用于渲染开挖的结果

     SampleCode:

         //遮挡设置
         occlusionHelper = arView.getOcclusionHelper();
         occlusionHelper.init(0.36f)
         .setRenderMode(OcclusionHelper.RenderMode.NORMAL);

         //采用ARGeoPrism，构建“检测墙”
         List roomBounds = Arrays.asList(
                 new Point3D(-1, -1, -2),
                 new Point3D(-1, 6, -2),
                 new Point3D(6, 6, -2),
                 new Point3D(6, -1, -2),
                 new Point3D(-1, -1, -2)
         );
         ARGeoPrism geoVerticalRegion = new ARGeoPrism();
         geoVerticalRegion.setParentNode(arView);
         geoVerticalRegion.setRenderable(false);//不渲染出来，仅用作射线检测
         geoVerticalRegion.addPart(roomBounds,6.0f);

         //创建开挖工具,在这之前，需确认AREffectView开启了遮挡设置
         //Excavator所有子类使用方法一致
         excavatorWall = new WallExcavator(geoVerticalRegion);

         //坑洞纹理
         Bitmap bitmap=null;
         Bitmap bitmap2=null;
         try {
             InputStream is = getApplicationContext().getAssets()
                  .open("brown_mud_dry2.png");
             bitmap= BitmapFactory.decodeStream(is);
             InputStream is2 = getApplicationContext().getAssets()
                  .open("wall_texture.png");
             bitmap2= BitmapFactory.decodeStream(is2);
             is.close();
             is2.close();
         } catch (IOException e) {
         }
         //创建坑洞渲染对象
         pitWall = new PitObject(excavatorWall)
              .setTexture(bitmap,bitmap2);

        //在每一帧刷新时调用
        （通常使用
        EffectView.addOnUpdateListener(EffectView.OnUpdateListener)
        添加帧监听事件）
        arView.addOnUpdateListener(()->{
           if (occlusionHelper.isEnabled()){
             //desc-执行画面裁剪
             ArrayList screenPoint = null;
             if (excavatorWall !=null){
                 //计算屏幕坐标
                 screenPoint = excavatorWall.getScreenPoint(null);
                 if (screenPoint!=null){
                     //根据屏幕坐标刷新裁剪范围
                     occlusionHelper.setUniquePointList(screenPoint).refresh();
                     dynamicView.updateLine(screenPoint);
                 }
             }
         }
        })

        //开挖计算墙面碰撞点 arView为AREffectView、screenPointX/Y为对应的屏幕坐标
        //若要实时以屏幕中心计算碰撞点，则将下列代码放入EffectView.OnUpdateListener中
         Point3D hitPoint = excavatorWall
              .generateHitPoint(arView, screenPointX, screenPointY;
         if (hitPoint!=null){
             //desc-执行开挖的顶点计算(开挖参数)
             excavatorWall.calculate(ExcavationParameter.builder()
                     .setRadius(radius)
                     .setOffset(offset)
                     .setInnerMargin(0)
                     .setCenterPoint(hitPoint)
                     .build());
         }
         //渲染坑洞结果
         pitWall.updateMesh();