reactjs - puerto - ¿Cómo conectar Threejs a React?

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Question

Trabajo con React y uso un lienzo. Quiero cambiar el lienzo a WebGL (biblioteca Threejs). ¿Cómo conectar esta librería a React?

Tengo algun elemento, por ejemplo

<div ref="threejs"></div>

¿Cómo convertirlo en un campo para la llamada de la biblioteca Threejs? PD:. No quiero usar extensiones como react-threejs

Answer 1

Aquí hay un ejemplo de cómo configurar esto ( ver demostración ):

import React, { Component } from ''react''
import * as THREE from ''three''

class Scene extends Component {
  constructor(props) {
    super(props)

    this.start = this.start.bind(this)
    this.stop = this.stop.bind(this)
    this.animate = this.animate.bind(this)
  }

  componentDidMount() {
    const width = this.mount.clientWidth
    const height = this.mount.clientHeight

    const scene = new THREE.Scene()
    const camera = new THREE.PerspectiveCamera(
      75,
      width / height,
      0.1,
      1000
    )
    const renderer = new THREE.WebGLRenderer({ antialias: true })
    const geometry = new THREE.BoxGeometry(1, 1, 1)
    const material = new THREE.MeshBasicMaterial({ color: ''#433F81'' })
    const cube = new THREE.Mesh(geometry, material)

    camera.position.z = 4
    scene.add(cube)
    renderer.setClearColor(''#000000'')
    renderer.setSize(width, height)

    this.scene = scene
    this.camera = camera
    this.renderer = renderer
    this.material = material
    this.cube = cube

    this.mount.appendChild(this.renderer.domElement)
    this.start()
  }

  componentWillUnmount() {
    this.stop()
    this.mount.removeChild(this.renderer.domElement)
  }

  start() {
    if (!this.frameId) {
      this.frameId = requestAnimationFrame(this.animate)
    }
  }

  stop() {
    cancelAnimationFrame(this.frameId)
  }

  animate() {
    this.cube.rotation.x += 0.01
    this.cube.rotation.y += 0.01

    this.renderScene()
    this.frameId = window.requestAnimationFrame(this.animate)
  }

  renderScene() {
    this.renderer.render(this.scene, this.camera)
  }

  render() {
    return (
      <div
        style={{ width: ''400px'', height: ''400px'' }}
        ref={(mount) => { this.mount = mount }}
      />
    )
  }
}

export default Scene

También puede interesarle un ejemplo de pantalla completa (consulte GitHub ).

Aquí hay un ejemplo que usa React Hooks en lugar de una clase (nota: los Hooks son actualmente experimentales).

Answer 2

Puede usar la biblioteca https://github.com/toxicFork/react-three-renderer

Instalación

npm install --save [email protected] [email protected] [email protected]
npm install --save react-three-renderer

Uso

import React from ''react'';
import React3 from ''react-three-renderer'';
import * as THREE from ''three'';
import ReactDOM from ''react-dom'';

class Simple extends React.Component {
  constructor(props, context) {
    super(props, context);

    // construct the position vector here, because if we use ''new'' within render,
    // React will think that things have changed when they have not.
    this.cameraPosition = new THREE.Vector3(0, 0, 5);

    this.state = {
      cubeRotation: new THREE.Euler(),
    };

    this._onAnimate = () => {
      // we will get this callback every frame

      // pretend cubeRotation is immutable.
      // this helps with updates and pure rendering.
      // React will be sure that the rotation has now updated.
      this.setState({
        cubeRotation: new THREE.Euler(
          this.state.cubeRotation.x + 0.1,
          this.state.cubeRotation.y + 0.1,
          0
        ),
      });
    };
  }

  render() {
    const width = window.innerWidth; // canvas width
    const height = window.innerHeight; // canvas height
    return (<React3
      mainCamera="camera" // this points to the perspectiveCamera which has the name set to "camera" below
      width={width}
      height={height}

      onAnimate={this._onAnimate}
    >
      <scene>
        <perspectiveCamera
          name="camera"
          fov={75}
          aspect={width / height}
          near={0.1}
          far={1000}
          position={this.cameraPosition}
        />
        <mesh
          rotation={this.state.cubeRotation}
        >
          <boxGeometry
            width={1}
            height={1}
            depth={1}
          />
          <meshBasicMaterial
            color={0x00ff00}
          />
        </mesh>
      </scene>
    </React3>);
  }
}
ReactDOM.render(<Simple/>, document.body);

Answer 3

Sé que la pregunta es un poco vieja, pero si alguien todavía está buscando algo. Intentarías https://github.com/drcmda/react-three-fiber . Tienen algunos fragmentos y demostraciones en su github.