Latitude Longitude on 3D sphere

20 Comments + Add Comment

• 
  mgear 05/06/2014 at 10:10

  GeographicDistance:
  https://github.com/BiDuc/Oilmap-3D/blob/master/ASA/Assets/Scripts/CoordinateScripts/GeographicCoords.cs

  Reply
• 
  mgear 21/08/2014 at 13:57

  distance:
  http://codeflow.org/entries/2010/aug/27/geo-programming-with-python-and-javascript/

  Reply
• 
  mgear 26/10/2014 at 00:12

  lat.long. distance calculation:
  http://forum.unity3d.com/threads/vectrosity-fast-and-easy-line-drawing.270846/page-2#post-1822877

  Reply
• 
  mgear 26/03/2015 at 13:16

  convert google maps lat/lng to pixel coordinates and vice versa:
  https://gist.github.com/flarb/4980598

  Reply
• 
  Rich 23/06/2015 at 23:44

  Hi, I’ve just tested your project in Unity 5 and the marker seems to be a bit off – it seems to put it in somewhere near Romania. Do you know if something has changed? I’ve been trying to get the markers to match the correct location, but am having a tough time.

  Reply
  • 
    mgear 24/06/2015 at 01:28

    Most likely the model is just wrong (its default unity sphere, with the default UV mapping which breaks at top and bottom), cant remember if I had to manually adjust the material UV starting position to match London horizontally..

    Reply
    • 
      Rich 24/06/2015 at 01:40

      Yeah, I have tried playing with the material and getting it into the right position, but no matter what, my two points (Newcastle, UK; London, UK) seem to always end up in France!

      It’s driving me mad.

      This is what I am using:

      //Radius is 150… It is half the Scale of my sphere which is 300
      private Vector3 convertSphericalToCartesian(float lat, float lon, float radius)
      {

      //Convert to radians first
      lat = NormalizeRadian(DegreeToRadian (lat));
      lon = DegreeToRadian (lon);

      float x = radius * Mathf.Sin(lat) * Mathf.Cos(lon);
      float z = radius * Mathf.Sin(lat) * Mathf.Sin(lon);
      float y = radius * Mathf.Cos(lat);

      return new Vector3(x,y,z);
      }

      private float DegreeToRadian(float input){

      float output = 0.0f;
      output = Mathf.PI * input / 180;

      return output;
      }

      private float NormalizeRadian(float radian){
      return radian – 1.570795765134f;
      }

      Any ideas?

      Reply
      • 
        mgear 24/06/2015 at 03:22

        tested with 4.6x and 5.1, and the sphere is different in 5.1 (texture is clearly in a different position), so that breaks the old demo at least..

        Reply
        • 
          Luke 18/11/2015 at 11:49

          Hey did you figure how to position the sphere so that it lines up correctly? or must i just make a couple of tests and get a the highest accuracy by looking? if i can get the position of the seem then it should work out.

          anyway thanks for the example, at least i know in what direction to go
    • 
      mgear 19/11/2015 at 12:04

      no, havent made further tests.. in the old version i think it was just a matter of manually rotating the sphere until most locations match, but that wont be accurate of course..

      Reply
      • 
        Luke 20/11/2015 at 14:34

        hey mGear

        i finally got it right. i basically had to just give my sphere a y rotation of 180 and fix the uv mapping on it. oh and i had to convert the code to playmaker, this was a bitch to do.

        anyway rock on!

        Reply
        • 
          Simon Burfield 01/03/2016 at 13:22

          How did you fix the UV mapping?
• 
  mojtaba 09/07/2015 at 04:30

  Hi, Thanks very much I tried your project and it works great. How ever in my project I want to use a cylinder instead of an sphere. I wanted to ask if you know any ways to also change the rotation of the cylinder so it always stand straight on the earth sphere.
  Thanks very much

  Reply
  • 
    mgear 12/07/2015 at 20:49

    not sure if I understood, maybe image would help.. 🙂

    Reply
    • 
      mojtaba 12/07/2015 at 20:54

      Thanks, I was over complicating it, a simple lookAt solved my problem 🙂

      Reply
• 
  Ishan 11/09/2015 at 23:15

  Works great , Thanks buddy

  Reply
• 
  Simon Burfield 01/03/2016 at 13:20

  Hi there, this is super useful but running your current demo in unity, the placement is not in the right place, has unity 5 broken something?

  Reply
  • 
    mgear 01/03/2016 at 14:12

    added some new info here,
    http://unitycoder.com/blog/2016/03/01/latitude-longitude-position-on-3d-sphere-v2/

    Reply
    • 
      Simon Burfield 01/03/2016 at 15:21

      Thanks, you rock!!!

      Reply
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  […] 4)Globe asset:http://unitycoder.com/blog/2011/08/09/latitude-longitude-on-3d-sphere/ […]

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