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Thread: Tensile membrane structure, with hole cut in top

  1. #1
    Member Alfienoakes's Avatar
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    Tensile membrane structure, with hole cut in top

    I am trying to create an entrance canopy that is a tensile structure, 4 corners, with a hole in the top. I have started with the Generic Model Adaptive template family, as I know this will need to be pulled and pushed around (work is for architect so WILL change multiple times)

    I can create the bones of the canopy, but I cant seem to work out how to slice a hole in the top.? If I can create the hole in the top, I should then be able to pull the circle around and fine tune my shape.

    I have attached an image of what I have created so far, and an image of the sort of thing I am trying to get to (image not mine by the way). I'm sure I am missing one simple thing, but I cant see it at the moment..

    Any tips greatly received.

    Cheers
    Attached Thumbnails Attached Thumbnails Tensile membrane structure, with hole cut in top-canopy-01.jpg   Tensile membrane structure, with hole cut in top-canopy-02.jpg  

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    Member Alfienoakes's Avatar
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    OK.. so leave me alone for long enough and I will make my brain work it out....

    Not having used Adaptive components / mass's much, I am used to creating families where a "VOID" object is used to cut a hole in something.. But just to keep me on my toes, its a solid that cuts a hole in something when using Masses..?? Is that designed so that when I apply logic to a problem, it keeps me on my toes..?

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    Member Alfienoakes's Avatar
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    I have switched to Max, as I can easily recreate what I want... only to find that getting it into Revit, and then trying to get it to either integrate with the scene, or apply a roof to, is almost impossible..

    So.. I have attached some images of my Max file and am appealing to the Mass / adaptive elements masters out there.. Any ideas on how I would best create this in Revit..? I dont want someone to do this for me, just push me off in the right direction..

    Yours hoping... Andy.. ;-)Tensile membrane structure, with hole cut in top-canopy-05.jpgTensile membrane structure, with hole cut in top-canopy-04.jpgTensile membrane structure, with hole cut in top-canopy-03.jpg

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    Autodesk Scott D Davis's Avatar
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    you can create a void to cut a solid or a surface in Revit. if you have already created the cylinder, click on it and in the properties, change it from a solid to a void.

    I will try and create your shape and post it here for you to take a look at. i know you dont want someone to do it for you, but sometimes an example is the best method. :-)
    Last edited by Scott D Davis; August 9th, 2013 at 03:12 PM.

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    Member Alfienoakes's Avatar
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    Hi Scott..

    If your OK to do that it would be fantastic. At least I can then "reverse engineer" it. Its the circular bit at the top I am struggling with. In MAX I can create that bad boy and drag it around till my hearts content. But I can seem to do a similar thing in Revit. I know its because I dont use Revit for these types of shapes, but I need to learn it really..!!

    Many thanks

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    Forum Co-Founder Alfredo Medina's Avatar
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    Quote Originally Posted by Alfienoakes View Post
    ... I am used to creating families where a "VOID" object is used to cut a hole in something...
    Any ideas on how I would best create this in Revit..? I dont want someone to do this for me, just push me off in the right direction..
    Not necessarily a "void" is a good solution in this case. A void on a curved surface sloping down like this will create some weird cuts, not a nice circle. A better solution is to create the circular hole with the four faces that make up the canopy, and then make a swept solid at that location to represent the structural tube where the fabric is tied to. Just as in construction, the canopy family is created first flat on the floor, and then lifted, as shown in this video. I hope it helps.
    Attached Thumbnails Attached Thumbnails Tensile membrane structure, with hole cut in top-8-10-2013-8-51-55-pm.jpg  

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    Senior Member PijPiwo's Avatar
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    Alf, I was playing with this a little a few days ago and came up with something like that. I used adaptive and shape handle points (for max flexibility) with nested family hoping that these four ridges could be eliminated by changing the shape of the form a little bit, but it didn’t work. I see you haven’t had much luck either. Is it even possible to do it revit, exactly as OP's picture shows?
    Attached Thumbnails Attached Thumbnails Tensile membrane structure, with hole cut in top-roof.jpg  
    Last edited by PijPiwo; August 11th, 2013 at 04:13 AM.

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    Senior Member PijPiwo's Avatar
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    2nd try, not quite there yet, time consuming and not very flexible. Some of those points will have to be shape handles I guess, but still pita to adjust.
    Giving up.
    Attached Thumbnails Attached Thumbnails Tensile membrane structure, with hole cut in top-2nd-try.jpg  

  9. #9
    Forum Co-Founder Alfredo Medina's Avatar
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    Pijpiwo, I think the goal is to make the canopy as in the picture on the right side in post # 1, which can be done as shown in my previous post, just modifying the location of the points. I don't understand what you are trying to do now.

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    Senior Member PijPiwo's Avatar
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    I’m trying to get rid of those sharp corner curved ridges (attached pic), so the surface is smooth. I did it as you have shown, but for some reason I can’t get rid of them. Also, when I move the points the surface is splitting apart on these ridges like they are not attached to each other . Obviously I must be doing something wrong. Oh well, …back to work.
    Attached Thumbnails Attached Thumbnails Tensile membrane structure, with hole cut in top-capture1.jpg  

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