Full Version: Ship hull tutorials

From: Gord (NEOMEGA) [#1]
 25 May
To: ALL

Hi again!

Are there any tutorials where they teach you how to build a ship hull, from a lines plan, from scratch please? Not referring to Rhino as some usually do. I know it's possible, just not by me!

I must have missed some basic moves...

I attatch a test file. It has a hull made from an old post that lofts up a dream using the network button. Mine continually fails to loft on network. Going mad as to why!

Thanks

Gordon.

Attachments:
Test hull.3dm

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From: corchet [#2]
 25 May
To: ALL




no rhino reference ! ok !!!!!

you need to trim your curves and verify that you obtain clean part with 4 borders ( example here in yellow )

you need to join segments of curves and build clean borders for your networks

then network are ok

unfortunely some of your curves cannot be trimmed ( small gaps ) zoom and replace point to glue gaps ( with show points )

look at the 2 first patches on the 3dm file joined

Image Attachments:
Test hull test.jpg 

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From: corchet [#3]
 25 May
To: ALL

for rhino ' clients ' ... Alexandre Galin has an excellent tutorial about surfaces on Udemy.com

he shows how to build ........................................................... a complex ship ;)

it can be used by ' MoI-addicts ' too ;)

tuto 7 h 33 ... 12,99 euros

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From: Frenchy Pilou (PILOU) [#4]
 25 May
To: ALL

All "patch" must be well defined!
So general trim between all curves
and verify that
All segments between 2 junctions must be an "alone segment" so Join all multiple segments between Junction!!!

after that all must works fine! ;)

And many time make one by one Network works and not a General Network ;) Mystery of the technic! :)

But seems I was not the more speedy! :)

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From: corchet [#5]
 25 May
To: ALL

;)

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From: Frenchy Pilou (PILOU) [#6]
 25 May
To: ALL

And generally when the calculus is not quasi immediate there is something wrong! :)

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From: Gord (NEOMEGA) [#7]
 25 May
To: ALL

Nothing against it, it's just that they suddenly do something fast that I miss or assume I realise!

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From: Frenchy Pilou (PILOU) [#8]
 25 May
To: ALL

No problem!

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From: pafurijaz [#9]
 25 May
To: ALL

Hi, the network command need a very well coincident curves to avoid any deformation, the best workflow is making hull with the loft command a or with many patch and better curves, here you can see this made now in less than 15 min but I suggest to search for hull design for Rhino in YouTube ,there are many tutorials, and is very hard remaking hull from all the lines in the lines plan maybe, you can try selecting few of them for a better smooth surface otherwise it will be difficult to obtain a smooth surface, you must consider that the precision of the surfaces also depends on your precision in making the sections.

this hull is done with network curves and many blended surfaces and lofting on bottom hull
The lines are in the file

Attachments:
Test hull_edited.3dm

Image Attachments:
Istantanea_2020-05-25_21-15-43.png 

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From: Frenchy Pilou (PILOU) [#10]
 25 May
To: ALL

And you can use this cool Function ! MoveSliceToPoint...if you have yet some documents...
http://moi3d.com/forum/messages.php?webtag=MOI&msg=2749.36
Video https://moiscript.weebly.com/deacuteplacer-des-objets.html
Sorry it's in French but very visual! ;)



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From: Michael Gibson [#11]
 25 May
To: ALL

Hi Gordon, so the reason why Network is not working on your curves there is that your layout does not form a regular grid pattern which Network needs.

Part of a regular grid is that all of the curves in one of the 2 U/V sets should either all be closed or all be open.

In your case you have closed curves here:



And then an open curve here:



So because some are closed and some are open it won't work for all those curves to belong to the same direction set.

With this curve structure you would want it to be configured into pieces like this:





With it set up like that you would be able to use Network for one half of the hull.

However it's going to be messy because there is too large of a gap in this area:





There are some links to some previous discussion threads on ship hulls here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3814.1

- Michael

Image Attachments:
gord_network1.jpg  gord_network2.jpg  gord_network3.jpg  gord_network4.jpg  gord_network5.jpg  gord_network6.jpg 

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From: Gord (NEOMEGA) [#12]
 28 May
To: ALL

Understood. I can now add a network. However, when I then try to join them, the don't always join up, or have holes at the joints.

Basically, I want to turn the thing into a solid so I can add details. I get joined surfaces but that is as far as I get.

Attachments:
Brede 2.3dm

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From: Michael Gibson [#13]
 28 May
To: ALL

Hi Gord, it would probably be good to not try and bend the back part around 90 degrees like you are doing. Have it go straight back and then have a separate planar back end to it instead of trying to incorporate that into one single Network surfacing.

Right now you have a very dramatic shift in a small distance in this area:



That's too many things changing all at once - it's going to make a stressed and lumpy shape particularly in the lower area where it's being compressed down to a small area as well.

You can't get a good quality surface with that kind of high pressure shape changes in a small distance.

- Michael

Image Attachments:
gord_network7.jpg 

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From: Gord (NEOMEGA) [#14]
 31 May 4:29
To: ALL

OK, that works better now, thanks!

My next issue is I want to make it a solid so I can cut into it. The shell command does not seem to like it. I can put a lid and side on it, but it's still just joined surfaces, not a solid. I then need to mirror it into a full hull.

Attachments:
Brede 2.3dm

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