Hi Mike, is it the hull that you're focused on first?

There are some links to different discussions on ship hull modeling gathered here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3814.1

Some of that information may help.

- Michael

Hello Mike,

While it is Rhino specific you might pick up some good pointers and tutorials from this link:

http://rhinocentre.blogspot.com/search/label/15%20Marine%20Design

Hope it helps.

Andrei no sarcasm :) ...it's opposite !
I just have thought to use your energy and enthusiasm to give some tips quickly,you're very fast with your method
That's why i invite you ;)

Pace-Mir !

M

A long time ago, pre-MoI useage, with Alibre, I arduously did a canoe with gunnel curves, keel curves, estimated cross sections,
and loft(s). Google has deck plans.

thanks all for your tips! (almost all)

Usually I'm modelling in C4D and can handle well all kind of shapes normally!

But I never built a ship-hull and without having exact blueprints
the tricky part for me is to get a "clean" surface in the area, where the curvature/bend
starts from the straight side to the nose. This bend is along a diagonal line and
always looks inaccurate.

I have a reference which I have to rebuild as exact as possible, but only from the side view.


I'll keep on trying!

thanks
Mike

These may help: (found on net - searched for "Holland America Ossterdam Deck Plans")

Not sure their in proportion or even of the same ship...











Oooh, a good side view:

Hull - 5 Minutes work)

Have no blueprints, just made it to show you the mehtod.
If you are not going to build real ship from this model, but made it for render or 3D printing this method for you)!



Loft (loose, exact)

Project:
https://docs.google.com/file/d/0B9EKfPF6omtHTEtrd19wYjZQTjA/edit?usp=sharing


-----------------------------------------
Portfolio: www.samardac.tumblr.com

Cool!
Lofting in the sea!

In French "lofer" is to luff on the waves! :)

Pilou, cool analogy :))

Hi Andrei,

cool! Thanks very much!

I tried all the time with loft-curves in the other direction (from rear to front)
Maybe that made me such troubles. Your workflow seams to produce
smoother results in that bulge areas.

thanks

MIke

Hi Mike,

thanks for the images!

I got deck-plans for my ship, but they don't cover
the ship hull entirely like in your example (only to the middle of the hull)
They are helpfull for the building, but not for the hull.


thanks!
MIke

For the Vista class cruise ships, of which there are about 17, searching google for "(sister ship names) dry dock photos,"
brings up some nice pictures of the bow, a few of the stern, some aerials, and scads of interiors.
The bulbous thing on the bow, bow thrusters, and stern are impressive.

Mike, no problem)

Very cool Andrei...I really like your method and it provides a whole new dimension to MOI (especially if Michael adds the loft to point).
One question....Do you use the normal or loose option in your loft method?
Thanks!

Niko, Thanx)
I use only - Loose. Normal will not able to get this Sub-D like deformations.
Also use Exact. For example this hull was modeled with Exact. Other function do not work good in different cases.

>I really like your method and it provides a whole new dimension to MOI (especially if Michael adds the loft to point).

Michael is going to add loft to point, it will good upgrade.
I have some thoughts on how to make loft more advanced or may be make alternative version of MOI -Freestyle, where Loft will be on the first place, like push/pull in Sketch Up. It will have less commands and cost cheaper. But Michael works one and it's hard for him to lead 2 projects.
Also I'm afraid that Michael is not very interested in this not precise method. He concentrates more on CAD type modeling tools.
But I think there is a lot of users from Art department where precision is not so critical and they will be glad to use moi for their needs. With it's ability to export different polygonal cage it can be very useful for game creating assets especially in hard surface.
Any way, MOI now has all tools that is absolutely enough for me. And all that I said above is just thoughts that may be not very good:))

me again - sorry!

The Modelling method works very well and I got the hull shape quite well.
But another problem occures now:
When trying to trimm the windows, some are working well,
but with others, the hull-shape gets broken.

What I'm doing wrong here?
Window path is the same like the ones which worked.

thanks again!
Mike

Hi Mike, you can get weird looking "leaky trims" like that if the trimming boundaries have little self-intersecting loops in them.

It would help to see what's going on in your particular case if you could post a 3DM model file with the particular surface and cutting curve that is causing you problems with trim, it's much easier to give feedback about a problem when being able to look at the actual geometry instead of only a screenshot.

Is it possible that the cutting curve is not entirely on the surface? If it's some kidn of warped 3D curve that is not actually on the surface that can make for some difficulties with Trim. It's usually best to trim with a 2D profile curve instead of a warped 3D one. Trim will automatically project 2D cutting curve so you don't need to do any separate step of trying to get the trim curves to follow the surface manually if that's what you've been trying to do.

But again if you can post a 3DM model file that makes it a lot easier to see what in particular is going on, there are potentially many different kinds of things that can be problematic, like if you had any little loops or overshoots in the trim curves or if they were not actually closed curves that could cause generally similar looking problems.

- Michael

Hi Michael,

sorry I cannot post that file cause its confidential.

The shape I trimmed is a 2d curve which projects in front of the hull model.
The other curves (like Image 1) are exactly the same and worked well.

So I think its, what you mentioned, the little loops problem.
But how can I check this?
Or how can I solve this?

thanks
MIke

Hi Mike, unfortunately it's really difficult to help you very effectively without seeing your objects. You don't need to post an entire model, just the one surface that you are trimming and the one cutting curve would do.

If you want to keep it confidential you can e-mail them to me at moi@moi3d.com.

If you can't send anything at all, then the main thing you'd want to do is closely examine the cutting curve, zoom in to them very closely and look for anomalies. Turn on control points and pull them around and look at how it deforms, if there is any "back tracking" with the curve coming back over itself (which makes it self intersecting). Look at the object type indicator in the upper right corner of the window when the curve is selected, does it read "Closed crv" or just plain "crv". Try squishing it down in the top or side view and see if it gets a "flat" snap or not - if it does not then it's not actually planar. Those are some of the various things I would do myself to investigate the cutting curve to see if it is well formed or not. There are possibly some other kinds of diagnostic methods that I'm not thinking of right now off the top of my head, it's much more normal for someone to post the geometry to get help and then I examine the geometry closely.

Also it's pretty rare but occasionally some kinds of display problems are actually just bugs in the display mechanism itself and not problems with the geometry. One way to test for that is to do a test export to a polygon mesh format like OBJ and see if it looks different in the export mesher than it does in the modeling display.

- Michael

oh, when I use "boole mix" instead of trimm
it works!

?

regards
MIke