Photo Scaling

DELFTship forum Hull modeling Photo Scaling

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    • #37072
      Jonathan Eeles
      Participant

      I am trying to use a photograph of the hull of my boat to produce a scale drawing in the free version of the programme. How can I get the photo to fit the scale grid? the length of the project is set at the waterline lenght of the boat. I have imported the photo at various resolutions but the programme displays them all the same size which does not fit. I want to use the programme to work out a Ketch sail plan for the boat. Have a look at the photo attached Suggestions much appreciated thanks. Jon

      BackgroundPorthullflipped.jpg

      .

    • #37074
      Kenneth Weir
      Participant

      To position the image:
      On your profile view, right-click anywhere convenient, select Background Image > Origin. Now click & drag the image until one point in the picture is in the right place. I prefer the aft end of the keel, but anywhere convenient should work. You’re only setting a reference point right now.

      To scale the image:
      Assuming you already have a skeleton of the hull begun, in the profile view hover your pointer over the very tip of the bow on your model & write down the coordinates. Right-click again, select Background Image > Scale Image, click the very tip of the bow on the background image & then type in the coordinates you wrote down earlier for the new position.

      A little fine-tuning / adjusting may be needed but that will get you very close.

      You can also adjust the transparency of the image by right-clicking, selecting Background Image > Blending. Makes it easier to see your model that way sometimes.

      Looks like a fun one!
      🙂

      What’s the length/displacement on that boat?

    • #37075
      Jonathan Eeles
      Participant

      Thanks very much for your quick response Relenah. I will try that tomorrow, its 1.30 am now I have been looking at this screen too long. The boat is 60 feet overall, I don’t know what the displacement is, I would guess at around 50 tons. All the best. Jon.

    • #37076
      Kenneth Weir
      Participant

      I’d like to see some pictures once you get going. Are you leaning towards gaff or bermuda rig? Gaff rig is a bit more involved, but would really suit that boat in my opinion. 🙂

    • #37079
      Jonathan Eeles
      Participant

      Hello Relenah. Yes she will have a Gaff Ketch rig. I have aquired a pair of masts from another decommissioned fishing boat . I started this project four years ago so I have made some progress, but there is still a huge amount of work to do. I have some pictures on Flikr. Click on this Fairmorn Photo set. If it doesn’t work Paste this link in your browser. http://www.flickr.com/photos/41168865@N03/sets/72157629717725839/
      I need to work out the sail plan so I can decide where to position the masts. Geometry and hard sums were never my strong point so I am hoping Delftship will help with that. I haven’t yet discovered if the programme will find the centres of sails and of the whole sail set. Do you or does any one else know about this? Thanks for your interest. Jon.

    • #37082
      Kenneth Weir
      Participant

      The link worked fine, looks like you really had your work cut out for you on this one, but it seems to be coming together nicely.

      If you can get an accurate hull shape modeled Delfship will calculate the center of resistance for you on the hull. That’ll make the sail plan a lot easier.

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