Offset curve

DELFTship forum Feature requests Offset curve

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    • #36814
      Denis Pratt
      Participant

      Hi,
      I would like to offset a curve, either chine or deck edge, a parallel distance from the initial curve. Is there a technique to do this. I want to create and duplicate a separate layer so that a Dee shaped fender can be bolted to it once nc cut and welded to the hull.
      Presently I can copy and move an existing curve in the x, y or z directions but not offset one to form an edge a parallel distance from the initial curve in two ot three directions.
      Kind regards,

      Denis

    • #39494
      Beaver
      Participant

      Hi
      I’ve the same problem. Like to draw gunwales on the upper edge of a rowboat. Need a set of new points offset to the points defining the upper edge of the hull. Any ideas? Thanx

    • #39495
      Icare
      Participant

      The best thing I can suggest you is to use the OFFSET SURFACE button to create a parallel surface.

      If you need just the surface edge, use the concerned edge of this new surface to EXTRUDE or CREATE A NEW SURFACE, then delete the parallel surface when/if you do no long need it.
      This way you can too draw both faces of a plank, then connect them to get the plank’s side surface, for example. (But be careful: drawing planks’ both sides may affect the weight calculations).

      Unfortunately, the temporary surface will be drawn on the same layer than the original.
      If you need to keep a part of the temporary surface on an other layer, the only way I found (on my old version) is to delete and re-draw each polygon one after the other on the new layer… Time consuming and boring…

    • #39496
      Beaver
      Participant

      Thank you, Icare.
      I’m aware of the solution you suggest, but found it not very elegant, some times an overkill for the problem, and time consuming as well.
      I think it is not a BIG problem, to improve the product by adding some code to be allow one of these:
      – copy a collection of selected pointy and insert the copy of them at another place
      – shift a collection of points by a certain value for X, Y, and Z
      – create a linear copy (as known from CAD systems) of a collection of selected points
      (linear is o.k., but it would be nice to have other opportunities like e.g. array copy and radial copy as well)

      Is there a place to post such wishes?

      all the best, Ruedi

    • #39497
      Icare
      Participant

      You posted it in the right place (figure requests’ page).
      Now, you’ve to wait for Martin (forum admin & Delfship creator) to read it… and it may take several weeks. :whistle:

      There are so many things to do and so little time do do them all… 😉

    • #39498
      Maarten
      Keymaster

      Hi Ruedi,

      This feature already exists- sort of.. Copying points is not very meaningful, since copying points (without surfaces) is, well, pointless, we have opted to copy surfaces: select a surface, and then use shifr-ctrl to drag a copy of the surface.
      Moving a selction of points has been a feature for a very long time- check the manual.

    • #39500
      Beaver
      Participant

      Hi Maarten

      thank you.
      Probabaly it is better to talk about what I want to have then about what I want to do. The latter leads to assumptions, but the first one is measurable.
      First of all: I know both functions you mention, and I’m able to use them as well.

      What I want to have is the following:
      I have drawn a rowboat hull by using the views of an old rowboat plan. Now I want to have in my drawing the inner and outer gunwales along the top edge of the side of the boat. I’d like to be able shift a copy of all points along the top edge sideways, each by the width of the gunwale, and the shift a copy of these new points downwarsd by the height of the gunwale. Then I will add the surfaces to draw the gunwale.
      Shifiting the top plank does not deliver what I want.
      So I exported the control points coordinates, imported them in a table calculation sheet, computed the values for the control points I need for the gunwales, and imported these values into delfsthip. Somehow nifty, and not ver efficient, I think.

      But I’m aware that I’m probabaly barking at the wrong tree. If there’s a more elegant and efficient way to get what I want, please let me know. Any tips for doing this more efficient are highly appreciated. Thank you, and have a good time, Ruedi

    • #39501
      Beaver
      Participant

      Hi
      I’ve found this just now.
      https://www.youtube.com/watch?v=Y0mX3VwCcHs
      Looks interesting, but it is still a lot of work to get a relative simple thing. Is there another opportunity, e.g. something like a simple 2d surface extrusion along a path to create a 3d object like a gunwale? Thanx.

    • #39503
      Beaver
      Participant

      I think that the solution shown in the video mentioned above is a bit too complicated. It is way easier to get the same by extruding the top edges. For a gunwale on the outside of the boat: select whole top edge, extrude it – transverse – direction out side, extrude it – vertical – direction bottom, extrude it – transverse – direction hull side. Close both ends with a plane, and adjust the ends to fit the hull ends.

      Fast and easy … not perfect, but there’s always room for improvement 🙂

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