Frustrated! Cannot modify background image!

DELFTship forum Hull modeling Frustrated! Cannot modify background image!

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    • #37315
      Lancer -525
      Participant

      I’m pretty much at my wit’s end here.

      I’ve been trying for several days to import a JPG file of my body plan drawing, and my center-profile elevation view as background images upon which to set points, but no matter what I do, the drawings do not line up with where the points on the net fall.

      In other words, the profile view background image is about twice as long as the “new file hull’ and the lines plan drawing (showing all the frames) is about half as tall as the “new file hull”

      No matter what I do, I cannot modify the size of the drawings in Delftship. I even put them on the same drawing (lines plan and profile section together) and the scale is still wrong.

      Furthermore, the frames do not line up with the frame lines in the profile view. In other words, when I move the edge line at the bow to fit the drawing in the background, and then switch to the bodyplan view, the lines do not match up.

      I’m almost at the point of asking if anyone else could model this hull for me.

    • #37316
      Robert Holme
      Participant

      Not far off

      1. Start new model and put in minimum basic parameters i.e:

      LBP and not as you have LOA.
      Full Beam
      Designed or guesstimate draft.

      At the start to keep things easy I leave longtitudinals at 6 and only 3 verticals.

      Now up pops this orrible looking bath tub!

      Select profile view.

      Right click on the screen and load the background image
      Right Click on the image and select origin I usually place the aft perpendicular on the 0 and the base on the base line. The position longtitudinally is the important one.
      When your happy (it sometimes more than one attempt to set the origin). Right click on the image and click on set X and Y the same.
      Right click on the image again and select set scale. left click on the image at the top of the forward perpendicular and note the readings. click inside the box and change the x reading to match the input parameter.
      Your image should now be the same length as the bathtub.

      Now bring the top row of bathtub points down to the top of your image.
      Next bring the middle row down to somewhere between the top and the base.
      Lastly adjust the points on the base row to match the image.

      You should now have a rough profile.

      Place and set the origin of your body plan.

      NB if you are using separate images for profile, plan and bodyplan ensure they are all drawn to the same scale before loading them because setting the scale of the 1st image loaded will determine the scale of any other images loaded.

      Hope that helps.

      I took a guess and said 100M LBP and ended up with this after loading your image 2.

      Best Regards
      Bob

      Attachments:
    • #37317
      Lancer -525
      Participant

      Bob: Thanks for your reply, but I don’t understand hardly anything in it.

      You’re using a lot of jargon and technical terms, and that doesn’t mean a bloody thing to me. What is LBP? I don’t recall EVER having seen that in the program, anywhere. I have set the origin, but since the Waterline is the constant for what I am doing, I have to set that at the designed waterline, and that is my origin. I can set an origin, no problems, so thanks.

      Now, I do know what the LOA is, and that is one of the only dimensions I actually have to work with. The Beam dimension and Draught are the other two.

      If you’d read carefully, it doesn’t matter what I do when trying to scale the background image, because nothing happens. The image does not resize, and nothing I can do will change it. I’ve tried every solution for rescaling background images I could find on the forum, and nothing works.

      Also, and I don’t know why, but the file you attached is not recognized by any program I have. I even tried downloading it to open it with Delftship, and I could not open it even then. So, I don’t know what is in it.

      Now, assuming that what you’ve said works, now comes the problem of adding in the other 17 verticals to get the frames to match, and the remaining 24 longitudinals to get the hullform to appear correctly. I have never been able to figure out how to add in extra lines in a ship form.

      So, I guess I’m stumped on this one. I can’t figure out anything. Something somewhere is not working correctly.

      I am using v6.27.259 64bit.

      Thanks anyway.

    • #37320
      Robert Holme
      Participant

      I have no idea why the file I attached will not open using Delftship it was made in v6.27.259 64 bit.

      Sorry to use terms you do not understand. LBP is length between perpendiculars. From what I can see of your profile and plan the vessel looks to have a cruiser stern and a sloped back, (negatively raked), bow.

      I have edited your image to show what I mean.

      May I suggest you do this attached tutorial before you go on and most of your queries should be answered.

      Best Regards
      Bob

    • #37322
      Lancer -525
      Participant

      Thanks for taking the time to reply, Bob…

      Although I wasn’t really asking for basic tutorial help. I’ve done three other hulls in Delftship going back to 2009 or so. I was really hoping for something more along the lines of troubleshooting. 😉 That was an interesting tutorial though. I did learn something from it.

      I finally ended up deleting the program, and reinstalling it, and everything is working fine now. I’m a quarter of the way through modeling the hull. Just a few hours of moving points around… :blink:

      BTW, it is a French armored cruiser from the late 19th Century… :whistle:

      Much appreciated!

    • #37323
      Robert Holme
      Participant

      Glad you got it sorted.

      I have not been using DS very long and yes IMHO it’s not an intuitive program but having said that once you get into it it produces really great hulls…………..far and away better than what my CAD program can produce lofting station lines.

      I figured it was a French warboat but it’s not listed in the Wiki of French ship names. With that hull shape it had to be turn of the 19-20 century design.

      Best Regards
      Bob

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