Rhino lofting newbie...

[henrikb]

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!?

Best regards!

/Henrik

[ErikG]

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

[henrikb]

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

[SailDesign]

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

[henrikb]

Here is the unshaded version

[SailDesign]

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

[Hans Friedel]

Den har snott sig

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






Hans Friedel

[Polarity]

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

[SailDesign]

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