threeJs 创建文字方式

一，使用 TextGeometry创建3D文字

1.需加载字体配合使用，使用THREE.FontLoader

 // 加载字体
    loadFont() {
      return new Promise(function (resolve, reject) {
        const loader = new THREE.FontLoader();
        loader.load( './helvetiker.json', function ( response ) {
          try {
            resolve(response)
          } catch(error) {
            reject(error)
          }
        });
      })

    }

注意：如果出现中文乱码问题，需挑选中文字体文件再转换成json使用，转换地址：http://gero3.github.io/facetype.js

2，使用 TextGeometry添加

    const font = await this.loadFont()

    fontOption = {
      font: font,
      size: 0.5,
      height: 0,
      curveSegments: 1,
      bevelThickness: 1,
      bevelSize: 0,
      bevelEnabled: false,
      bevelSegments: 0,
    };
  
     
    let txtMater = new THREE.MeshBasicMaterial({color: 0xffffff});

     const txtGeo1 = new THREE.TextGeometry('你好123', fontOption);

     let txtMesh1 = new THREE.Mesh(txtGeo1, txtMater);

     txtMesh1.position.set(0, 0, 8);

     this.scene.add(txtMesh1);    

二、使用CanvasTexture + Sprite生成文字

    let canvas = document.createElement('canvas');
    canvas.width = 400;
    canvas.height = 200;

    const context = canvas.getContext('2d');
   
    context.font = '60px Microsoft YaHei';
    context.textAlign = 'center';
    context.fillStyle = '#ffffff';
    const text = '宽度：1.2'
    const textWidth =  context.measureText(text).width
    context.fillText(text, textWidth / 2, 80);
 
   
    const texture = new THREE.CanvasTexture(canvas);
    texture.needsUpdate = true;
    
    const textSprit = new THREE.Sprite(new THREE.SpriteMaterial({map: texture, color: 0xffffff}));

    textSprit.position.set(0, 0, 8);
    textSprit.scale.set(2, 2, 2)

    this.scene.add(textSprit);