Creating and displaying mesh from GeoJSON coordinates

[Treant]

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"
      }
   ]
}

 

[Wingnut]

Hi @Treant, welcome to the forum.  What you speak-of is a bit over my head, but maybe this playground demo would help.  Extrusion, breakfast of champions. 

Maybe others will comment.  I'm not overly experienced with these things.  Again, welcome.  I'll be nearby.

[Klaas]

Hi,
maybe you are searching for a way to extrude 2d shapes into 3d objects.

Have a look here:
http://doc.babylonjs.com/tutorials/Parametric_Shapes#extrusion

and here

http://doc.babylonjs.com/classes/2.4/Mesh#static-extrudeshape-name-shape-path-scale-rotation-cap-scene-updatable-sideorientation-instance-rarr-mesh-classes-2-4-mesh-

 

[Treant]

I will give you guys update on this.

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

Then I extruded building shapes:

All i need now is outline like in pic related: 

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.

 

[GameMonetize]

I see no reason why renderOutline shoud not work on your mesh.

You can also think about using a more advanced option: highlights: http://www.babylonjs-playground.com/#1KUJ0A#0

(http://doc.babylonjs.com/tutorials/Highlight_Layer)

[Treant]

Sorry for noobish questions. My renderOutine is not displaying properly when mesh's material is transparent.
Example: http://www.babylonjs-playground.com/#ULLTW#3

It also has these weird corners:

[GameMonetize]

The outline is done by scaling meshes but they need to have their pivot at their center

I would highly recommend using  highlights instead in your case

[Nabroski]

@Treant

i found something interessting trough experimenting. maybe its usefull. i leave it here

http://www.babylonjs-playground.com/#ULLTW#5

[TimT77]

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

[pichou]

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);
}

 

[Lokamidou]

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 )

[pichou]

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);
    }
  }