Three Object

Example

Example Source Code

import React, { useCallback, useEffect, useRef, useState } from 'react'
import ReactDOM from 'react-dom'
import * as THREE from 'three'
import { MbMap, MbTiandituLayer } from '@mapbox-react/core'

const App = () => {
  const [mapCenter] = useState([116.3466, 39.8704])
  const [zoom, setZoom] = useState(14)
  const [pitch, setPitch] = useState(45)
  const mapInst = useRef<any>()

  let map: any
  const altitude = 0

  const mapCreated = (mapbox: any) => {
    map = mapbox
  }
  const add3DLayer = () => {
    loaderModels()
  }
  const loaderModels = () => {
    const modelAsMercatorCoordinate =
      map.mapboxgl.MercatorCoordinate.fromLngLat(mapCenter, altitude)

    // transformation parameters to position, rotate and scale the 3D model onto the map
    const modelTransform = {
      translateX: modelAsMercatorCoordinate.x,
      translateY: modelAsMercatorCoordinate.y,
      translateZ: modelAsMercatorCoordinate.z,
      /* Since our 3D model is in real world meters, a scale transform needs to be
       * applied since the CustomLayerInterface expects units in MercatorCoordinates.
       */
      scale: modelAsMercatorCoordinate.meterInMercatorCoordinateUnits(),
    }

    const geometry = new THREE.PlaneGeometry(200, 200)
    const material = new THREE.MeshBasicMaterial({
      map: new THREE.TextureLoader().load(
        `https://mapbox-web.github.io/mapbox-react/images/firefox.png`
      ),
      transparent: true,
      // color: 0xffff00,
      side: THREE.DoubleSide,
    })
    const plane = new THREE.Mesh(geometry, material)
    plane.name = 'plane'

    const cube = new THREE.Mesh(
      new THREE.BoxGeometry(200, 200, 200),
      new THREE.MeshNormalMaterial()
    )
    cube.name = 'cube'

    const cube1 = cube.clone()
    cube1.material = new THREE.MeshNormalMaterial()
    cube1.name = 'cube1'

    addThreeLayer(modelTransform, plane, cube, cube1)
  }
  const addThreeLayer = (modelTransform, plane, cube, cube1) => {
    const threeLayer = {
      id: '3d-model',
      type: 'custom',
      renderingMode: '3d',
      camera: null as unknown as THREE.PerspectiveCamera,
      scene: null as unknown as THREE.Scene,
      renderer: null as unknown as THREE.WebGLRenderer,
      onAdd(map, gl) {
        this.camera = new THREE.PerspectiveCamera()
        this.scene = new THREE.Scene()

        plane.translateZ(200)
        cube.translateX(400)
        plane.rotation.x = -Math.PI / 2

        this.scene.add(plane)
        this.scene.add(cube)
        this.scene.add(cube1)

        {
          const skyColor = 0xb1e1ff // light blue
          const groundColor = 0xb97a20 // brownish orange
          const intensity = 3
          const light = new THREE.HemisphereLight(
            skyColor,
            groundColor,
            intensity
          )
          this.scene.add(light)
        }

        // use the Mapbox GL JS map canvas for three.js
        this.renderer = new THREE.WebGLRenderer({
          canvas: map.getCanvas(),
          context: gl,
          antialias: true,
        })

        this.renderer.autoClear = false
      },
      render(gl, matrix) {
        const m = new THREE.Matrix4().fromArray(matrix)
        const l = new THREE.Matrix4()
          .makeTranslation(
            modelTransform.translateX,
            modelTransform.translateY,
            modelTransform.translateZ
          )
          .scale(
            new THREE.Vector3(
              modelTransform.scale,
              -modelTransform.scale,
              modelTransform.scale
            )
          )

        this.camera.projectionMatrix = m.clone().multiply(l)
        this.camera.matrixWorldInverse = new THREE.Matrix4()
        this.renderer.resetState()

        this.renderer.render(this.scene, this.camera)
      },
    }
    map.addLayer(threeLayer as CustomLayerInterface)
  }

  return (
    <div className="map-wrapper">
      <MbMap
        ref={mapInst}
        center={mapCenter}
        zoom={zoom}
        pitch={pitch}
        onCreated={mapCreated}
      >
        <MbTiandituLayer types={['vec', 'cva']} onCreated={add3DLayer} />
      </MbMap>
    </div>
  )
}

ReactDOM.render(<App />, document.querySelector('#root'))