Starting in Rhino 8

[GioMun]

Hello!

 

I´m quite new in this section, so please be patient. 😌

 

I´m at the moment trying to start the art of 3d modeling our models in Rhino. Just as a form to understand the models that sometimes don´t have a good plan/drawing, and you have to take care of that (i hope you understand).

The problem is that i don´t know how to start. I have found a few tutorials on the web, but i´m having problems with generating surfaces ,curves, so, i´m still at the beginning!! 

 

I see those pencil-like drawings that some of you make and i hope to achieve that some day! It reminds me when i started on this hobby at all.

 

My question is that is there any tutorial, made for shipmodelers, that would allow, eventually to achieve those drawings i was talking about?

 

Thank you very much!!

 

Greetings.

 

Giorgio

[scrubbyj427]

You should follow all the Rhino tutorials until you are proficient with basic surface modeling and 3D construction, From there you can start constructing basic 2D plans into a wire frame 3D object. 

[GioMun]

Thank you for the answer.

 

Yes, that is what i´m trying to do right now. I´m looking at every YouTube tutorial i can find.

 

I know that is the way!

 

I was asking if there where any more specialized tutorial out there.

 

Thank you.

 

 

[scrubbyj427]

Draping surfaces, constructing basic shapes and learning the tool functions will lead you right into modeling ships.

 

Theres likely some marine focused ones. I’m also sure there’s plenty here on MSW. Lots of people are 3D modeling ships on here.

[sheepsail]

I have had positive results with DELFTShip.   There are some great tutorials on that as well.

 

Finding out if everything is not absolutely aligned, the surfaces can track wildly since the curve control points are not linear.  The farther one is away from the tangent the wider the swing.  When done in a traditional 3D solid modeling surfacing program can lead to lumpy patterns.  For most of this modeling the fewer control points the better.  So I have been going back and forth between the 2D drawings and DELFTShip.   Depending on the scale  single pixel on a low res scan can represent 1 to 3 inches or more on the model.    I think this process is called fairing. 

 

There is a lot of rinse and repeat when tracing over things.

 

DELFTShip can export STL.  Which can then be imported into the Solid modeling program.   It also comes with an online database of 100s of ship hulls.  These are interesting to look at to see where the control points are placed.    

 

The paid version can export IGES, which is probably overkill for the sort of simple modeling done.  Since we are not doing dynamic simulations.

 

[GioMun]

Thank you for the kind replies.

 

I´m collecting your advices in order to find a way to go on.

 

In the moment i am searching for tutorials, specially the ones focused on ships.

 

Thank you very much.

 

Giorgio

[GioMun]

Hello shipmates. 

 

So, this is as far as i could get by now. As you can see, i imported the shiplines from AutoCAD, and y pasted every station on the side view,

but i still can´t create the surfaces, unless the wales, wich i could manage to. 

 

I keep the fight!! I don´t know every time i try to generate the skin of the hull a problem pops up.

 

If any of you had experienced the same situation please tell me.

 

Thank you very much.

 

Greetings

[GioMun]

By the way this was the original tug i´m building.

 

 

[CDR_Ret]

Hi, Giorgio.

 

I'm with Julie on this topic. It's likely that someone proficient in Rhino would be able to eventually develop a nice hull, and then add on all the topside embellishments. However, trying to learn how to use a general-purpose 3D-CAD program like Rhino to create a hull comprised of surfaces varying in three dimensions, adhering to an existing set of basic plans, has proven to be challenging to a lot of folks attempting that.

 

DELFTship, on the other hand, is a for-the-purpose naval architectural program with built-in features, like the three standard hull form views (sheer, halfbreadth, and body plans), along with features like "intersection" lines to show stations, waterlines, buttock lines, and diagonals—that all help in hull faring process. This is almost always needed because classic vessels were constructed from hand-drawn plans, and these plans, especially if they were developed before the advent of CAD, tend to lead to lack of fidelity among the standard views. In addition, DELFTship provides surface analysis tools that enhance the faring process, like Gaussian surfaces, that visually reveal bumps in the hull surface as well as providing local curvature analyses. The program is primarily used for hydrostatic and hydrodynamic analyses, but the structural features work well for simply modeling at any scale.

 

One difficulty that most new DELFTship users have is what Julie mentioned—the surface mesh (called the control net) doesn't actually lie on a curved surface because of the mathematical way the program works, which is something you simply have to get used to.

 

I suggest that you take a look at some of the reconstruction projects here in the various forums that utilized DELFTship to see how it presents. Like most 3D modeling programs, it has its own steep learning curve, but once you become familiar with it, the results are directly useful for developing plans of a vessel hull.

 

Terry

Edited August 16 by CDR_Ret

[vaddoc]

My 2 c:

I do not think you need any specialised tutorials, just play with Rhino a bit more. There is a command to create surface, one to offset surfaces (for the thickness of planking) and another to unroll surfaces (sometimes useful). Use the command to fair lines but this needs care as it may move lines - useful also to progressively use as few points as possible for your curves. The lines need to touch for a surface to be created but lofting does not need to be perfect as the wood will correct lots of imperfections. Using fewer curves for surfaces is easier. The curves that do not play ball can later on be projected on to the surface - there is a command to project lines and points to a surface that is very useful.

 

To create the hull surface, you need to have defined the sheer (best created from two lines/views), the keel rabbet, sternpost and stem. To check for ripples and surface fairness there is the analyze surface command that contains surface analysis tools.

 

You can also import plans and lines, scale them appropriately and use them to trace lines and then position these to the 3D space.

 

I think you are almost there to be honest.

 

Best wishes

Vaddoc

[GioMun]

Thanks again for the kind words.

 

I´ll have a go on DELFTship too, these little projects are all about learning, so i will try it as soon as i can.

 

In the meantime i´ll keep playing with Rhino. I will post any progress on this project.

 

Thank you for the help!

 

Greetings

 

Giorgio