我认为你必须看一下所谓的多物质对象。

I think you have to take a look at what is called a multi material object.

THREE.SceneUtils.createMultiMaterialObject( geometry, materials );

如果你谷歌那些你找到几个例子。像关于类似问题的答案。

If you google for those you find several examples. Like this answer on a similar question.

或者查看 THREE.MeshFaceMaterial 。您可以使用它为同一几何体分配多种材质。

Or take a look at THREE.MeshFaceMaterial. You can use it to assign multiple materials for the same geometry.

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

其中，材料是一系列材料，面部使用 materialIndex 获得指定正确材料的参数

Where materials is an array of materials and the faces use a materialIndex paramater to get appointed the right material

类似问题此处和这里

这是一个小提琴，以证明它是可能的。我使用了其中一个链接的代码。

Here is a fiddle to demonstrate that it is possible. I used the code from one of the links.