![](/img/trans.png)
[英]React-Three-Renderer refs not current in componentDidUpdate (MVCE included)
[英]Sprite Labels with React-Three-Renderer (MVCE included)
我正在使用react-three-renderer( npm , github )與three.js構建場景。
我試圖使用<sprite>
和<spriteMaterial>
制作一個始終面向相機的標簽,就像stemkoski的示例中一樣 。
但是,我無法顯示標簽並正確設置其坐標。 我在Sprite-Label-Test上有一個最低可驗證的完整示例。 下載它,運行npm install
,然后打開_dev / public / home.html。
我的目標是在期望的位置顯示文本,但是正如您所看到的,它只是黑色。 為了證明精靈在相機的視野中,我在同一位置放了一個盒子。 要查看該注釋,請從render方法中重新注釋一下。
這是我的檔案。 它有兩個主要組件, componentDidMount
方法(用於為精靈創建文本)和render
方法。
var React = require('react');
var React3 = require('react-three-renderer');
var THREE = require('three');
var ReactDOM = require('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, 100);
}
componentDidMount() {
var text = "Hello world";
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
var metrics = context.measureText( text );
var textWidth = metrics.width;
context.font = "180px arial Bold";
context.fillStyle = "rgba(255,0,0,1)";
context.strokeStyle = "rgba(255,0,0,1)";
context.lineWidth = 4;
context.fillText( text, 0, 0);
var texture = new THREE.Texture(canvas)
texture.needsUpdate = true;
this.spriteMaterial.map = texture;
this.spriteMaterial.useScreenCoordinates = false;
}
render() {
const width = window.innerWidth; // canvas width
const height = window.innerHeight; // canvas height
var position = new THREE.Vector3(0, 0, 10);
var scale = new THREE.Vector3(1,1,1);
return (<React3
mainCamera="camera" // this points to the perspectiveCamera which has the name set to "camera" below
width={width}
height={height}
>
<scene>
<perspectiveCamera
name="camera"
fov={75}
aspect={width / height}
near={0.1}
far={1000}
position={this.cameraPosition}
/>
<sprite position={position} scale={scale} ref={(sprite) => this.sprite = sprite}>
<spriteMaterial ref={(spriteMaterial) => this.spriteMaterial = spriteMaterial}></spriteMaterial>
</sprite>
{/*<mesh position={position}>
<boxGeometry
width={10}
height={10}
depth={10}
/>
<meshBasicMaterial
color={0x00ff00}
/>
</mesh>*/}
</scene>
</React3>);
}
}
ReactDOM.render(<Simple/>, document.querySelector('.root-anchor'));
我究竟做錯了什么? 我該如何在行var position = new THREE.Vector3(0, 0, 10);
建立的位置中顯示精靈文本標簽var position = new THREE.Vector3(0, 0, 10);
? 提前致謝。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.