Skinning my Boat?  1-20  21-38

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 From:  Brian (BWTR)
1264.1 
I seem to be having a problem skinning this boat shape.
Help/suggestions welcome please.
Note I actually have a clean mirror rather than the poor one shown.

EDITED: 27 Sep 2008 by BWTR

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 From:  Michael Gibson
1264.2 In reply to 1264.1 
Hi Brian, I would probably try using a sweep with the stations as the profiles and the 2 upper curves as the sweep rails.

Do you want to post the .3dm file with your curves? That would make it easier for me to give more specific advice.

- Michael
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 From:  Brian (BWTR)
1264.3 In reply to 1264.2 
Thanks Michael. Here is the file.

EDITED: 27 Sep 2008 by BWTR

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 From:  Michael Gibson
1264.4 In reply to 1264.3 
Hi Brian, here is one method.

First of all a bit of curve re-arranging. The third rib back from the front is in 2 pieces:



Select those 2 pieces and use Edit/Join to make them into one single curve. Then take the long central curve:



And split it into 2 pieces using the back-most rib as a cutter. To do this, select the long piece, run Edit/Trim, select the back-most rib and right-click, then at the point where the prompt is asking you for which pieces to discard, right-click or press Done there to keep all the pieces. That will leave you with this small piece:



Now you can select these ribs:



And construct a surface there by doing Construct / Sweep, and select the 2 longer curves as the rails. For the back one way is to select these 3 curves:



And then do Construct / Network. Then I mirrored those pieces over:



You'll see that the boat is a little lumpy - you may need to edit some of the profile ribs to kind of change in a sort of more gradual manner to reduce lumps.

I also turned on control points and edited the tip where the 2 long pieces come togehter so that they all came to a common point, right now they are a little separated there.

There are some other ways that you could approach it too - one that may be interesting is to focus just on the ribs and not the longer rails at all, and then you can do a Loft through those using the "Loose" option which doesn't tend to make as bumpy or wiggly shapes.

Hope this helps!

- Michael

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 From:  Brian (BWTR)
1264.5 In reply to 1264.4 
Thank you very much Michael. I had fixed the first problem but would never have though of the rest of the solutions.
It will all help working methods when I get to the stage of doing the real boat I want to model.
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 From:  Brian (BWTR)
1264.6 In reply to 1264.5 
I had rather a good day! Thanks Michaell

EDITED: 22 Nov 2008 by BWTR

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 From:  Michael Gibson
1264.7 In reply to 1264.6 
You're welcome - that looks like it is coming together well now!

- Michael
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 From:  Brian (BWTR)
1264.8 In reply to 1264.7 
This is the state of play at the moment.

I can not stess how appreciative I am of the Incremental Save. It is so much more creditable to use that occasionaly than to go back through an Undo exercise.
Thouigh, saying that, it is less necessary probably with MoI because it never sems to jag,freeze, dissapear. (Can MoI be "b--------d up" to use the thought we all use?)

EDITED: 31 Dec 2008 by BWTR

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 From:  Brian (BWTR)
1264.9 In reply to 1264.8 
Had to get out of bed at 3am this morning and start a rework, from scratch. Here is the state of play at noon today.
Not a single, jamb or crash despite all my "wrong" moves. Amazing!

EDITED: 31 Dec 2008 by BWTR

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 From:  Michael Gibson
1264.10 In reply to 1264.9 
Hi Brian, it's coming together great!

It seems to be matching the shape of your plan drawings quite well.


> Not a single, jamb or crash despite all my "wrong" moves. Amazing!

Fantastic!

- Michael
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 From:  Brian (BWTR)
1264.11 In reply to 1264.10 
Have a problem though.
How do I skin/extrude this shape?
Everything similar has worked fine before!

EDITED: 31 Dec 2008 by BWTR

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 From:  Michael Gibson
1264.12 In reply to 1264.11 
Hi Brian - that shape has a kind of twisted frame, it is not a flat planar shape, so that's why it is a little different for extruding.

MoI will pick an extrusion direction of straight up in z in this instance (when the input curves are not planar), which in this case doesn't give you a good result. Nothing is actually generated because it would be all messed up. But you can click the "Set dir" button inside of Extrude and then click 2 points to give it an extrusion direction going in the x-axis direction, then that will punch out an extrude, but only the side parts of the extrude will be created, it won't be capped off automatically because that capping only happens with planar shapes.

To build the cap in this case, you can use Edit/Separate to break the curve into pieces. There are 2 pieces on one side, join those together so you have 4 curves, and then with 4 curves around in a ring like this, you can use Construct/Network to surface it. You can also use sweep with 2 profiles and the other 2 as rails.

Then you can make a copy of that cap on the other end of the extrude and use Edit/Join to join them together into a solid if that's what you wanted to make there.

I think I might be able to tune up the automatic extrude direction in the future, for this case of a non-planar curve. Instead of choosing the world z axis direction in this case it seems like it would be better to try and look at the shape and see if it is close to planar in some direction and then use the world axis direction that is closest to that direction instead of always z. But I won't be able to put that in for the v1 release though.

- Michael
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 From:  Brian (BWTR)
1264.13 In reply to 1264.12 
Tyhanks Michael.
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 From:  Brian (BWTR)
1264.14 In reply to 1264.13 
I think I had a pretty good day!
Thanks Michael.

EDITED: 31 Dec 2008 by BWTR

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 From:  Michael Gibson
1264.15 In reply to 1264.14 
It's really coming to life!

Are you getting more comfortable with using MoI after spending time on this project?

- Michael
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 From:  Frenchy Pilou (PILOU)
1264.16 
added to the Special Thread Gallery :)
---
Pilou
Is beautiful that please without concept!
My Gallery
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 From:  Brian (BWTR)
1264.17 In reply to 1264.15 
Michael---YES!
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 From:  Mark Brown (MABROWN)
1264.18 In reply to 1264.17 
Great work. What a cool little boat. I wouldn't mind one of those myself.

Mark
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 From:  Brian (BWTR)
1264.19 In reply to 1264.18 
Mark.
It's the H28 design by Hereschoff who designed many of the early Americas Cup boats and many other famous ones.
Some 6 where built in backyards here in South Australian in the 1940s, and they are still alive and well. Even more in Western Australia I believe.
I spent many happy years sailing in one.
Brian
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 From:  Mark Brown (MABROWN)
1264.20 In reply to 1264.19 
Hi Brian,

It is a small world, I'm in Adelaide myself. Sadly I can't sail but would love a yacht of my own one day. It's nice to dream...

Are you going to rig your model?

Mark
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