在three.js场景中未渲染3D文本

Question

The text 'Hello three.js!' is not rendering in my scene. It worked fine when I was using BoxGeometry but I seem to missing something for TextBufferGeometry.

var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 ); // fov, aspect, near and far
camera.position.set(-15, 0, 25);
camera.lookAt( scene.position );

var loader = new THREE.FontLoader();

loader.load( 'fonts/helvetiker_regular.typeface.json', function ( font ) {

  var material = new THREE.MeshPhongMaterial( { color: 0x0033ff, specular: 0x555555, shininess: 30 } );

  var textGeo = new THREE.TextGeometry( 'Hello three.js!', {
    font: font,
    size: 80,
    height: 5,
    curveSegments: 12,
    bevelEnabled: true,
    material: 0,
    extrudeMaterial: 1
  } );

  textGeo.computeBoundingBox();
  textGeo.computeVertexNormals();

  var mesh = new THREE.Mesh( textGeo, material );

  scene.add(mesh);

} );

var light = new THREE.DirectionalLight( 0xffffff );
light.position.set( 0, 1, 1 ).normalize();
scene.add(light);


var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );

renderer.render( scene, camera );

I can't make sense of three.js documenation for TextGeometry https://threejs.org/docs/#api/geometries/TextGeometry

Answer 1

I needed to move the render code inside the font loader callback.

var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 ); // fov, aspect, near and far
camera.position.set(-15, 0, 25);
camera.lookAt( scene.position );

var loader = new THREE.FontLoader();

loader.load( 'fonts/helvetiker_regular.typeface.json', function ( font ) {

  var material = new THREE.MeshPhongMaterial( { color: 0x0033ff, specular: 0x555555, shininess: 30 } );

  var geometry = new THREE.TextGeometry( 'Hello three.js!', {
    font: font,
    size: 80,
    height: 5,
    curveSegments: 12,
    bevelEnabled: true,
    bevelThickness: 10,
    bevelSize: 8,
    bevelSegments: 5
  } );

  var mesh = new THREE.Mesh( geometry, material );

  scene.add(mesh);

  var light = new THREE.DirectionalLight( 0xffffff );
  light.position.set( 0, 1, 1 ).normalize();
  scene.add(light);


  var renderer = new THREE.WebGLRenderer();
  renderer.setSize( window.innerWidth, window.innerHeight );
  document.body.appendChild( renderer.domElement );

  renderer.render( scene, camera );

} );