Full Version: Ship hull tutorials

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OK, I understand about doing the stern differently. But how can I get a smooth surface rather than separate strips now? I've realised how to make it all a solid though, so at least some progress is made somewhere!

I realise I'm trying to do something too hard for my meagre skill level though!

Thanks

G

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Hi Gord,

> But how can I get a smooth surface rather than separate strips now?

2 things - you need to have smooth curves and you also need to build it as a larger piece instead of just one sub-section at a time.

See here for some description of why:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1398.18
http://moi3d.com/forum/index.php?webtag=MOI&msg=1398.19

Are the curves that were used to construct that in the file? It seems like there are a couple different sets in there.

- Michael

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Hi Gord, and yes this is a pretty difficult area of modeling, no doubt!

- Michael

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Thanks!

I think I need the waterline sections, at least one, to smooth it out. The plan I have to use does not have all the hull lines drawn. I realised a way to do this now.

G

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Ok found an image of what i said previously! ;)

You understand with this system that you can't have sharp form! ;)

All is natural smooth line!

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pict 1 : to be clear ... a boat with few lines ... and 4 networks to do the external hull

the 2 construction lines at the back can be easily modified ( edit point etc ... )

pict 2 : in yellow .... i copy the lines and do a small scale ( scale 3d - boundary box - type .98 ) 98 percents

i need to align the group of yellow lines on the x axe ( in right view ) so later the bastingage will be horizontal

pict 3 : now i have an external and an internal hull - they need to be joined

pict 4 : the most important !! i draw 4 segments to join the hulls ( i zoom very close for each segment ) to prevent gaps

i select the border of each network patch and do JOIN to be sure to obtain a closed curved ( without that ... no solid later )

when i see Closed curved , i can click separate

pict 5 : the 2 hulls are joined correctly ... select all the faces and join ... now it's a solid wich can support holes and various details

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3dm here

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peut etre mieux quand c'est moins pointu-tutu ;)

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some polygonal modelers like 3dsmax have a shell modifier ( with precision & efficiancy )

you can export a nurbs model with impossible shell ( thru OBJ ) and import for example in max ( c4d or blender ?? ... don't know them )

Max will show you holes on the surface of the shell if the nurbs model has not perfectly joined surfaces

if the shell is correct ... reimport in the nurbs software et voilà

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pict 1 : same as precedent stuff ... each patch is verified before network ( join de borders to see Closed curved ) and separate after that
for the 2 missing patches ... select the borders and network
select all the faces and join ... the boat is a solid now

pict 2 : extract the border of the ship and scale ... join ... then rebuild the curve ... extrude and fillet
boolean diff between the ship and the flat piece

pict 3 : fillets and various boolean diff or union etc ...

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@Corchet
...ou en rendu pur fixe dans le Free Simlab Composer Light! ;) https://simlabfr.weebly.com/light.html (here VF)
ou en mouvement dans le vent, la tempête, les embruns, la végétation dans le Free TwinMotion !
(plus tard, là j'ai pas le temps! :(
Semble solide pour affronter la banquise! :)



Can't be floating along the waves...but... :) (of course quality is grandly decreased by the Gif recorder!

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The madness continues!

I have now, I think, have a pretty fair hull, not too many lumps ect. I managed to remove the 'starving horse' effect now. But try as I might, I cannot get the stern to attach. I try to make it from a solid, as suggested, but must be doing something else wrong, as I can't get it to fillet at all.

I chopped off the stern and tried adding a planar panel, but this still won't fully joint up. For some reason I have a crack that I can't close. Pulling my hair out again!!

All this is before I try to get it into a solid...

Sorry for being dense! I come to this as a modelmaker, not a computer wiz!

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i copy your lines ... and zoom ... there is a gap

do as describe .... join the borders of your network to see Closed curve

then separate and network

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You are near the target! Damned Corchet is not spleeping! :)
https://moiscript.weebly.com/uploads/3/9/3/8/3938813/boatm.3dm
Another method!
Make quads with any Cut Trim you want
Verify that all points of Start End curves are in the same x,y,z !!!
So I moved very few "end points" for be on the crossing curves!
You must have a grid of quads!
Sorry for the optic effect of the curves on the right part...look the neighbour shaded view for help eyes!

Here i have just add a curve at the Bottom deck
Some generative curves are created automatically by the Network function!

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another gap here

edit points ... activate objet snap and glue the segments

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Hi Gord, so it looks like those pieces just don't quite align to each other:





There's a gap of about 0.006 units there, that's just a little over the join tolerance. Also there's a really skinny slivery face in that block piece.

To get a piece that will join it would be good to build it directly off of the surface edge instead of from some other curve.

One problem though is that your surface is not trued up to be flat at its end, if I draw in a horizontal line through this point here:



If I then zoom in on the other side over here:



I can see that the surface does not follow that horizontal line, it wanders away from it some:



So before building additional pieces to connect to this surface, it would be good to address that skew and make the surface have a good clean planar end on it.

It's possible to true up the surface by selecting it's end control points and using Transform > Align to line them up so they're nice and straight but it would be even better to look at the curves you used to generate the surface in the first place and make sure that those are trued up from the beginning.

How was the surface created, is it from a Network or Loft? Can you post a file with the curves showing that were used to construct the surface so I can take a look at your curve setup before the surface construction?

- Michael

Image Attachments:
gord_align1.jpg  gord_align2.jpg  gord_not_straight1.jpg  gord_not_straight2.jpg  gord_not_straight3.jpg 

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1st point : your curves has many many points ... apply Rebuild for each of them ... I change the scale of the boat ... and apply 0.05 mm in the Rebuild command

this is VERY important to do that before network or other surface tool

2nd point ; it is not possible to cap the hull with only one piece ... it's necessary to split along the Y axe of the boat

i do the same in my exemple yesterday

3rd point ... when i copy the 2 pieces ( cap of the hull ) to extrude ... they need to be flat ... select the pieces and join them

then go to left axe and use the selection handles around the piece and move one to obtain a flat piece ( it says Flat when you reach 0 in z axe

after that extrusion and boolean diff ... the boat is solid ;)

if filleting is not possible ... select the curves of the bastingage .. ctrl c ctrl v ... draw a profile and use Sweep to build a piece ... something smooth or not

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" You are near the target! Damned Corchet is not spleeping! :)
https://moiscript.weebly.com/uploads/3/9/3/8/3938813/boatm.3dm "

taquin 2.0 ;)
je vais regarder cette page ;)
bonne journée qd même ... lol

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you can also cut the boat with any line ... horizontal or not and then the cap of the boat as only one surface

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@ Corchet ;)

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