How to get rid of unnecessary surface

DELFTship forum General Questions How to get rid of unnecessary surface

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    • #44506
      Hrvoje
      Participant

      Hi!

      I do not know how to get rid of the surface marked on the attached picture. Also, I attached the FBM file.

      Please, can somebody help?

      Kind regards, Hrvoje

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    • #44509
      Terrance Egolf
      Participant

      Hello, Hrvoje.

      I took a look at your attached file and there are several issues working together to cause this problem

      First, as a general technical issue, DELFTship doesn’t handle concave corner intersections between non-coplanar surfaces well. The surface perpendicular to the corner axis tends to get dragged through the corner instead of observing the concave angle. That was the main cause of the surface you pointed out.

      However, in your model there was another issue that contributed to the problem. You created three mutually perpendicular surfaces that appear to intersect at the highlighted point:

      Tegljac-nadgradje-1
      However, if you randomly move that point, you can see that the front surface is actually separate from the other two along the vertical edge. It’s only joined at the upper corner point:

      Tegljac-nadgradje-2a

      The easiest way to fix this is delete the facing surface, then rebuild it using the six nearest control points (highlighted):

      Tegljac-nadgradje-2

      Notice that we still have the flap cutting the corner, even though the corner point at the intersection of the three surfaces is automatically designated a “corner point.”

      To fix this, you have to “reinforce” the corner using some additional edges:

      Tegljac-nadgradje-4

      One edge does a pretty good job of eliminating most of the flap. I added another point and edge directly below the corner point, since that might be a logical place for an edge in your model.

      I have found that in most circumstances, you will need a minimum of two interior edges or another crease edge to eliminate these flaps across concave corners like this.

      Hope this helps.

      Terry

       

       

       

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    • #44516
      Hrvoje
      Participant

      Hi, Terry!

      Thank you a lot for your engagement and the solution. I appreciate it so much.

      Kind regards, Hrvoje

      • This reply was modified 2 months, 4 weeks ago by Hrvoje.
    • #44518
      Terrance Egolf
      Participant

      You are very welcome, Hrvoje.

      I have been using DELFTship for nearly six years to reconstruct the plans for a 19th century brigantine built on the West coast of the US in 1891. My grandfather sailed in her for several years conducting scientific geomagnetic surveys of the Pacific Ocean. Very little in the way of useful plans exist of this vessel. However, I have many photos taken during 1905 through 1908 of the ship documenting her scientific charter period, which have been excellent references.

      As a member of the Nautical Research Guild, I have a long-running topic on their Model Ship World forum documenting my research into this vessel. If you are interested, you can access the topic here.

      Many, many hundreds of hours have been invested into using this program—for hull modeling only—so if there is some kind of problem working with the program, I probably have seen it! Feel free to contact me directly via the messaging feature at Model Ship World if you wish.

      Best regards,

      Terry

      Colorado Springs, Colorado, USA

    • #44521
      Hrvoje
      Participant

      Thank you, Terry!

      I am also a member of the Model Ship World forum and I will visit the post on the submitted link.

      Kind regards, Hrvoje

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