Boat Hull Sweep or Network

Hello All,

I am trying to make a 3d representation of a boat hull from a side profile drawing & separate hull cross sections.

I scaled everything how I wanted and traced cross sections and outline. I assumed I would use a NetworkSrf to accomplish this, but can never seem to select the appropriate curves in the right sequence.

I have seen the other “hull” posts on the forum, and unfortunately am still lost. How should I approach this?
seabright_hull_help.3dm (4.6 MB)

What’s your goal?

There’s a lot of art to producing a really fair surface. There are also a good number of videos on youtube, keywords rhino create hull, such as
(25) Creating hull surface of ship from lines plan using rhino7 Tutorial - YouTube
which uses Rhino’s network surface tool to drape a surface over a set of curves.

For running calcs on the resulting hull, which is a much less demanding requirement than producing top end renders, I’ve been creating a GHS (text format) file with a little stations-and-offsets conversion program- could also be done with a spreadsheet and some macros- and importing that into Rhino, which automatically converts it into a mesh if you want. The volumetric properties agree well between the station-defined version, the tri patch version in Rhino, and an independent tri-patch calc on the result.

Attached is a screenshot of a sample result if an import of stations in the text file, which is click and done. (this was from a set of station definitions in a PDF, OCR’d and then checked briefly but not completely)

Thanks. Not looking for top end renders, just a simple mesh at the end. The quality of your perspective preview seems about what I am looking for. I would love to try your file out if you can share.

I will have to look more on YouTube. There is a lot going on in that example video.

Sure. This ship doesn’t exist. It’s a hypothetical destroyer that was a student project.

It does have quite a few stations to get that level of detail.

The Rhino file and the .gf (GHS format) file.

If you want to try that path, I should also give you some help with the gf file format: it’s easy to write but very hard for a human to read because there are no visual breaks between successive stations.
rhino-version.3dm (138.8 KB) (20.7 KB)

check this fantasic topic:

Thanks, I saw that. It does illustrate the differences, but I don’t see an explanation of how they arrived at the surfaces.

Hi Nial - there is not nearly enough info in those few curves to generate a hull - it is much, much more complcated than that. See


I have gotten NetworkSrf to work and am refining the surface result.

“Study plans” of boats will sometimes be distorted to make it difficult to use the information in the plans to create a 3D model.

Haha, I have found that to be true, but through some inferences I have a 3D model that is representational and fit for my purpose.

Edit: meant to reply