Lines Plan from Hull

[KRL]

What is the easiest, cheapest and fasted method to obtain a lines plan from a 12 metre hull? Has anyone had some experience with this?

[peter radclyffe]

the quickest is a scanner, the cheapest may be to measure it with, laser, level, tape measure,patterns which is how i measured my avatar Lulworth

[zeroname]

1.Draw lines plan in autocad from the offset table of the hull. if you want have any offset table, do the peter method.

[yipster]

good advice, with a camera and software you can transfer to 3d cad meshes
when you want a dozen a week it may be easiest, cheapest and fasted
i've seen ships and cars done very accurate, here a free blender sample

[PAR]

If using a camera, you have to compensate for lens distortion, which isn't as easy as it might seem. Even a digital camera sees the world through a lens, before the image is converted to a digital format.

[yipster]

thrue and i havent try'd this out but way back Stepan Ditmore had allready some links to more expensive cameras
and software that not only crearted a mesh but even calculated displacement of a ship and such things

i've seen it proffesionaly used on cars and thought i be wise never to draw a car
( or anything else existing ) in 3d again, really astonishing results that can kill a cad artists

yes camera lenses give distortion yet when you walk or fly all around the object taking multiple pics
the free blender vodoo plugin takes averages from various angles

not less exact or elaboures most common gettin lines from hull method method attached

[Joe Petrich]

We have large hulls and molds so we use a laser scanning service when we need it. Very expensive though.

For smaller projects we use Rhinophoto, a photogrammetry plug in for Rhino. It is significantly cheaper (around $1,000, or 1/3 that for students). You must have Rhino though. It works quite well. You need a good digital camera (SLR preferred) which is calibrated using the program. We were skeptical at first but have found the program to be worth the money. There is even a hull digitizing video on their home page.

The least expensive, but most labor intensive method is to do it manually by laying out a grid on the floor beneath the boat and on the boat itself and taking offsets by tape measure, etc as Peter said.

[yipster]

Originally Posted by KRL

What is the easiest, cheapest and fasted method to obtain a lines plan from a 12 metre hull? Has anyone had some experience with this?

you must have felt this comming did you not ?

[JosephT]

Depends on how precise of a match you want. With the hassles of manually tracing & costs of scanning, some good photos of the boat (profile, top, bow, stern) will work fine using yipster's suggestion. If you can mark the stations on the hull with a black grease pencil, this will help when refining the curves to match existing stations as closely as possible. Using this approach I can replicate an existing hull very closely using DelftShip/FreeShip.

[KRL]

Well i must say thanks for the various methods mensioned!! Very helpful

[ACuttle]

I used to work for a company that did hull laser-scans.

There's some more information on their work here:
http://www.djaweb.co.uk/index.php/pr.../vessel-survey

It can seem an expensive way to go but can be very accurate and gives you a point cloud/surface to go back to should you want further information on an area. Depending on how you want things it might be cost effective as you'll be getting lines straight into the computer and with less margin for human error.

[dskira]

Originally Posted by KRL

What is the easiest, cheapest and fasted method to obtain a lines plan from a 12 metre hull? Has anyone had some experience with this?

Why you want to that?