three.js - 如何在three.js中覆盖GLTF Material

Question

我正在尝试创建一种动态方式来在 Three.js 中的 gltf 导入模型上显示太阳能数据。目的是将不同的纯色与模型的不同部分相关联，并能够关闭和打开它们。我目前的障碍是更改 gltf 中 Material 的颜色。

我曾尝试使用 ObjLoader 来代替我输入自己的 Material ，但这不起作用:/

这是我目前拥有的js:

        const gltfLoader = new THREE.GLTFLoader();
        gltfLoader.load('Building.glb', (gltf) => {
            const root = gltf.scene;
            scene.add(root);

            const box = new THREE.Box3().setFromObject(root);
            const boxSize = box.getSize(new THREE.Vector3()).length();
            const boxCenter = box.getCenter(new THREE.Vector3());

            frameArea(boxSize * 0.5, boxSize, boxCenter, camera);

            controls.maxDistance = boxSize * 10;
            controls.target.copy(boxCenter);
            controls.update();
          });


    function frameArea(sizeToFitOnScreen, boxSize, boxCenter, camera) {
        const halfSizeToFitOnScreen = sizeToFitOnScreen * 0.5;
        const halfFovY = THREE.Math.degToRad(camera.fov * .5);
        const distance = halfSizeToFitOnScreen / Math.tan(halfFovY);
        const direction = (new THREE.Vector3())
        .subVectors(camera.position, boxCenter)
        .multiply(new THREE.Vector3(1, 0, 1))
        .normalize();

        camera.position.copy(direction.multiplyScalar(distance).add(boxCenter));

        camera.near = boxSize / 100;
        camera.far = boxSize * 100;

        camera.updateProjectionMatrix();

        // point the camera to look at the center of the box
        camera.lookAt(boxCenter.x, boxCenter.y, boxCenter.z);
    }

    renderer = new THREE.WebGLRenderer({canvas: myCanvas, antialias: true});
    renderer.setClearColor(0x000000);
    renderer.setSize(window.innerWidth, window.innerHeight);
    document.body.appendChild( renderer.domElement );



    function resizeRendererToDisplaySize(renderer) {
        const canvas = renderer.domElement;
        const width = canvas.clientWidth;
        const height = canvas.clientHeight;
        const needResize = canvas.width !== width || canvas.height !== height;
        if (needResize) {
          renderer.setSize(width, height, false);
      }
      return needResize;
    }

    function render() {
        if (resizeRendererToDisplaySize(renderer)) {
            const canvas = renderer.domElement;
            camera.aspect = canvas.clientWidth / canvas.clientHeight;
             camera.updateProjectionMatrix();
            }
            renderer.render(scene, camera);
            requestAnimationFrame(render);
         }
         requestAnimationFrame(render);

Answer 1

加载器返回的 gltf.scene 结果是一个 THREE.Scene 实例——一旦你有了它，加载模型所使用的文件格式无关紧要。在这种情况下，您需要遍历该场景并更改其中任何网格的 Material 。 MeshStandardMaterial 和 Mesh 文档可能会有所帮助。

var model = gltf.scene;
var newMaterial = new THREE.MeshStandardMaterial({color: 0xff0000});
model.traverse((o) => {
  if (o.isMesh) o.material = newMaterial;
});

如果您需要更改纹理，请注意 GLTFLoader documentation 中的说明。