How can I create a smooth boat hull tip like the AquaRiva one?

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 From:  simba
6639.1 
Hello,

I tried to create a boat hull using loft bur I keep running into problems at the boat tip. Well, there's the tutorial video for the AquaRiva by Andrei Samardac but unfortunately he doesn't go into enough detail about the basic hull design process and I am not able to achieve something similar. How can I get the loft curves to close smoothly?





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 From:  Michael Gibson
6639.2 In reply to 6639.1 
Hi simba, the best way to get a smooth closed end with loft is to use the option Loft style = "Loose" inside the Loft command and also include a point object that is in the same plane as the end profile.

I've attached an example 3DM model file here - when opening the file notice how there is a point object at either end, that will be the closing point. Also notice that the point object is in the same plane as the first or last profile curve as well.

Then to do the loft, select everything and run Construct > Loft, and change Loft style to "Loose":



The "Loose" loft style makes a more relaxed surface which follows the general shape of the profile curves but does not force the surface to go exactly through them, it works well for making smoother shapes particularly ones with smooth closed ends when used with a point object for the final start or end position. You create point objects under Draw curve > More > Point. To make a smooth end put the point object in the same plane as the last profile curve before the end, that will make the surface be tangent to that same plane in the loose loft result.

Some other examples of loft to a smooth closed end here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=6082.10
http://moi3d.com/forum/index.php?webtag=MOI&msg=6082.8

In the attached file you'll get a result like this:




- Michael

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 From:  Andrei Samardac
6639.3 
Hi Simba, this is video where I made Acva riva and you can see how I made hull: http://youtu.be/WaCFQOaTjTQ
Also this is thread where you can see model and other stuff: http://moi3d.com/forum/index.php?webtag=MOI&msg=6236.1
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 From:  Barry-H
6639.4 In reply to 6639.1 
Hi Simba
I have had a look at your drawing and found most of your curves have 5 points but some more.
Also the blend line produced by these curves along the length of the hull was a little wavy.
I have rebuilt your cross sections using the straight lines and blending them and then did a loose loft.
I also came across this video that may help
http://www.youtube.com/watch?v=hgjxO5yuRxg&list=PLNR63yhSxBmTXrOFDRnorMkDj_lKf1_3L
If I remember right you posted a similar problem with a catamaran hull so I attempted
to do it based on the Youtube video which I have added to the attached drawing.
Hope this is of some use.
Barry
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