更新选择框对BufferGeometry的支持,使用索引而不是判断点个数为3的倍数

src/Editor/SelectBase.ts

@@ -115,9 +115,9 @@ export class SelectSetBase
             else if (geo instanceof BufferGeometry)
             {
                 //由于threejs对buffGeometry转换错误.
-                let pos = geo.getAttribute("position");
-                if (pos.count % 3 !== 0)
+                if (!geo.index)// && pos.count % 3 !== 0
                 {
+                    let pos = geo.getAttribute("position");
                     for (let i = 0; i < pos.count * 3; i += 3)
                     {
                         let p = new Vector3(pos.array[i], pos.array[i + 1], pos.array[i + 2]);