The Gumball Problem

Scripting
, ,
1 
        protected override void OnMouseDown(Rhino.Input.Custom.GetPointMouseEventArgs e)
        {

            starting_point = e.Point;

            //RhinoApp.WriteLine($"测试打印,{starting_point}");

            if (m_dc.PickResult.Mode != Rhino.UI.Gumball.GumballMode.None)
                return; // 如果 Gumball 已经被选中，不做处理
            m_dc.PickResult.SetToDefault(); // 重置拾取结果

            // 构造一个拾取上下文
            Rhino.Input.Custom.PickContext pick_context = new Rhino.Input.Custom.PickContext();
            pick_context.View = e.Viewport.ParentView;               // 设置当前视图
            pick_context.PickStyle = Rhino.Input.Custom.PickStyle.PointPick; // 点选模式

            // 获取拾取变换矩阵
            var xform = e.Viewport.GetPickTransform(e.WindowPoint);
            pick_context.SetPickTransform(xform);

            // 获取射线（视锥线）
            Rhino.Geometry.Line pick_line;
            e.Viewport.GetFrustumLine(e.WindowPoint.X, e.WindowPoint.Y, out pick_line);
            pick_context.PickLine = pick_line; // 设置拾取线
            pick_context.UpdateClippingPlanes(); // 更新裁剪平面

            //检测是否选中了 Gumball，如果选中则更新约束
            m_dc.PickGumball(pick_context, this);

            st_bool = true;

            base.OnMouseDown(e);
        }

When using rays to determine whether Gumball is selected, errors always occur in the perspective view. This has been bothering me. Is there a better way to solve this problem?