unroll surface in rhino for shell expansion

Discussion in 'Software' started by pavel915, Feb 6, 2007.

  1. pavel915
    Joined: Nov 2006
    Posts: 349
    Likes: 10, Points: 18, Legacy Rep: 154
    Location: Bangladesh

    pavel915 Senior Member

    I want to unroll the hull surface in rhino ; to get the shell expansion drawing.
    but it says that , this object can not be unrolled.
    I could unroll any hull surface importing from maxsurf , i could get the shell expansion drwang ,
    Is there any solution to it?
     
  2. CGN
    Joined: Jan 2003
    Posts: 547
    Likes: 9, Points: 18, Legacy Rep: 138
    Location: MX

    CGN Senior Member

    Hi Pavel,

    you can't unroll becouse is a double curvature surface the one you are trying to develop.

    yes you can "unroll" surfaces from maxsurf but they need to be developable or close to.

    no you can't get a shell expansion drawing, if you are actually talking about shell expansion....but if your are talking about plate layouts (developed plates) yes you can (you may need to use software like shipcam, touchcad workshop or any other that can handle double curvature surfaces)

    Yes, do shell expansion by hand, and do plate development using some software or find some technical papers on how to "unroll" by hand (lofting and layout)
     
  3. Steve Baer
    Joined: Nov 2006
    Posts: 90
    Likes: 5, Points: 0, Legacy Rep: 64
    Location: Seattle, WA

    Steve Baer Rhino Developer

  4. raw
    Joined: Jul 2006
    Posts: 133
    Likes: 5, Points: 0, Legacy Rep: 59
    Location: Oz

    raw Senior Member

    A work around is to get the surface as developable in maxsurf as possible, then import to rhino.

    Once in rhino, recreate the surface using edge curves. <loft with straight sections> which can be unrolled with rhino. Take it back to maxsurf if you need to.

    I have done it this way a few times.

    raw
     

  5. CDBarry
    Joined: Nov 2002
    Posts: 781
    Likes: 28, Points: 28, Legacy Rep: 354
    Location: Maryland

    CDBarry Senior Member

    The traditional shell expansion drawing is not a true expansion, it is a plot of true girth vs station or frame.

    You can do it by hand by interogating girths (to seams, longs, etc.) from the lines drawing, and then plotting them though it is tedious.

    Note that expansions imply plate distortion, so there is no unique solution - it depends on the distortion field.
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.