Can’t figure out how to model the back

DELFTship forum Hull modeling Can’t figure out how to model the back

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    • #44617

      I’m new to the program and it’s very intuative but I can’t quite figure out how to do the back of the hull and get weird artifacts.

      The file was too big to attach so I uploaded it to Google Drive.

      Thanks in advance!

    • #44623

      Hi Tidexon, welcome to the forum.

      Maybe you can take a look at the historical vessels in the online database:

      New project -> Online model database -> type of vessel: Historical

      Look at the Brigg “Joachim Allwordt” has a similar stern,  the ‘Twee Gebroeders” or the “Groden” for ideas..

    • #44624
      Terrance Egolf

      Hello, Tidexon.

      I feel your pain! 19th-century sailing ships typically have very complex geometry at the stern and transom.

      For very curvy surfaces in this area, the only approach I have found that works in DELFTship is to increase the number of polygons, especially if you are trying to conform the model to existing plans.

      The downside of this approach is that you eventually need to merge the control mesh in the aft area of the hull—with many polygons—into the area of the main hull that can be modeled with fewer polygons. This creates distinct nodes at the junction of converging edges that don’t fare well with the surrounding hull.

      I have been working for nearly seven years on reconstructing the plans for a late 19th-century brigantine, the Galilee. This image shows how I had to really subdivide the stern area of the model to create the desired surface to match the existing plans:


      As you get closer to finalizing the shape of the hull, you should add station, waterline, and buttock intersections to guide adjusting the control net. Where the change of hull shape is more dramatic, you will need to add more intersections, which is done under the Tools tab in the Project Tools menu group. In the second image, I have included station and buttock lines:


      When fine-tuning the hull shape, you can use all three types of intersections simultaneously. Also, the program has the option of including diagonals, which are extremely useful for checking fareness. Realize that actual ships always had to deal with hogging and other unfareness in their hulls, so stressing about a few inches/centimeters of unfareness is probably not worth the trouble.

      Hope these examples help!


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