with pull tabs for how long each cable is, can get you there as well, and its much more lightweight, albeit not as "graceful." But id wager itll be easier to manipulate over the life span of the project.

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    I was just wondering if there was a way to show the fixture correctly in 3D. It looks fine in plan view, but as you can see from the snap shot its on an angle.

    thanks

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    Both solutions will make it look correct in 3D.

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    I have always taken Twiceroadsfool approach...edit family and make "cables" instances and adjust..usually u only have to do this twice and you can copy them when you really think about it (depending how many rows on each side of the roof you have)

    this way it is oriented correctly and is at the height it was designed for

    my vote is work plane with instance...

    one "negative" that was mention for the work plane solution was it is no longer connected to the ceiling......unless it was a DRAMATIC ceiling height change (which you would want to totally redesign the lighting for anyways) you shouldn't need to adjust anything because the Height of the lighting does not have to change....kind of the best part of mounting lights with cable

    This is also from the perspective from someone who runs lighting calcs in the model

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    The challenge with any method for this fixture is that you've got three points of attachment.

    I don't remember where I got the basic structure for this family (I think it was her on RfO) but you can see the complexity of a fixture that has 4 mounting points and extrapolate that to one that has 3. (It's really not that bad... just a great deal of trig.) The downside to a family like this, as opposed to the AC version, is you have to manually update the family instances if the slope changes.

    I don't know how you would do this multi-point attachment with an AC but I'm sure it could be done.

    Like Aaron said, AC's can be memory hogs. I don't know if the "Gravity in Revit" approach has been done enough to dissuade you from using it but forewarned is forearmed.

    I've been playing with the AC approach and have developed a Dynamo definition to auto-calculate the length of the pendant based on a user defined height AFF. If you head down this road and are interested let me know.

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