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Full Version: Ship hull tutorials

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From: corchet
2 Jun 2020   [#41] In reply to [#40]
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
From: corchet
2 Jun 2020   [#42] In reply to [#41]












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 ...
From: Frenchy Pilou (PILOU)
2 Jun 2020   [#43]
@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!

From: Gord (NEOMEGA)
2 Jun 2020   [#44] In reply to [#31]
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!
From: corchet
2 Jun 2020   [#45] In reply to [#44]



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
From: Frenchy Pilou (PILOU)
2 Jun 2020   [#46] In reply to [#44]
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!



From: corchet
2 Jun 2020   [#47] In reply to [#45]



another gap here

edit points ... activate objet snap and glue the segments
From: Michael Gibson
2 Jun 2020   [#48] In reply to [#44]
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 


From: corchet
3 Jun 2020   [#49]















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
From: corchet
3 Jun 2020   [#50] In reply to [#46]
" 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
From: corchet
3 Jun 2020   [#51]



you can also cut the boat with any line ... horizontal or not and then the cap of the boat as only one surface
From: Frenchy Pilou (PILOU)
3 Jun 2020   [#52] In reply to [#51]
@ Corchet ;)




From: Gord (NEOMEGA)
3 Jun 2020   [#53] In reply to [#47]
So nearly there! But is it possible to 'glue' the crack in the stern somehow? Or patch it over? This part gets removed when it is made a solid. Or can the panels be closed somehow?

Thanks for all your help guys!

G
From: Gord (NEOMEGA)
3 Jun 2020   [#54] In reply to [#48]
Frames as requested Michael. It was network. They seem to become distorted for some reason.

Thanks

G
From: corchet
3 Jun 2020   [#55] In reply to [#52]
@ Pilou ;)






la nouvelle " croisière ne s'amuse plus ! " ... 3 rangs de rameurs pour faire avancer la barquasse ! ;)

seules les 1ères classes peuvent faire du toboggan sur le pont ...
From: Frenchy Pilou (PILOU)
3 Jun 2020   [#56]
@Corchet! Excellent! :)

@ Gord

Make a shortCut with that!

script: /* Naked edges */ var gd = moi.geometryDatabase; gd.deselectAll(); var breps =gd.getObjects().getBreps(); for ( var i = 0; i < breps.length; ++i ) breps.item(i).getNakedEdges().setProperty( 'selected', true );

As long as you have enleighted something there is something wrong and you will not have a Solid!!!

I believe you must redraw over your existing curves as base! So lock existing !
Draw only one curve on each side of "quad" (no need to draw a second new curve on commun "edges" )

Make a Network one by one "quad" or Loft or Sweep depending of curves

Generally it's more speedy than repear to infinite!
From: corchet
3 Jun 2020   [#57]
9819.53 In reply to 9819.47
So nearly there! But is it possible to 'glue' the crack in the stern somehow? Or patch it over? This part gets removed when it is made a solid. Or can the panels be closed somehow?

Thanks for all your help guys!

G
Attachments:
AttachmentBrede 2 3rd try.3dm

i look at your model

same problem






zoom closer as possible you'll see a gap
when i select the 2 parts of the curve and click Join ... it should be glue the 2 parts and make only 1 curve

try to fix that first
and post the result
to glue that you need to select Object snap

second problem you have an incredible number of points on your curves








select the curves
press Tab
and write Rebuild where the screen becomes blue
at the right of the screen you'll see a panel with Refit and a number click done and

and post the result here
From: corchet
3 Jun 2020   [#58] In reply to [#57]
when you fix that you should see

one curve ( joined ) with few points

that's what you need to reach





From: Gord (NEOMEGA)
3 Jun 2020   [#59] In reply to [#58]
Thanks! I think I cured that gap by manipulating the surface points slightly. Nothing shows when Naked Edges is run. However, try as I might, I still cannot get it to mirror and boolean together as a solid. I planared the top face, it joined OK, but still won't boolean together for some reason.

I think this will be the last boat I'm doing...
From: Michael Gibson
3 Jun 2020   [#60] In reply to [#54]
Hi Gord,

re:
> Frames as requested Michael. It was network. They seem to become distorted for some reason.

Thanks for posting the curves!

So the first thing I see is that various curves do not have their endpoints touching on to the curve going in the other direction.

The first spot I checked was here:


And zooming in you can see the section's endpoint does not touch the rail curve going in the other direction:


Similarly here and in most other places:



So that's a big reason why your surface wobbles around a bit instead of being planar at its end. It would be good to tighten up the accuracy of your curves before you generate surfaces.

It is possible to true up the surface afterwards too though. To do that turn on surface control points, select the last row or column of points and use Transform > Align to get them all in a straight line in a side view. Do that before trying to construct additional pieces that should join to this surface.

- Michael


- Michael

Image Attachments:
gord_curves1.jpg  gord_curves2.jpg  gord_curves3.jpg  gord_curves4.jpg 


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