Question

我试图在three.js（http://threejs.org/examples/#svg_sandbox）中使用SVGRenderer。该示例显示了如何动态创建SVG元素（圆圈）。我想导入我已经在计算机中的SVG文件。我该怎么办？

createElementNS命令似乎不支持导入SVG文件？

我基本上希望我的image.svg显示在three.js场景中。

Answer 1

您可以使用THREE.SVGLoader()库来实现它：

＆＃13;

var svgManager = new THREE.LegacySVGLoader();
var url = 'https://upload.wikimedia.org/wikipedia/commons/b/b0/NewTux.svg';

function svg_loading_done_callback(doc) {
  init(new THREE.SVGObject(doc));
  animate();
};

svgManager.load(url,
  svg_loading_done_callback,
  function() {
    console.log("Loading SVG...");
  },
  function() {
    console.log("Error loading SVG!");
  });

var camera, scene, renderer;

function init(svgObject) {
  camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 100000);
  camera.position.z = 1500;

  svgObject.position.x = Math.random() * innerWidth;
  svgObject.position.y = 200;
  svgObject.position.z = Math.random() * 10000 - 5000;
  svgObject.scale.x = svgObject.scale.y = svgObject.scale.z = 0.01;

  scene = new THREE.Scene();
  scene.add(svgObject);

  var ambient = new THREE.AmbientLight(0x80ffff);
  scene.add(ambient);
  var directional = new THREE.DirectionalLight(0xffff00);
  directional.position.set(-1, 0.5, 0);
  scene.add(directional);
  renderer = new THREE.SVGRenderer();
  renderer.setClearColor(0xf0f0f0);
  renderer.setSize(window.innerWidth, window.innerHeight - 5);
  document.body.appendChild(renderer.domElement);

  window.addEventListener('resize', onWindowResize, false);
}

function onWindowResize() {
  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();
  renderer.setSize(window.innerWidth, window.innerHeight);
}

function animate() {
  requestAnimationFrame(animate);
  render();
}

function render() {
  var time = Date.now() * 0.0002;
  camera.position.x = Math.sin(time) * 200;
  camera.position.z = Math.cos(time) * 200;
  camera.lookAt(scene.position);
  renderer.render(scene, camera);
}

＆＃13;

* {
  margin: 0
}

＆＃13;

<script src="http://threejs.org/build/three.min.js"></script>
<script src="http://threejs.org/examples/js/renderers/SVGRenderer.js"></script>
<script src="http://threejs.org/examples/js/renderers/Projector.js"></script>
<script src="http://threejs.org/examples/js/loaders/SVGLoader.js"></script>
<script>
  /**
   * @name LegacySVGLoader
   * @author mrdoob / http://mrdoob.com/
   * @author zz85 / http://joshuakoo.com/
   * @see https://github.com/mrdoob/three.js/issues/14387
   */

  THREE.LegacySVGLoader = function(manager) {

    this.manager = (manager !== undefined) ? manager : THREE.DefaultLoadingManager;

  };

  THREE.LegacySVGLoader.prototype = {

    constructor: THREE.LegacySVGLoader,

    load: function(url, onLoad, onProgress, onError) {

      var scope = this;

      var parser = new DOMParser();

      var loader = new THREE.FileLoader(scope.manager);
      loader.load(url, function(svgString) {

        var doc = parser.parseFromString(svgString, 'image/svg+xml'); // application/xml

        onLoad(doc.documentElement);

      }, onProgress, onError);

    }

  };
</script>

＆＃13;

Answer 2

这是最新的three.js库的当前答案：

https://threejs.org/examples/?q=svg#webgl_loader_svg

但是此代码将svg加载到几何体网格中，因此它不是DOM元素，它像其他任何3d对象一样缩小。它就像3d场景中的广告牌。如果有人需要这种行为，那就没事了。

如果您想将SVG加载为DOM元素，使其漂浮在3D场景上，能够添加鼠标单击和悬停事件...我问了一个例子，这里是：

https://github.com/mrdoob/three.js/issues/15528

如何在three.js

2 个答案: