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Thread: curtain wall window panel offset

  1. #1
    Senior Member biff's Avatar
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    curtain wall window panel offset

    Hi,
    I've made a curtain wall window panel. Everything flexes, I've allowed for glazing thickness, depth and width of frame and materials for both.
    My question is creating the offset parameter for the panel once loaded into the curtain wall. (not a glazing offset). I can't edit and view the system family panels to see how they work their offset. But you can create a negative offset in them.
    In mine the closest I've come is creating the family on a ref plane that is offset from the centre plane, and the offset dim applied. That all works, but it naturally won't allow a negative offset, and the only workaround is to flip the window panel.
    Does anybody know how to create a offset parameter for a curtain panel (in this case a window) that allows a negative input, a la the system panels already in the template?
    Last edited by biff; August 27th, 2018 at 07:20 AM.

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    Forum Addict elton williams's Avatar
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    Use a second reference plane for an offset in the opposite direction, then using 1 extra (user input) parameter create some driving formulas which allow negative input to the user input.
    I'm not near revit atm but can upload an example in an hour or so if you dont solve it by then.

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    Senior Member biff's Avatar
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    Thanks elton, not sure on how i would construct that user input parameter driving formulas. Dont stress, if you have time it would be good.
    I've taken my class through everything but the offset, as was thinking this would be the icing on the cake. So they have everything but built. But it is has involved a far few more ref planes, adjustment etc, just to create an offset.
    I had a thought it might be driven by using a ref line in some way, but obviously not.

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    Forum Addict elton williams's Avatar
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    Quote Originally Posted by biff View Post
    Thanks elton, not sure on how i would construct that user input parameter driving formulas. Dont stress, if you have time it would be good.
    I've taken my class through everything but the offset, as was thinking this would be the icing on the cake. So they have everything but built. But it is has involved a far few more ref planes, adjustment etc, just to create an offset.
    I had a thought it might be driven by using a ref line in some way, but obviously not.
    I left my hard drive at work but i bashed this simple curtain panel family together for you. Not sure what revit you're using but I used v2015 to be safe, and hence the dodgy family types dialogue. There's no geometry inside the family but it'll show you how a couple of simple formulas can work together (or against each other?) to push your offsets in either direction. You could also use this method to move stuff in any other axis too. - EG I recently made a 2D fixtures symbol family for someone which can move a nested label in +&- x/y directions.

    First image shows how to place and dimension your RP's, one either side of the centre front/back RP. I've set this up to move to the exterior on a + input & move to interior on a - input as this is default CP behaviour but you could set it either way. I find to easier to not apply any formulas yet so you can flex either way during testing. The (user input) Offset parameter does nothing yet, but I gave it a value anyway.



    Second images shows the formulas controlling the driving parameters and how they use the user input parameter to decide if it they should move away from 0 length.
    In this case a negative value of 'Offset' is applied to the 'interior offset' constraint. As a negative of a negative is a positive, the 'offset interior' RP moves in a positive direction.
    You'll also see that once the formulas are in place the RP's begin to overlap which can make choosing the correct RP for building geometry difficult (or error prone). This is why I don't apply the formulas until I know my family works. Until then I use the driving parameters to flex things.

    Attached Thumbnails Attached Thumbnails curtain wall window panel offset-cp_offsets_formulas.png   curtain wall window panel offset-cp_offsets_formulas_2.png  
    Attached Files Attached Files
    scourdx likes this.

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    Senior Member biff's Avatar
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    Thanks so much elton. Thats a big help. Expains it well. Im using 2018. I keep the classes on the calendar year here, or else we have cad rooms and students upgrading half way through year, and all hell breaks loose.
    I will give this a try and see how it goes. Good way to show the if syntax being used.

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    To cut down on the ref plane confusion (with 0 offset, there's 3 ref planes overlapping), I make the Center and positive offset planes very short and off to the side. The only one that crosses the vertical CL plane is the negative offset, which I rename to "Baseline" (since this is the one you want to base your work from).

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    Senior Member biff's Avatar
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    Gotcha. ......

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    Forum Addict elton williams's Avatar
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    Quote Originally Posted by cellersick View Post
    To cut down on the ref plane confusion (with 0 offset, there's 3 ref planes overlapping), I make the Center and positive offset planes very short and off to the side. The only one that crosses the vertical CL plane is the negative offset, which I rename to "Baseline" (since this is the one you want to base your work from).
    My OCD doesnt allow that

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    Not hosting on central plane?

    Quote Originally Posted by elton williams View Post
    My OCD doesnt allow that
    Hey Elton

    The formulas you're using are great, but i dont understand the first image?
    Maybe you could place a geometry somewhere, because it really doesn't make sense to me that the geometry is placed on the lowest plane, then the External Offset doesn't seem at all 'snapping' to it? It will be really helpful to see where do you set and lock the geometry in this context that you are showing here..
    I usually use the Center (Front/Back) plane to locate the facade contour for the curtain panel, so thats where I would host it, but I don't see the plane here..

    Please explain, this post might finally put the missing piece in the puzzle for me.

    Thank you in advance.
    Kalo

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    Hey Elton

    The formulas you're using are great, but i dont understand the first image?
    Maybe you could place a geometry somewhere, because it really doesn't make sense to me that the geometry is placed on the lowest plane, then the External Offset doesn't seem at all 'snapping' to it? It will be really helpful to see where do you set and lock the geometry in this context that you are showing here..
    I usually use the Center (Front/Back) plane to locate the facade contour for the curtain panel, so thats where I would host it, but I don't see the plane here..

    Please explain, this post might finally put the missing piece in the puzzle for me.

    Thank you in advance.
    Kalo

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