add the material for mesh

[lixiaojiangw]

I want to add the material through the following code, but it does not work. How can I add the material? thank you
（The material is lost when exporting .ifc from SketchUp, after from .ifc convert to .xkt. so I want to add the material in this way)
const xktLoader = new XKTLoaderPlugin(viewer);
const sceneModel = xktLoader.load({
id: "myModel",
manifestSrc: "app/data/projects/test5/models/hongqi/model.manifest.json",
edges: true,
colorTextureEnabled:true
});
.....
sceneModel.on("loaded", () => {
var myMesh = viewer.scene.objects["2hN0_N64f4eBtacYJk9FSu"];
if(myMesh != null)
new Mesh(viewer.scene, {
geometry: new ReadableGeometry(viewer.scene, myMesh.geometry),
material: new SpecularMaterial(viewer.scene, {
// specular: [1.0, 0.0, 0.0],
normalMap: new Texture(viewer.scene, {
src: "assets/myMaterials/material_9.jpg"
})
})
});
.....
thank you.