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Thread: Random shape tensile structure - help!

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    Random shape tensile structure - help!

    Hi everyone,
    I'm Marco and this is my first thread
    I'm a Revit beginner and I would like to get some help on how to model a tensile structure with a random shape.
    I've made a real model of it: it's a tensile structure covering a bridge ramp and opening on the flat/straight part of the bridge.
    Here's the photos of the model:




    So far I've managed, using conceptual massing families template, to get a decent overall 3d model, but the hole over the bridge is really challenging and some of the faces are not smooth and are "broken" into flat triangles = no smooth mesh.
    I've created few horizontal reference planes to host the reference points at the vertexes and/ or at the top of the poles but I get a lot of errors as Revit cannot create a form from all the reference splines I've drawn; so the only way I've found is to create forms from 3-4 splines at the time.
    It works OK but I hope that someone can suggest some better method to create such a complicated shape of tensile structure.

    I've also tried with several vertical reference planes but, not knowing the exact shape of the whole structure, it's impossible to draw its profile on each vertical reference plane.
    So far, the above method works decently, although it takes a lot of time adjusting/moving each individual point to achieve a good result.
    I just know where most vertices are and their position, the midpoints are a fine tuning game.

    I did try with adaptive components, creating a flat surface with adaptive points/handles and then placing them into a project where the posts were but it did not work at all... sigh.

    Can anyone provide useful tips and tell me which is the way/procedure to do it?

    Thank you very much for the help

    Marco
    Attached Thumbnails Attached Thumbnails Random shape tensile structure - help!-img_20190303_083406430_small.jpg   Random shape tensile structure - help!-img_20190303_083406430_small.jpg   Random shape tensile structure - help!-img-20190304-wa0001_small.jpg  
    Last edited by Debo; April 11th, 2019 at 12:44 PM.

  2. #2
    Forum Co-Founder Alfredo Medina's Avatar
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    Welcome to the forum, Marco.
    Please try again to post the photos of the model. You can edit your first post or make a new post.

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    Forum Addict elton williams's Avatar
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    Quote Originally Posted by Alfredo Medina View Post
    Welcome to the forum, Marco.
    Please try again to post the photos of the model. You can edit your first post or make a new post.
    I think he can't post pics because new user < 5 posts

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    Forum Co-Founder Alfredo Medina's Avatar
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    Quote Originally Posted by elton williams View Post
    I think he can't post pics because new user < 5 posts
    Oh, I didn't know that. Thanks.

  5. #5
    Mr. Revit OpEd
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    Perhaps a new user should just be moderated for those first few posts instead of preventing them from sharing useful information to help get an answer?
    Alfredo Medina likes this.

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    Hi guys, it's my first post and i did check and previewed it - photos were there - before posting but clearly something went wrong.
    I've edited the post but, if more photos are needed, i can add a Drop Box link
    Thank you for the feedback

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    Forum Addict elton williams's Avatar
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    Quote Originally Posted by Debo View Post
    Hi guys, it's my first post and i did check and previewed it - photos were there - before posting but clearly something went wrong.
    I've edited the post but, if more photos are needed, i can add a Drop Box link
    Thank you for the feedback
    im just going to bed but Alfredo, I fully expect to see your solution in the morning

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    Forum Co-Founder Alfredo Medina's Avatar
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    Quote Originally Posted by Debo View Post
    ...Can anyone provide useful tips and tell me which is the way/procedure to do it?
    You said you wanted some tips:

    1) When tents arrive at a job site, workers extend the fabric flat on the floor, first. Then, they tie points of the fabric to supports, then they lift it. Making a family for a tent follows the same sequence, first, you make it as a flat surface. Then, you raise points. Some points represent supports, other intermediate points control the low points of the curves between supports, other points define edges.

    2) Revit "likes" splines that go in the same direction, parallel or "kind of" parallel. Therefore, look at the shape, and see how many splines kind of parallel it requires, and then create splines in that main direction only, then Create Form, then lift the tent.

    3) Go to YouTube and watch my video, entitled "Modeling a tensile fabric roof in Revit", posted 7 years ago, with 28,000+ views now. The video is here in Revitforum, too, at: https://www.revitforum.org/architect...html#post54250

    4) Modeling this needs just points, lines, and surfaces, not necessarily a script with nodes.
    Last edited by Alfredo Medina; April 13th, 2019 at 12:47 AM. Reason: link to video
    elton williams and Dave Jones like this.

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    Hi Alfredo, thank you for your feedback.
    I've watched the video and that got me started on using the conceptual massing instead of adaptive - mostly used on tensile structures video tutorials.

    Points and splines got me here:


    You point #2 is very interesting and i will try to apply it.
    Due to the shape of the fabric, it's very hard to find parallel lines.
    I think the main issue with this task lies in its random shape and "impossibility" to find and draw parallel splines

    Thank you

    Marco
    Attached Thumbnails Attached Thumbnails Random shape tensile structure - help!-revit-sail-01.jpg  

  10. #10
    Forum Co-Founder Alfredo Medina's Avatar
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    Hmm... No, please watch the video again. The result should be a smooth surface, not a triangulated surface.
    The template should be generic model adaptive. The mass template should be used only if you need levels for a building and mass floors.

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