修正 选择`LineSegment`时错误的问题.

src/Editor/SelectBase.ts

@@ -1,4 +1,4 @@
-import { BufferGeometry, Face3, Frustum, Geometry, Matrix4, Object3D, PerspectiveCamera, Vector3, Line3 } from 'three';
+import { BufferGeometry, Face3, Frustum, Geometry, Line3, LineSegments, Matrix4, Object3D, PerspectiveCamera, Vector3 } from 'three';
 import { GetEntity, IsEntity } from '../Common/Utils';
 import { Entity } from '../DatabaseServices/Entity';
 import { IViewer } from '../GraphicsSystem/IView';
@@ -110,7 +110,7 @@ export class SelectSetBase
     {
         let pts: Array<Vector3> = [];
         let faces: Array<Face3> = [];
-        this.GetGeometrVerticesAndFaces(obj, pts, faces)
+        this.GetGeometrVerticesAndFaces(obj, pts, faces);
         return { pts, faces };
     }
     private GetGeometrVerticesAndFaces(obj: Object3D, pts: Vector3[], faces: Face3[])
@@ -191,9 +191,10 @@ export class SelectSetBase
             screenPts.push(p);
         }
 
-        if (faces.length == 0)
+        if (faces.length === 0)
         {
-            for (let index = 0; index < pts.length - 1; index++)
+            let add = (obj instanceof LineSegments) ? 2 : 1;
+            for (let index = 0; index < pts.length - 1; index += add)
             {
                 if (this.IntersectLineBase(index, index + 1, screenPts, pts))
                     return true;