Work flow related question concerning boat hulls

I am designing a boat hull and have created a series of developable surfaces. My question is what comes next in the appropriate workflow of this process?

  1. Do you extrude the developable surface to make a solid(5 mm plate)? (I tried this but it seemed to break the developable surface)
  2. Do you create 6 surfaces and join them together making the 5mm plate?
  3. Do you copy and paste the surface and extrude one surface and lay the other on top of the extruded surface?

I am asking because it would be nice to flatten these plates and nest them for water jet cutting. What is the most appropriate work flow for this process.

I guess I am asking “when I look at videos of engineers using Rhino to design AL boats on YouTube what am I actually looking at, surfaces, solids, or a combination of the two?”

There are tons of articles and videos on how to do specific steps but not so many overall work flow videos.

Thank You

Welcome to the forum. :slightly_smiling_face:

The unrolled shape is determined by unroll a surface using UnrollSrf or UnrollSrfUV, not a solid.
The Explode option in UnrollSrf controls whether a polysurface is exploded when unrolled.

The plates with thickness can be modeled using OffsetSrf. If Solid=Yes in OffsetSrf then closed solid objects will be formed. Rhinoceros Help

Unless the plate is flat don’t use extrude because the thickness will vary depending on which way the local surface normal is pointing.


Are you new to Rhino or have you done other modeling in Rhino?

Do you have experience designing boats?

Are you interested in learning about designing boat in Rhino in general, or is your goal to design one boat?

Thank You David for your reply, I am especially thankful for your posts on creating developable surfaces. Your posts are all google searchable and I am very sure that you assist many more then you know.

I am a high school STEM teacher currently stuck with with online learning, I have 3 hours a day of online teaching and the rest of the time free. Learning Rhino has been a fantastic use of my free time and will consider introducing it in my classroom after achieving a certain level or personal proficiency. I live in a small fishing village in the gulf of Thailand and want to build a small simple skiff to explore the salt marches around me.

Experiment I will !

small skiff.3dm (198.6 KB)

Do you know why my curvature analysis only makes the panel black? No matter how I play with the ranges all I see is black.

1 Like

Hi -

Please post that 3dm file and the output of the Rhino SystemInfo command.

skiff 4.5 meters.3dm (882.9 KB)
systeminfo.txt (2.0 KB)

Hi -

Thank you for that information.

Standard graphics configuration.
Primary display and OpenGL: Intel(R) HD Graphics P4600/P4700 (Intel) Memory: 1GB, Driver date: 10-16-2017 (M-D-Y). OpenGL Ver: 4.3.0 - Build
Integrated graphics device with 3 adapter port(s)
- Windows Main Display attached to adapter port #0

Note that the minimum recommended VRAM for Rhino 7 is 4GB. Your drivers are very old - you could try updating them to the latest versions to see if that helps. The Rhino Notifications panel should have links to the Intel website.