deck structures

DELFTship forum Hull modeling deck structures

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    • #35833
      adriano natalini
      Participant

      Hi there,
      am about to model a cockpit from a cylinder by inserting it into the deck.
      Got a deck with 4,5% crown with 6 faces.
      Tried many ways and times but after intersecting only missplaced intersection lines on the portside is the result.
      Does anybody know what could be the reason?
      Here some pictures to better explain.
      Many thanks for any suggestions
      Adriano 🙂

    • #35837
      adriano natalini
      Participant

      Well I fond out that by subdividing the control net a couple of times I get enough control points needed for the intersection.
      The question now is, after intersecting the two layers, how to go back to normal control net?
      I really would very much appreciate any small help. thanks
      Adriano 🙂

    • #35838
      Hrvoje
      Participant

      I am avoiding to subdivide control net. After saving the project and closing it all “undo” possibilities are lost. I did that once, and when I realized that I don’t need so many control points, the only way (I believe) to get rid of unnecessary edges and points was to collapse them. After edges I collapsed control points too. You will see what to collapse first, its intuitive.

      Kind regards,

    • #35847
      Hrvoje
      Participant

      Adriano, you can use Gaussian shading to see surface curvature. I use this tool a lot.

      Cockpit001.jpg

      On upper picture is possible to see some irregularity of surface. To get rid of this do following:

      1. Split upper and lower edge.

      Cockpit002.jpg

      2. Connect new points with edges.

      Cockpit003.jpg

      3. Have a look after Gaussian shading.

      Cockpit004.jpg

      4. Internal edges are not yet as good as wanted, because of an orphan control point. 🙂

      Cockpit013.jpg

      5. Let’s add on each vertical edge one new point at the same height as “orphan” point.

      Cockpit010.jpg

      6. Let’s connect all these new points with a new edges.

      Cockpit011.jpg

      7. Let’s have a look

      Cockpit012.jpg

      Next activities will be in accordance with our pleasure with new situation.

      Kind regards,

    • #35849
      Hrvoje
      Participant

      The colour of the surface tells if the surface is flat (green), convex (red) or concave (blue)

      Cockpit014.jpg
      .

      Kind regards,

    • #35853
      adriano natalini
      Participant

      Thanks a lot Didda for the detailed explanations which are very helpful.
      I solved that problem with the cylinder but I am unable to fix the twisted mesh on deck which seems to be more serious. I tried to insert new points and lines but the problem is getting worser. :sick:
      It would be very helpful if Martijn could release a video showing how to master this basic problem which we encounter any time any where and/or “subdividing controlnet” tool should be taken into consideration and how 🙂
      It’s a very hard way to learn this nice software but mainly to rely on very few forum members’ generosity, like you, it’s a very hard job!
      Thanks Dida for all yr efforts to help! 🙂
      Adriano

      Attachments:
    • #35854
      Hrvoje
      Participant

      Hi, Adriano!

      Try to obtain equal number of points in longitudinal direction on the deck and on the hull. Let transverse edges on the deck and hull match each other. It is the same for the area of the cockpit and the quarterdeck.
      The boat looks very nice. 🙂

      Kind regards,

    • #35859
      adriano natalini
      Participant

      Thanks a lot Dida,
      I did try to insert additional longitudinal edges on deck at the cockpit area but apparently it’s not helping.
      Even the new intersected cockpit curved edge (as shown on the picture) at deck level on the portside is not properly modeled. The program somehow doesn’t detect all the way around the new deck inserted edge .
      Somehow it looks more difficult than inserting a curved transom! It’s really frustrating.
      I may do something wrong, I believe, but do not know how to go ahead?! :sick:
      Well … even if you’re the only “saint” at moment around I may have exhausted the limit of yr patience on this issue?! I guess 🙁
      Thanks
      Adriano 🙂

    • #35861
      adriano natalini
      Participant

      Good morning Dida,
      Yes, I think the only and best way to overcome such problem is to insert new edges longitudanally all the way on deck and vertically on the cockpit wall. The picture now looks much more pleasant! Thanks.
      Another small problem which I cannot find out a solution is following:
      Due to some reasons I couldn’t extrude the bulwark in one go but at two stages.
      Now I have the main bulwark, in the middle, divided by two control red edges into two pieces.
      Do you know how I can merge the two existing edges together to model the bulwark in one piece?
      This is problem which we can be faced again at different stages
      I would appreciate yr kind help whenever you have some spare time 🙂
      Of course anybody else’s comments/contribution would be very wellcome! 🙂
      Adriano
      PS
      The external railcap corner is not turning into a desired curve as the internal one, I’ll have to work on it

    • #35862
      Hrvoje
      Participant

      Hi Adriano!
      Try to collapse the edge you don’t like. After that you will have a hole in the plating. Than add new face to close this hole. If you don’t like the result click “undo” button and try with the other edge. If the hole is not closed as you want, try to experiment by selecting the control points in different order.

