i guess i am lacking soomething big trick in this hull,to produce it correct as real hull photo
My big question throughout this discussion has been: What is your starting point?
Rhino users tend to fall into to broad groups:
- Those that work off of plans
- Those that work freehand
When I do ship hulls (off of plans) I usually have a table of offsets that specifies the shape of the hull as a point cloud.
Actually my is not free hand doing.
I just have general arrangement as blue print input and I want to produce the required hull by watching either photo of existing hull from internet and meanwhile do not deviate from initial blue print(that is GA plan) and in current case I don’t have offset table of hull
Published GA drawings and similar, even lines drawings, are sometimes subtly distorted to make it difficult to use the published information to recreate the boat shape.
2 Likes
That’s true I guess too.
When I try my modelling by thinking to should not deviate from GA, in current hull design case, it always create not correct hull design.
Lot of times I doubted myself that may be I didn’t read correct GA curves, but later realized that I read them right.
And probably GA is wrong, or I don’t know what exactly problem is.
When I tried making this hull, at last the GA blueprint I found not making my hull design as correct and similar as real hull design on internet.
But I don’t know davidcockey whats other way, if I only have GA as input which I guess is 100% correct or not, I can’t say (according to my level of experience).
Than what should be procedure according to you to produce hull, should I just try with free hand to reach near real hull model level(and free hand style of modelling to produce correct existing hull shape is more time consuming and tedious I guess)
I would start with the GA, create curves which “match” the curves in the GA.
Then think about how to arrange surfaces for a surface model. Decide the order to create the surface.
Start creating surfaces using the GA curves where they help. Modify the surface if needed to better match what you think the shape needs to be.
The knowledge of experience is obtained by doing. Experiment and study the results of the experiments.
1 Like
I suggest, for each view:
-
draw lines for the known dimension in the view. If the length is 65’, draw two parallel lines 65’ apart.
-
On another layer, use the PICTURE command to import an image for the view.
-
Disable grid snaps and move the picture to that one of your lines is correctly aligned with its position in the image.
-
Use the SCALE command to resize the image so that both lines are aligned with their position on the image.
-
Trace the curves in the view using drawing commands (spline, line, arc, etc.)
-=-=–
In cases where a curve is not planar in your model, create two views and draw the curve. Then extrude the two curves and intersect to create a 3D curve.
1 Like
Yes David, I believe this is the correct way which you telling, I had followed the same way, but in the end, I am unable to produce correct hull design.
This hull a person has to try to understand the complexity of this hull, the blue prints(GA) if I follow it makes hull almost 80℅ correct, than I did playing with control point, than it get near to real hull almost 88%, but still 12% I am far from real hull.
If I follow GA along with playing with control point at later stage, it just not reaching 100% near to real hull design.
Especially all things I can produce correct but nose of hull doesn’t come correct( it deviate everytime from real hull design).
I have tried your way of procedure already, but it does not giving 100℅ correct real hull shape.
This hull I believe until a person will not try by himself won’t able to face issue what I face.
Ever reaching only 88% near to real hull design, it just something which is hard to explain, only possible when person try to create by himself.
1 Like
Hi Mack, What is a GA? This where I first see it? Also If you want to share the hull info to draw, I would like to give it a try. I good challenge I would guess.—Mark
Thanks mark, it’s GA(General Arrangement) which I have basic blue prints (Curves) to model hull.
I would share you in some hours the design, my lappy is off, so let’s upload it by some hours as I open lappy.
You can only get 100% correct hull shape with 100% correct data to start with. Maybe ask the manufacturer for a table of offsets.
With naval subjects, the data is usually rounded to the closest 1/16" so, if you take the data literally, you get steps rather than curves. On has to draw their own curves within the limits of that precision.
1 Like
This an interesting discussion!
I tried to imitate the shape of the ZEELANDER yacht for 3D modeling, and today I finished the initial shape of the hull, and will continue to complete and add relevant details later.
2 Likes
we dont need 100% accuracy but atleast the shape and the basic dimesion should be followed that is what the task is, on which i am miserably failed
Hello Simon…the produced design looks cool,what input did you take to prduce this hull?(GA ?)and lets wait to see your fully developed model
Mulder Favorite 1500 - A2 -Layout.pdf (174.4 KB)
Mulder1500 Favorite (2) 001.3dm (879.0 KB)
Here is for everyone who want to try this hull and have guts to finish it correctly.
I am sending you attached a General Arrangement and the 3d model of the underwater hull regarding a project called Mulder 1500.
The idea is that you can provide us a 3d model of the hull.
1 Like
oh boy, there it goes my weekend
I think we should turn this in a fun challenge
the winner gets bragging rights
1 Like
Hahahha… That’s good idea
Such a pretty boat. Attached is another method (saved as V6). This is preliminary and areas will need adjustment and refinement (and time) before reaching a final shape. Your hull bottom is present Mack, but I haven’t altered it, I just used it for reference. Included are the topside construction layers.
Mulder Topside Prelim.3dm (3.8 MB)
2 Likes
Looks very professional neat & clean hull, quite similar,since two days quite busy with travel, would love to see tomorrow in my lappy your hull more closely,as I will be back to my flat.
And as with photo I don’t see fore side, especially nose of hull, where I ever had wrong results.
Let’s me see it tomorrow.
Good luck trying Brian