Treant

Creating and displaying mesh from GeoJSON coordinates

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Hi, I want to create city map with 3D buildings. I have GeoJSON with building data. I'm using this data to make 2D polygonal mesh (building shape).

http://www.babylonjs-playground.com/#10IOII#14 (I've used example values)

Is there way to add 3'rd dimension to it? I want to use my 2D mesh as base for 3D Object. Is it possible to store this 3D object as Vector3? I want to map all verticles and keep them around for future use. (I'm starting with babylon.js, i don't know is this proper way to do it.)

{
   "type":"FeatureCollection",
   "features":[
      {
         "id":"w26358613",
         "properties":{
            "levels":8
         },
         "geometry":{
            "type":"Polygon",
            "coordinates":[
               [
                  [
                     13.426143,
                     52.51832
                  ],
                  [
                     13.426195,
                     52.518392
                  ],
                  [
                     13.426155,
                     52.518423
                  ],
                  [
                     13.426192,
                     52.518479
                  ],
                  [
                     13.426252,
                     52.518476
                  ],
                  [
                     13.426296,
                     52.51854
                  ],
                  [
                     13.426473,
                     52.518496
                  ],
                  [
                     13.426319,
                     52.518275
                  ],
                  [
                     13.426143,
                     52.51832
                  ]
               ]
            ]
         },
         "type":"Feature"
      }
   ]
}

 

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I will give you guys update on this.

I managed to parse geoJSON data and made Vector3 shapes out of it. :) (pic 1)

jpBVtj9.png

Then I extruded building shapes:

ZiFwDKo.png

All i need now is outline like in pic related: uSzHXSj.png

From what I read you can't use renderOutline() method on extruded shapes. I've seen this demo http://www.babylonjs-playground.com/#E51MJ#11 as an example of outline, but i can't apply it to my extruded shapes.
Should I construct my 3D mesh in some other way? I only have Vector3 outlines of buildings.

 

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On 12/2/2016 at 9:25 AM, Treant said:

I will give you guys update on this.

I managed to parse geoJSON data and made Vector3 shapes out of it. :) (pic 1)

 

Hey Treant!

Could you explain me how did you "convert" the geoJSON data into Vector3?

Thx in advance!
Tim

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Most of the time geoJSON are made of latitude/longitude coordinates which you can easily translate to babylonJS Vector3 with this function
 

let getVectorFromLatlng = (lat:number, lng:number, radius) => {

  var phi = (90-lat)*(Math.PI/180),
  theta = (lng+180)*(Math.PI/180),
  x = (radius) * Math.sin(phi)*Math.cos(theta),
  z = (radius) * Math.sin(phi)*Math.sin(theta),
  y = (radius) * Math.cos(phi);
  return new BABYLON.Vector3(x/3, y/3, z/3);
}

 

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On 10/14/2018 at 3:30 PM, pichou said:

Most of the time geoJSON are made of latitude/longitude coordinates which you can easily translate to babylonJS Vector3 with this function
 


let getVectorFromLatlng = (lat:number, lng:number, radius) => {

  var phi = (90-lat)*(Math.PI/180),
  theta = (lng+180)*(Math.PI/180),
  x = (radius) * Math.sin(phi)*Math.cos(theta),
  z = (radius) * Math.sin(phi)*Math.sin(theta),
  y = (radius) * Math.cos(phi);
  return new BABYLON.Vector3(x/3, y/3, z/3);
}

 

Hey :)

could you advise me how to load and render a geojson data file (this one for example https://a.data.osmbuildings.org/0.2/anonymous/tile/16/35210/21492.json )

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Here is the functions I created to draw world border lines from a geojson  file around a 3D sphere in https://wazana.io :
 

addWorldLines () {
    $.getJSON("yougeojsonfileurl", (data) => {
      let features = data.features;
      for (let i = 0; i < features.length; i++) {
        let geo = features[ i ].geometry;
        let coord = geo.coordinates;
        if (geo.type == 'Polygon') {
          this.buildLine(coord);
        } else {
          for (let j = 0; j < coord.length; j++) {
            this.buildLine(coord[j]);
          }
        }
      }
      this.setStyle();
    });
  }

  worldLines = [];
  buildLine (coord:Array<any>) {
    let gradient = BABYLON.Color3.FromHexString(Colors.gradient);
    for (let i = 0; i < coord.length; i++) {
      let poly = coord;
      let babylonGeo = [];
      for (let i = 0; i < poly.length; i++) {
        let pos =this. getVectorFromLatlng(poly[1], poly[0], this.radius);
        babylonGeo.push(pos);
      }
      let line = BABYLON.Mesh.CreateLines('sbline'+i, babylonGeo, this.scene);
      line.parent = this.sphere;
      line.isPickable = false;
      line.color = gradient;
      this.worldLines.push(line);
    }
  }

 

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