[THREE] 请问CSS3DRenderer怎么控制字体的大小

Question

我在使用CSS3DRenderer渲染的时候DIV中的文字变的非常大，请问怎么控制DIV中的文字大小。

全部代码：

import { CSS3DRenderer, CSS3DObject } from 'three/examples/jsm/renderers/CSS3DRenderer';
import { Scene, PerspectiveCamera, Mesh, PlaneGeometry, MeshPhongMaterial, Color, DoubleSide, NoBlending, WebGLRenderer, MeshBasicMaterial, GridHelper } from 'three';
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls';

export class CSS3DDemo {
  private scene: Scene;
  private camera: PerspectiveCamera;
  private css3DRenderer: CSS3DRenderer;
  private webGLRenderer: WebGLRenderer;
  private controls: OrbitControls;

  constructor() {
    this.scene = new Scene();
    this.camera = new PerspectiveCamera(50, window.innerWidth / window.innerHeight, 0.1, 500);
    this.webGLRenderer = new WebGLRenderer();
    this.css3DRenderer = new CSS3DRenderer();
    this.controls = new OrbitControls(this.camera, this.css3DRenderer.domElement);

    this.webGLRenderer.setSize(window.innerWidth, window.innerHeight);
    this.webGLRenderer.setClearColor(0xFFFFFF);
    this.css3DRenderer.setSize(window.innerWidth, window.innerHeight);
    this.css3DRenderer.domElement.style.position = 'absolute';
    this.css3DRenderer.domElement.style.top = '0px';
    this.css3DRenderer.domElement.style.left = '0px';

    this.camera.position.set(0, 0, 10);

    const div = window.document.createElement('div');
    div.innerHTML = `this is content`;
    div.style.width = '10px';
    div.style.height = '10px';
    // div.style.background = 'lightblue';
    const object = new CSS3DObject(div);
    object.position.set(0, 0, 0);
    this.scene.add(object);

    const planeGeometry = new PlaneGeometry(10, 10);
    const planeMesh = new Mesh(planeGeometry, new MeshBasicMaterial({ color: 0xFF0000, side: DoubleSide }));
    planeMesh.position.copy(object.position);
    this.scene.add(planeMesh);

    this.scene.add(this.camera);
    this.scene.add(new GridHelper(100, 100));
    window.document.body.appendChild(this.webGLRenderer.domElement);
    window.document.body.appendChild(this.css3DRenderer.domElement);
    this.render();
  }

  private render() {
    window.requestAnimationFrame(() => this.render());
    this.css3DRenderer.render(this.scene, this.camera);
    this.webGLRenderer.render(this.scene, this.camera);
    this.controls.update();
  }
  
}

CodePen: https://codepen.io/hungtcs/pen/xxbZOQV

谢谢！

Answer 1

浏览器会限制最小字体大小，比如Chrome为8px，所以设置非常小的font-size没有效果。

CSS3DRenderer中，一个px相当于一个3D世界单位，假如字体大小为16px，可以将缩放设置为1/16

Answer 2

试了一下，this.css3DRenderer.domElement.style.fontSize = '20px';这样可以设置大小，但是fontsize小到一定程度之后就没什么效果了，这个时候可以试试object.scale.set(0.5, 0.5, 0.5);