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Thread: Tensile membrane structure, with hole cut in top

  1. #11
    Forum Co-Founder Alfredo Medina's Avatar
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    Those seams are going to be there because the canopy is made of four faces. If we don't want to see them, they can be eliminated with invisible lines in a project.

  2. #12
    Senior Member PijPiwo's Avatar
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    Yeah, I figured. I tried to do it in one continuous spline to have only one surface or at least smooth transition between spline segments. Didn’t work so well, great exercise though.

    How about splitting then (see pic)? I think it is because there is no common edge, isn’t it? In this tutorial Modeling a tensile fabric roof in Revit - Blogs - Planta1 Revit Online Consulting your common edge between surfaces is spline #3, so no separation occurs. Am I on the right track, or totally lost it?
    Attached Thumbnails Attached Thumbnails Tensile membrane structure, with hole cut in top-splitting.jpg  

  3. #13
    Moderator gaby424's Avatar
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    maybe you like this
    more 3dmax transition style as in post number 3.

    2013-08-12_0023 - gaby424's library
    Attached Thumbnails Attached Thumbnails Tensile membrane structure, with hole cut in top-tensile.png  
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  4. #14
    Senior Member PijPiwo's Avatar
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    Gaby, this is AWESOME! (I knew I was on the right track )

  5. #15
    Member Alfienoakes's Avatar
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    Wow. This was just the kind of debate I had hoped to spark..

    Thanks to all of you for these helpful inputs. I have posted where I am at, which is further than where I was last week..!

    What I would now like to do, is create something that doesn't have the "edges" now, so it looks like a one piece skin thats being pulled from above. I did try adding some more profiles, but as PrjPiwo mention, the faces start to pull away from each other. Alf, as usual your tutorials are great, and I have used the "tent" type structure as a great basis. Gaby, yours had the smoothness I am after, but I cant view 2014 files at the mo..

    I will have a look at this, but if anyone has any other thoughts, it would be great to hear. I will post any updates.

    Cheers
    Attached Thumbnails Attached Thumbnails Tensile membrane structure, with hole cut in top-canopy-06.jpg  

  6. #16
    Member Alfienoakes's Avatar
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    OK.. This is about as far as I reckon I can go with this.

    Getting a lot of errors depending on which reference point I try an drag around, and how much I try and drag it now. The exact error is:

    Unable to create form element: self-intersecting or singular geometry would result.

    So obviously pulling something around I shouldn't be..........

    The original method that Alf suggested, gives me more flexibility, but some hard edges. This version gives me a more "organic" look, but less flexibility..

    Cheers
    Attached Thumbnails Attached Thumbnails Tensile membrane structure, with hole cut in top-canopy-08.jpg   Tensile membrane structure, with hole cut in top-canopy-07.jpg  

  7. #17
    Forum Co-Founder Alfredo Medina's Avatar
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    The real tents have those seams, even more. I don´t see why the seams should be "removed" from the Revit family.
    Attached Thumbnails Attached Thumbnails Tensile membrane structure, with hole cut in top-8-30-2013-6-41-26-pm.jpg  

  8. #18
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    Hey everyone, I'm just starting to get used to Revit and I thought it would take me forever to make a tensile membrane.. WRONG! maybe this example is not the most complex one but I think it's very simple and practical to start with, and then one could add and play with reference points to get the desired shape?

    Anyways, here is the link to the tutorial that helped me get started: https://www.youtube.com/watch?v=ApW9J5gxf2w

  9. #19
    Member Andrew P's Avatar
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    Quote Originally Posted by Alfredo Medina View Post
    The real tents have those seams, even more. I don´t see why the seams should be "removed" from the Revit family.
    Because in many cases you want a continuous surface, especially when you want to ad a curtain wall pattern based on it.
    FrenchQuarters likes this.

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