Question

我使用React并使用画布。我想将画布更改为WebGL（Threejs库）。如何将此库连接到React？

我有一些元素，例如

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

如何使其成为Threejs库调用的字段？ P.S：。我不想使用像react-threejs这样的扩展

Answer 1

以下是如何进行设置的示例（see demo）：

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

您可能也对full screen example感兴趣（请参阅GitHub）。

Here's an example using React Hooks而不是类（注意：Hook目前是实验性的）。

Answer 2

您可以使用库https://github.com/toxicFork/react-three-renderer

<强>安装

npm install --save react@15.5.3 react-dom@15.5.3 three@0.84.0
npm install --save react-three-renderer

<强>用法

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

我已经将three.js的第一个示例转换为React东西。希望这会有所帮助从'react'导入React；导入'./App.css'; 从“三个”中将*导入为三个；

class App extends React.Component{
  constructor(props){
    super(props)
    this.scene = new THREE.Scene();
    this.camera = new THREE.PerspectiveCamera(75,
      window.innerWidth / window.innerHeight,
      0.1,
      1000
      );
    this.renderer = new THREE.WebGL1Renderer();
        this.renderer.setSize( window.innerWidth, window.innerHeight );
    this.geometry = new THREE.BoxGeometry();
    this.material = new THREE.MeshBasicMaterial( { color: 0x32a852});
        this.cube = new THREE.Mesh( this.geometry, this.material)
  }
  animate = () => {
    requestAnimationFrame(this.animate)
    this.cube.rotation.x += 0.01;
    this.cube.rotation.y += 0.01;
    this.renderer.render(this.scene, this.camera);
    
  }
  componentDidMount() {
        document.body.appendChild( this.renderer.domElement );
        this.scene.add( this.cube );
        this.camera.position.z = 5;
        this.animate()
    }
  render(){
    return(
      <body id='document-body-01'>
      </body>
    );
  }
}

export default App;

因此，想法是可以将这三个组件分解为构造函数，动画函数和componentdidmount。我相信this.varname可以放在任何地方。我觉得构造函数是个好地方。这样也可以设置其他示例。

Answer 4

如果您正在使用挂钩。这是一个从three.js和React.js加载的3D模型的示例。

https://github.com/sarat9/react-threejs-sample/blob/master/src/animations/SoldierMachineAnimation/index.jsx

如何将Threejs连接到React？

4 个答案: