Rhino lofting newbie...

Discussion in 'Software' started by henrikb, Sep 30, 2003.

  1. henrikb
    Joined: Jul 2002
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    Location: Sweden

    henrikb Senior Member

    Hi all!
    I am playing around with rhino trying to loft a hull.
    When lofting with "tight" setting, the surface does not follow the guide curves (it only does when I use the "straight sections" setting). Is this beacuse of that the hull/guide curves are not fair enough?? Or do I have to put some sections before the actual hull starts?
    Any hints please!?:confused:

    Best regards!

    /Henrik
     

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  2. ErikG
    Joined: Feb 2002
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    Location: Stockholm, Sweden

    ErikG Senior Member

    Hej Henrik

    I'll take it in english for the rest :)

    There used to be a basic tutorial for marine lofting in Rhino, I think it used to be available throgh the Rhino website, but it's not there anymore.

    Does anyone know where to find it?

    But I've had ok results with the simple shapes I've done in Rhino. For Hulls I use other sw.

    Lycka til

    ErikG
     
  3. henrikb
    Joined: Jul 2002
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    henrikb Senior Member

    Distorsion of some kind...?

    Seems like there is some sort of distortion that comes from the radii at the stem. When I loft with only one of the middle sections, stem and transom, something happens at eactly the same place with a "surface line" beginning at the radii.
    Maby I should try a larger radii or cut it away after lofting??


    /Henrik
     

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  4. SailDesign
    Joined: Jan 2003
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    Location: Jamestown, RI, USA

    SailDesign Old Phart! Stay upwind..

    Henrik,
    Can you post an unshaded view so we can see the isoparms? It's a lot easier to tell what's happening from them.
    Thanks,
    Steve
     
  5. henrikb
    Joined: Jul 2002
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    henrikb Senior Member

    Unshaded

    Here is the unshaded version
     

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  6. SailDesign
    Joined: Jan 2003
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    SailDesign Old Phart! Stay upwind..

    Interesting! I've never seen it do that before. You may find that re-defining your section curves with the same number of evenly-spaced points will reduce that. Rhino can do this for you (Curve, Edit Tools, Rebuild), relatively accurately for this kind of application.
    Steve
     
  7. Hans Friedel
    Joined: Oct 2003
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    Hans Friedel Senior Member

    Den har snott sig :D

    It is twisted

    Rhino is very fussy about how you click on the curves. Try to click on the curves in a similar way. It also helpes if the curves have similar points and degres.

    Hör av dig om det krånglar




    [​IMG]

    Hans Friedel
     
  8. Polarity
    Joined: Dec 2001
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    Polarity Senior Member

    Yep, Rhino is fussy about the clics, - make sure you click the curves at the same place on each one.

    You might also try sweep along 2 rails using the sheer and CL. rather than loft

    Paul
     

  9. SailDesign
    Joined: Jan 2003
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    Location: Jamestown, RI, USA

    SailDesign Old Phart! Stay upwind..

    Polarity has a point there. You might also want to try "Surface from Curve Network", which has worked wonders for me when all else fails (yes, it happens frequently...)
    Pic below has at least one surf created with each method, IIRC.
    Steve
     

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