完成下列功能:

1.板件显示
2.板件选中状态
3.标注显示
4.相机控制.

src/Material.ts

@@ -0,0 +1,13 @@
+import { MeshBasicMaterial, Color, LineBasicMaterial } from "three";
+
+//板件的材质,使用这个材质避免板件将线覆盖.
+export let boardMaterial = new MeshBasicMaterial({
+    color: new Color(0.8, 0.8, 0.8),
+    polygonOffset: true,
+    polygonOffsetFactor: 1, // positive value pushes polygon further away
+    polygonOffsetUnits: 1
+});
+
+//线框的材质
+export let edgeMaterial = new LineBasicMaterial({ linewidth: 2, color: new Color(0, 0, 0) });
+