react-three-map

React Three Map

react-three-map is a bridge to use react-three-fiber inside react-map-gl.

Until now you had:

imperative	declarative (react)
Maplibre/Mapbox	react-map-gl
THREE.js	react-three-fiber

Now with react-three-map, you can use them together :fist_right::star::fist_left:.

npm install react-three-map

• React Three Map
  • :book: Examples
  • :mag: What does it look like?
  • :thinking: Why we build this?
  • :gear: API
    • Canvas
      • Render Props
      • Render Props removed from @react-three/fiber
    • Coordinates
    • NearCoordinates
    • useMap
    • coordsToVector3
    • vector3ToCoords

:book: Examples

Check out our examples here (powered by Ladle).

:mag: What does it look like?

Let's build the same react-three-fiber basic example, but now it can be inside a map. (live demo).

• Import Canvas from react-three-map instead of @react-three/fiber.
• Give it a latitude and longitude so it knows where to position the scene in the map.
• Everything else should work just as usual.

import "maplibre-gl/dist/maplibre-gl.css"
import { createRoot } from 'react-dom/client'
import React, { useRef, useState } from 'react'
import { useFrame } from "@react-three/fiber"
import { useRef, useState } from "react"
import Map from "react-map-gl/maplibre"
import { Canvas } from "react-three-map/maplibre" 
// import { Canvas } from "react-three-map" // if you are using MapBox

function BasicExample() {
  return <Map
    canvasContextAttributes={{
      antialias: true,
    }}
    initialViewState={{
      latitude: 51,
      longitude: 0,
      zoom: 13,
      pitch: 60
    }}
    mapStyle="https://basemaps.cartocdn.com/gl/positron-gl-style/style.json"
  >
    <Canvas latitude={51} longitude={0}>
      <hemisphereLight
        args={["#ffffff", "#60666C"]}
        position={[1, 4.5, 3]}
      />
      <object3D scale={500}>
        <Box position={[-1.2, 1, 0]} />
        <Box position={[1.2, 1, 0]} />
      </object3D>
    </Canvas>
  </Map>
}

:thinking: Why we build this?

Look how complex is to add just one ThreeJS object to a map.

Look how complex is to create your custom root for R3F.

You can now replace all that complexity and hundreds of lines of code with the <Canvas> component exported by react-three-map, which includes a tone of extra features and seamless integration, supporting pointer events, raycasting, and much more, all out of the box.

:gear: API

Canvas

Same as in @react-three/fiber, the <Canvas> object is where you start to define your React Three Fiber Scene.

import "maplibre-gl/dist/maplibre-gl.css"
import Map from "react-map-gl/maplibre"
import { Canvas } from 'react-three-map/maplibre'
// import { Canvas } from "react-three-map" // if you are using MapBox

const App = () => (
  <Map 
    initialViewState={{ latitude: 51, longitude: 0, zoom: 13 }} 
    mapStyle="https://basemaps.cartocdn.com/gl/positron-gl-style/style.json" >
    <Canvas latitude={51} longitude={0}>
      <pointLight position={[10, 10, 10]} />
      <mesh>
        <sphereGeometry />
        <meshStandardMaterial color="hotpink" />
      </mesh>
    </Canvas>
  </Map>
)

It shares most of the props from R3F <Canvas>, so you can check them directly in the @react-three/fiber docs. There are a few important exceptions though, which are mentioned bellow.

Render Props

Prop	Description	Default
latitude	The latitude coordinate where to add the scene.
longitude	The longitude coordinate where to add the scene.
altitude	The altitude coordinate where to add the scene.	0
frameloop	Render mode: "always", "demand".	"always"
overlay	Render on a separated canvas.	false

About overlay

You may want to use overlay if:

• You use react-postprocessing and have issues clearing the screen.
• Want to avoid unnecesary map renders when only the Three scene changed.

But it comes with some caveats:

• ThreeJS will always render on top, as this is now a separated canvas and doesn't have access to the map depth buffer.
• react-postprocessing will also not work if you also use <Coordinates> components.

Render Props removed from @react-three/fiber

Because the scene now lives in a map, we leave a lot of the render and camera control to the map, rather than to R3F.

Therefore, the following <Canvas> props are ignored:

• gl
• camera
• resize
• orthographic
• dpr

Coordinates

This component allows you to have 3D objects at different coordinates.

import { Canvas, Coordinates } from 'react-three-map'

<Canvas latitude={51} longitude={0}>
  <Coordinates latitude={50} longitude={0}>
    <mesh><sphereGeometry /></mesh>
  </Coordinates>
  <Coordinates latitude={52} longitude={0}>
    <mesh><sphereGeometry /></mesh>
  </Coordinates>
</Canvas>

Props	Description	Default
latitude	The latitude coordinate where to add the scene.
longitude	The longitude coordinate where to add the scene.
altitude	The altitude coordinate where to add the scene.	0

NearCoordinates

Same as Coordinates, but scale is ignored in exchange of being able to be rendered under the same scene.

Works well at city level distances, but since scale remains unchanged, is not recommended at country level distances.

Check the story to see the difference between the two or check #102 for more info.

useMap

Access the map from inside react-three-map.

import { useMap } from "react-three-map";
// import { useMap } from "react-three-map/maplibre"; if you use maplibre
const Component = () => {
  const map = useMap();
  return <>...</>
}

coordsToVector3

This utility function converts geographic coordinates into a Vector3Tuple, which represents a 3D vector in meters.

Similar to NearCoordinates, remember that this only updates positions (translation) but that scale is not taken into account, which has an important factor at very long distances (country level).

Parameter	Description
point: Coords	The geographic coordinates of the point to convert.
origin: Coords	The geographic coordinates used as the origin for calculations.

Returns a Vector3Tuple representing the 3D position of the point relative to the origin.

vector3ToCoords

This utility function converts a Vector3Tuple, which represents a 3D vector in meters, back into geographic coordinates.

It is the inverse of coordsToVector3 but it does not have a good level of precision at long distances since we haven't reverse engineered #102 fix yet.

Recommended to use at city level distances, but margin errors will be noticeable at country level distances.

Parameter	Description
position: Vector3Tuple	The 3D vector to convert back into geographic coordinates.
origin: Coords	The geographic coordinates used as the origin for calculations.

Returns a Coords object representing the geographic coordinates of the point relative to the origin.