threejs children下能得到geometry

回答: 在Three.js中，可以通过访问一个对象的`children`属性来获取其下的子对象。如果子对象是一个`Mesh`对象，那么可以通过访问其`geometry`属性来获取其几何体。例如，如果`obj`是一个包含子对象的Three.js对象，可以通过`obj.children\[0\].geometry`来获取第一个子对象的几何体。\[1\]
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相关问题

threejs obj

threejs obj模型加载可以通过加载.obj文件或同时加载.obj和.mtl文件来实现。加载.obj文件只加载模型的几何体信息，而不加载材质文件。可以使用THREE.OBJLoader()函数来加载.obj文件，示例如下：

var loader = new THREE.OBJLoader();
loader.load('./立方体/box.obj', function (obj) {
    console.log(obj);
    console.log(obj.children[0].material);
    scene.add(obj);
    obj.children[0].scale.set(20, 20, 20);
    obj.children[0].geometry.center();
    obj.children[0].material.color.set(0xff0000);
});

同时加载.obj文件和.mtl文件时，可以借助three.js引擎自定义材质对象Material。具体操作可以参考相关的Three.js课程第14章第3小节。

threejs remove

To remove an object from a Three.js scene, you can use the `remove()` method which is available in any object that inherits from `THREE.Object3D`. Here's an example:

// create a new mesh object
const mesh = new THREE.Mesh(geometry, material);

// add the mesh to the scene
scene.add(mesh);

// later, remove the mesh from the scene
scene.remove(mesh);

In this example, we first create a new mesh object and add it to the scene using the `add()` method. Then, when we want to remove the mesh from the scene, we call the `remove()` method on the scene and pass in the mesh object as an argument.

You can also remove all children from an object by calling the `remove()` method with no arguments:

// remove all children from the scene
scene.remove();

This will remove all objects that have been added to the scene.