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Forums >> Revit Structure >> Technical Support >> Face-Based Family for Void Form?

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Fri, May 13, 2011 at 7:35:08 PM | Face-Based Family for Void Form?

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krunung


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So I'm trying to create family that will cover the entire face of the host object. The particular family I'm trying to create at the moment (void form) would be attaching to the bottom of grade beams and slabs. I've created line-based families to represent this but I think it would streamline the process to have it be part of the model and I'm seeing that face-based families seem to be geared more towards things with set dimensions (length, width, etc.). Can I have it extend to the edges of the face of the host object? I'm sure a sweep would work as well but it would take that little bit of extra time to input the width of the void form. I'm sure this is possible but I'm wondering if I'm going about it the wrong way.

Thanks,


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Kris Runung

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McClone Construction Co

Wheat Ridge, CO 80033

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Fri, May 13, 2011 at 8:04:38 PM | Face-Based Family for Void Form?

#2

alabaster2513


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I just use another beam and make it the void form


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Tue, May 17, 2011 at 3:45:50 PM | Face-Based Family for Void Form?

#3

krunung


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These are just foundations though and I'm hoping that I can avoid having to draw the outline of the void form. Like I said, it would streamline the process and save time. By being able to simply click on a particular face and have it autmocatically host a family that is equal in size and confined to the perimeter of the face, the process of adding this detail to all sections and details is minimized.


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McClone Construction Co

Wheat Ridge, CO 80033

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Tue, May 17, 2011 at 4:04:20 PM | Face-Based Family for Void Form?

#4

alabaster2513


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the slab, roof or floor system families can do that but their metadata consists of perimeter, area, volume and thickness. Not Length, height and width


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Tue, May 17, 2011 at 10:04:32 PM | Face-Based Family for Void Form?

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thetabest


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As of this time, you can't. 

That information isn't available for you to use, and until a nested/hosted family is able to extract information from its host, you are SOL.  For example, if you make a screed (reveal) family, and place it in a wall, the only way you can get it to extend the length of the wall, is to have it be a line based family, which has the mechanisms for getting the wall length (obtained if you use the pick command when placing said object).  But this still has its faults, because if the wall gets longer or shorter, your object doesn't adjust also, UNLESS you constrain the ends to the ends of the walls, and if you are using this many constraints, then rumor has it you might overconstrain your model and cause mass hysteria.


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Tue, May 17, 2011 at 11:51:02 PM | Face-Based Family for Void Form?

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alabaster2513


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you most certainly can, it just depends on what you are trying to achieve ultimately.

 

i just tested my floor theory for the second time, worked great. procedure:

 

1. layed a beam down

2. used the floor command and "pick lines" in sketch mode to trace a face of the beam

3. locked the sketch lines to the face i sketched and finished the slab

4. changed the beam width

 

the slab automatically updated the width of the beam

 


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Wed, May 18, 2011 at 12:22:43 AM | Face-Based Family for Void Form?

#7

thetabest


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What you did is in the project, and you constrained the floor to the beam.  From krunung's post, it sounded like the desire was for a family which would automatically span the length of the host upon placement, which is not possible.  Its really just semantics though...


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Wed, May 18, 2011 at 3:19:38 PM | Face-Based Family for Void Form?

#8

alabaster2513


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yeah, was just curious what'd happen. and i agree with you on the semantics. I have found that basically you can do anything wih Revit. It just depends on the why not the how.


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