      In the Download area under Tutorials you will find “Leak points”. In this tutorial you will see how to get rid of unwanted edges (between other things).

      Have a fun!
      🙂

      Kind regards,

    • #35863
      Hrvoje
      Participant

      …The external railcap corner is not turning into a desired curve as the internal one, I’ll have to work on it

      Did you try to make this point non crease? Just uncheck “Corner” box. 🙂

      Kind regards,

    • #35867
      adriano natalini
      Participant

      Hi Dida
      I did use the corner box but it worked only strangewise for the internal edge
      I used crease edge from the tool bar and now the external edge has been bevelled as well.
      Thanks
      Adriano

    • #35870
      Hrvoje
      Participant

      Adriano, is selected mesh (yellow) what you want to move to the hull layer?

      Cockpit018.jpg

      Kind regards,

    • #35874
      adriano natalini
      Participant

      Hi Dida,
      I think I did missinterpretate yr last instruction since I was mentioning about two different problems.
      Yes, the lighted up section is the extention of the main bulwark which I would like to merge together.
      At monent these are two separate parts, divided in the middle by two control adges.
      Thanks
      Adriano 🙂

    • #35877
      Hrvoje
      Participant

      If you want to move selected face to the other layer select layer in which you want to move it.

      Cockpit019.jpg

      Cockpit020.jpg

      Kind regards,

    • #35878
      adriano natalini
      Participant

      Thanks Dida,
      I’ll go through that and see how I can get the two pieces into one.
      Adriano 🙂

    • #35879
      adriano natalini
      Participant

      Thanks Dida,
      I’ll go through that and see how I can get the two parts into one.
      Adriano 🙂

    • #35895
      Hrvoje
      Participant

      As I can see, and maybe understand 😉 , you have the problem on this location:

      TwoParts001.jpg

      and you want to have something like this?

      TwoParts006.jpg

      If so, then add new face between those three points from upper picture.

      TwoParts002.jpg

      Then add again one new face between three selected points

      TwoParts004.jpg

      TwoParts005.jpg

      delete selected edge

      TwoParts011.jpg

      collapse selected point

      TwoParts010.jpg

      delete edge:

      TwoParts009.jpg

      collapse point:

      TwoParts008.jpg

      insert new face:

      TwoParts007.jpg

      and you will have this after making edges crease:

      TwoParts006_2012-04-16.jpg

      Kind regards,

    • #35897
      Hrvoje
      Participant

      By the way: there is no longitudinal edge starting from the point in the upper right corner:

      TwoPartsCrop.jpg

      Kind regards,

    • #35899
      adriano natalini
      Participant

      Thanks Dida,
      that was an earlier picture.
      attatched pls see the latest one.
      Adriano

    • #35900
      Hrvoje
      Participant

      Sorry! I have an older version of the project. 🙂

      Kind regards,

    • #35905
      adriano natalini
      Participant

      Hi here am again,
      Whenever I extrude from a curved edge I do not get exactely the same curvature as the original edge.
      Is there any way to master the problem or do we have to adjust the new desired curve by hand?
      The picture is showing my case, I am trying to give thickness to the cockpit wall.
      Thanks for any suggestion
      Adriano

    • #35906
      Hrvoje
      Participant

      Hi!
      You are working really hard! 🙂
      When you extrude an edge you are prompted to give the direction of extrusion, for each of three axis (x, y, z). If the edge is parallel with longitudinal axis and you extrude toward center line (only), new edge will be specified number of units (let’s say “d” units) moved toward CL. Because the edge is parallel with CL , new edge will be located at the distance “d” from original edge. If the edge is not parallel with CL and you extrude it with the same parameters as previous, new edge will not be at the distance “d” from original edge. The distance will be d x cos(alpha), if the edge is inclined to CL for alpha degrees. I believe that the problem is in this point.
      Now you see how bad boy was that Mr. Pitagora! 🙂
      If you want equal thickness for the wall you should extrude edge by edge and calculate parameters for extrusion. It is simpler adjust wall thickness by hand.
      Maybe Marven has better idea.

      Kind regards,

    • #35908
      adriano natalini
      Participant

      Thanks Dida,
      Yes it looks like that sofar!
      I divided the half circle into 3 sections which I extruded each one in its axis direction and adjust it by hand.
      It’s a tedious job and at some stage difficult to master and I believe, at least in my case, it will be not that clean.
      I hope there is another way which the administrator could suggest.
      Let’s hope it!
      Adriano

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