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Gable End Vent Family

11 ANTWORTEN 11
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Nachricht 1 von 12
Anonymous
7615 Aufrufe, 11 Antworten

Gable End Vent Family

I'm trying to create a family for a gable end vent and I'm running into problems with getting a void to subtract from an array of rotated slats so I can achieve the tapered sides one sees with this kind of element.  Does anyone have any tips on how to do this? I've done a few families with voids in the past but something about the combination of an array and a void applied to the array appears to be problematic.  I've attached the file that represents my best effort so far.  Any help is greatly appreciated.

 

Mike

 

 traditional.jpg

11 ANTWORTEN 11
Nachricht 2 von 12
L.Maas
als Antwort auf: Anonymous

Few things. Do you need all that detail in your model?

 

My first approach would be to just use a material to fake the look or maybe to consider or some model lines. One of the first "rules" of Revit is not to model with too much detail. Especially arrays and voids are contributors to performance loss of your model

 

Alternatively, do you need to have it parametrized? Otherwise I would consider to make it just as a fixed model without any complicated arrays and voids

 

Louis

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Nachricht 3 von 12
L.Maas
als Antwort auf: L.Maas

As an example of the last, a quick example of a modeled approach. Parameter to vary the height and width.

Gable vent.png

 

Just used some reference planes with sweeps. The amount of slats is fixed. However it will take just a little bit of work to each time modify the family to suit your needs

 

Attached the family in Revit 2018 (no access to older versions at the moment)

Louis

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Nachricht 4 von 12
Anonymous
als Antwort auf: L.Maas

I guess the short answer here is that it is not vital to our cause but it would certainly help it. The use is a small custom residence where the client seems to appreciate every attempt at realism. Are you saying it isn't worth the trouble or that it is simply not possible? An alternative might be to use the curtain wall tool to create the sloped louvers. Still, the ability to impose a void on an array is something that has come up before and I'd like to know if it is possible.
Nachricht 5 von 12
Sahay_R
als Antwort auf: Anonymous

My question - is this something that you would use repeatedly?

 

Regarding the family - some suggestions - 

 

Use a window template. Modify the sketch of the opening cut. Model the trim, frame etc. Nest and array your louvers. Abandon the voids. Posted a family with the basics in place - trick it out the way you want. This family should do all that you want.


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Nachricht 6 von 12
L.Maas
als Antwort auf: Anonymous

You can cut an array with a void. There are only fewl limitations.

 

-You will have to start with the maximum amount of instances in the array.

When you increase the elements in the array, new objects are generated. The void will not cut those new objects

 

As in the screenshot Qty of array was increased from 5 to 6. You will see that last element is not cut.

So solution would be to start with maximum amount (of slats) and then decrease the elements in the array when needed (makes family potentially heavy)

Voids.png

 

Second thing is that void will only cut if the elements in the array are in the same family as the void. So a nested element cut by an a void in the host will not work. In your case you would have to create the slats and the void both in the host.

 

I would say I would not take the trouble as it will bring a lot of overhead to the project without adding much information (simple detail will be more helpful)

However if that is what you agreed with your client than you should try something

Louis

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Please mention Revit version, especially when uploading Revit files.

Nachricht 7 von 12
ToanDN
als Antwort auf: Anonymous

If you need different sizes and don't want to deal with arraying, void, and formula, then you could model each instance as curtain wall then you have a more flexible control over the overall shape/size and the spacing of the louver.

 

Capture.PNG

 

 

 

 

Nachricht 8 von 12
Viveka_CD
als Antwort auf: Anonymous

Hi @Anonymous

 

How are you doing?

 

I just wanted to follow up here, any progress on this issue?
Please mark any posts that help with "Accept as Solution" and thanks!

Nachricht 9 von 12
Anonymous
als Antwort auf: Viveka_CD

Hi.  These comments were helpful.  I wound up making a family that was easily broken BUT did the job for the project I was working in.  Ultimately I was able to make a family that could be flexed in its width and height to adapt to changes in the roof pitch or the client's desire for a more diminutive or more gracious vent.  If I changed the wall thickness I will have to go in and edit the family.  Just very hard to get the array to behave.  Candidly, I think the ability to manipulate arrays better would be met with a lot of user enthusiasm.  Still have to try out all the soft shadow input you helped initiate on my other post.  Thank you Viveka_CD.

Nachricht 10 von 12
Viveka_CD
als Antwort auf: Anonymous

Hi there @Anonymous

 

Glad to hear that you found the responses helpful, interesting to see different ideas!! Smiley (fröhlich)

 

Yes, it would be great to have additional tools for array manipulation. 

 

Btw Thanks for sharing your project PDF.Smiley (fröhlich) and sure let us know your updates on soft shadows! Please submit your ideas to the idea station too.

 

Regards,

Nachricht 11 von 12
chrisplyler
als Antwort auf: Anonymous


@Anonymous wrote:

Hi.  These comments were helpful.  I wound up making a family that was easily broken BUT did the job for the project I was working in.  Ultimately I was able to make a family that could be flexed in its width and height to adapt to changes in the roof pitch or the client's desire for a more diminutive or more gracious vent.  If I changed the wall thickness I will have to go in and edit the family.  Just very hard to get the array to behave.  Candidly, I think the ability to manipulate arrays better would be met with a lot of user enthusiasm.  Still have to try out all the soft shadow input you helped initiate on my other post.  Thank you Viveka_CD.


I'm glad to hear you figured out a solution that at least worked for now.

 

RE. the client's desire... it's certainly desirable to keep the client happy, but... you are aware that there may be a calculated minimum free air area required by code, right?

Nachricht 12 von 12
Anonymous
als Antwort auf: chrisplyler

The gable end vent is associated with the use of a whole house fan. Because a large portion of the house is framed with cathedral ceilings and utilizes closed cell insulation, the attic space is considerably reduced. Nevertheless, your comment is duly noted and worthy of consideration. If we have to we will likely supplement the attic ventilation with a ridge vent.

Regards,

Mike

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