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  • 2 Post By Steve_Stafford

Thread: Modelling a cushion?

  1. #1
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    Modelling a cushion?

    Hello I am trying to model a cushion in family editor.
    Should be pretty simple no?
    I have created top part of cushion with blend tool using to profiles, drawn on same reference plane with just a profile depth to give extrusion effect.
    However, I cannot mirror it or copy and then flip.

    Is this because the way Revit reads it, i.e. an item with a top and a bottom cannot be copied and flipped it will still read as top and bottom?
    Strange you can rotate a copy through 90 but not 180 degrees.
    Attached Thumbnails Attached Thumbnails Modelling a cushion?-cushion-16-01-19.jpg  

  2. #2
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    you can just simply copy it, and pull the top part down so it becomes the bottom (ie pull it lower than the current bottom) but that said, its a simple extrusion...try using a swept blend rather than a blend...or just create the lower half again reversing the top/bottom shapes for the sketch.

  3. #3
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    I can create shape I want using extrusion tool creating 4 or more shapes.
    I can try opposite of Boolean i.e. join shapes, however I am not able to entirely join shapes and image below represents how close I can get.
    I am trying to use swept blend without much luck.
    I create path and then create profiles using work plane tool to orient myself.
    So should be I see path as a simple dot.
    However when I look at screen profiles appear as greyed-out lines not pink lines as in other parts of family editor.
    So where is my mistake?
    Incidentally a Revit user like MrJimCowan uses swept blend with three profiles. Is that possible or even with four?

    All help gratefully received.
    Attached Thumbnails Attached Thumbnails Modelling a cushion?-boolean-1-18-19a.jpg  

  4. #4
    Mr. Revit OpEd
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    Two solids, one extrusion, one sweep. Join Geometry.

    If the profile of the sweep is "inside" the path then that creates a condition with the form is what they call "self-intersecting" and Revit refuses/can't generate that form. The same thing is true of the void trying to carve off the solid form. The profile needs to be on the "outside" of the path. That means you have to work out how to constrain it compensating for the size of the form you want to end up with.
    Attached Thumbnails Attached Thumbnails Modelling a cushion?-solid.jpg  
    jmk and cganiere like this.

  5. #5
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    Thank you Mr Steve Stafford for your help.
    I seem to have solved my problem by following the old scientific method “try everything you can think of”.
    I would still like to clarify a few issues.
    I will simply show you my approach. Extrude for centre of shape is pretty easy however it is with sweep that I find a problem.
    So I delete extrude and decide to proceed in the order: sweep and extrude.
    I proceed with sweep in a logical fashion. I sketch path ( a closed loop). Then I click select profile based on sketch.
    At this stage in family creation you are given a small orthogonal square to work with red dot in centre ( incidentally does this feature have a name?).
    I could draw profile in 3d but cannot since all my lines are greyed-out. Why is this? Am I drawing on a plane that is not coplanar to orthogonal drawing area with red dot? How did this happen? I seemed to have set work plane correctly.

    To extrude profile I must click on edit profile in green contextual bar. OK I can get it to work but am not sure why I had to do it this way. Why is that ?
    If I try to repeat this approach I cannot always get it to work.
    Another question. When I create sweep the inside corner is given a radius of 10mm and external radius given a value of 50mm despite distance between two reference planes being 40mm ( see illustration).
    How did this happen?
    At exactly what point on the profile does the sweep path set itself?

    Your last post, though interesting, didn’t really clarify all the issues.
    Mr Steve Stafford you say
    If the profile of the sweep is "inside" the path then that creates a condition with the form is what they call "self-intersecting" and Revit refuses/can't generate that form.
    Can you explain that in a bit more depth? As well as words, a screen capture might help.

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