“Intersect two layer” in v2.6

[David]

I’m new to Delft and I’ve been working on a model where I would like to have the transom be curved and intersect with a ‘gull-wing” type hull. I need to maintain developable surfaces throughout and I’m having trouble understanding how to achieve this. The attached JPGS show the model i’m working on. I’ve drawn the transom curved as I would like to see it and currently have it extending below the plan of the hull. I can’t seem to form an edge (and need points) at that junction. I keep trying to use the function “Intersect Two Layers” (under the point pull down menu) but it doesn’t seem to bring those layers together. Is there a better way to achieve this in V2.6? Is there some step I need to do after using the “Intersect Two Layers” function in order to complete my task?

In addition to the JPGS I’ll also attach the FBM file in case that helps.

Cheers, Dave

Attachments:

• Capture1.JPG
• Capture2.JPG
• Newmodelcurvedtransomguide.fbm

[Schuchardt]

Hi Dave,

I had a look at your file. My suggestions are:

In your model, the inner part of the bottom and the transom are in one layer. Transfer the inner part of the bottom to a separate layer (lets name it ‘hull inner’).

Next, apply the function ‘subdivide controlnet’ two or three times. The crucial point is, that intersection points are inserted in edges only. If you have only few edges, no or very few intersection points are found, and these points ar too far away from the real hull surface (remember, that in subdivision modelling the edges do not lie on the surface). In this case you will get garbage. But the more edges you have, the tighter the control net will become, and it will represent the actual surface increasingly better. Therefore, you have to subdividethe net.

Finally, intersect ‘hull inner’ and ‘hull outer’ with ‘transom’ each and insert new points in ‘transom’.

Perhaps this could be the way to solve your problem, as I understand it.

Regards
Klaus

[David]

Klaus, Thanks You!!! I’m getting somewhere with your instructions. I’m not out of the woods, yet… One problem is v2.6 does not seem to have the function “sub-divide control net”. So for now, I’m practicing in v4.4. I’ve been creasing the edges after I intersect the layers, which I assume is a necessary step, and it usually makes some of the hull ‘red’. If I understand your discussion, sub-dividing the the control net more and more should keep reducing this problem. That’s what I’m playing with right know. It is amazing see things come together on the screen.

Tschüs, Dave

Attachments:

• Capture3.JPG

[David]

It’s coming along! Is there a way to make the new edge one long continuous edge? It seem to be made up of many short edges over top of each other (maybe that is a result of my clipping and trimming job). I assume because of this new discontinuous edge I have many more leek points (~84). Should I care about the leek points?

Attachments:

• Capture4.JPG
• Capture5.JPG

[David]

Yes, I think it is an improvement when I use even more control points. And it’s not crashing my computer, yet. I’m hoping that this amount of red will not effect the final cut.

Of coarse I still have to find a way to save in as an older version (v2.6). Version 4.4 (Free Ship) doesn’t give me that option.

Attachments:

• Capture7.JPG
• Capture6.JPG

[Schuchardt]

Hi Dave,

congratulations, I think you’ve got it. And all leak points are gone, did they?

As far as I know (Mr. Admin will know better) it is not possible to import a DS file to FreeShip. I suggest, that you produce a body-, sheer- and lines-plan in your current DS implementation, then use these plans as backgrounds in your FS software and remodel your ship with much less points.

Regards
Klaus

[David]

Thing are coming along! I haven’t been able to clean up the leak points though. When I zoom way in, and I look at the new edge it is made up of two separate edges. Each of these edges are connected to alternating points along the line between the transom and hull. I assume this explains the 310 leak points in my most detailed model. Can I merge these two edges? I think that would end my challenges.

Thanks again, Dave

Attachments:

• intersectinglayerspratice.fbm

[Schuchardt]

Hi Dave,

its not easy to merge both these edges, but I have used your last model data base and tried the following way (see attachment):

I have moved the inner and outer hull by 0.1 in the negative z-direction to separate their edges from the transom. Then I have defined a new surface between opposed points of the hull layer and the transom layer. If you do this for all leak points, the space between the edges will be closed and the leak points will thereby be killed. Finally, the inner and outer hull will have to be moved back by 0.1 in the z-direction.

This solution isn’t smart at all and involves tedious work, but it is straightforward and i think it will work at least.

Interesting problem, interesting discussion.

Regards
Klaus

Attachments:

• getridoftheleakpoints.PNG

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