fix: 模型方向修复：俯仰限制90度

Views/UserControl/Viewport3D.xaml.cs

@@ -202,67 +202,56 @@ public partial class Viewport3D
     private void BtnDirection_OnClick(object sender, RoutedEventArgs e)
     {
         var directionName = ((Button)sender).Name.ToString();
-        var directionValue = (int)TbCustomizeRevolve.Value; 
+        var directionValue = (int)TbCustomizeRevolve.Value; // 旋转角度（单位：度）
 
-        if (directionValue == 0) return;
-        
+        // 获取当前相机和模型中心
         var camera = Viewport3Dx.Camera as HelixToolkit.Wpf.SharpDX.PerspectiveCamera;
         if (camera == null) return;
 
-        var modelCenter = ViewportManager.CenterVector; 
+        var modelCenter = ViewportManager.CenterVector; // 模型中心
         var currentPosition = camera.Position;
-        
+
+        // 将相机位置转换为极坐标
         var dx = currentPosition.X - modelCenter.X;
         var dy = currentPosition.Y - modelCenter.Y;
         var dz = currentPosition.Z - modelCenter.Z;
 
-        var radius = Math.Sqrt(dx * dx + dy * dy + dz * dz);
-        var azimuth = Math.Atan2(dz, dx) * 180.0 / Math.PI;
-        var elevation = Math.Atan2(dy, Math.Sqrt(dx * dx + dz * dz)) * 180.0 / Math.PI;
-        
+        var radius = Math.Sqrt(dx * dx + dy * dy + dz * dz); // 相机与模型中心的距离
+        var azimuth = Math.Atan2(dz, dx) * 180.0 / Math.PI;  // 方位角（水平平面上的角度）
+        var elevation = Math.Atan2(dy, Math.Sqrt(dx * dx + dz * dz)) * 180.0 / Math.PI; // 仰角（垂直方向的角度）
+
         switch (directionName)
         {
             case "BtnTop":
+                //上
                 elevation += directionValue;
                 break;
             case "BtnBottom":
+                //下
                 elevation -= directionValue;
                 break;
             case "BtnLeft":
+                //左
                 azimuth -= directionValue;
                 break;
             case "BtnRight":
+                //右
                 azimuth += directionValue;
                 break;
         }
-        if (elevation >= 90)
-        {
-            elevation = 89.9f; 
-            azimuth += 180.0f;  
-        }
-        else if (elevation <= -90)
-        {
-            elevation = -89.9f; 
-            azimuth += 180.0f; 
-        }
-        azimuth = (azimuth + 360) % 360;
-        
+        // 限制仰角范围在 -89.9 到 89.9 度，避免超出范围导致位置错误
+        elevation = Math.Clamp(elevation, -89.9, 89.9);
+        azimuth = (azimuth + 360) % 360; // 方位角在 0 到 360 范围内循环
+
+        // 将极坐标转换回直角坐标
         var newX = modelCenter.X + radius * Math.Cos(elevation * Math.PI / 180.0) * Math.Cos(azimuth * Math.PI / 180.0);
         var newY = modelCenter.Y + radius * Math.Sin(elevation * Math.PI / 180.0);
         var newZ = modelCenter.Z + radius * Math.Cos(elevation * Math.PI / 180.0) * Math.Sin(azimuth * Math.PI / 180.0);
-        
+
+        // 更新相机位置和视角
         camera.Position = new Point3D(newX, newY, newZ);
-        
         camera.LookDirection = new Vector3D(modelCenter.X - newX, modelCenter.Y - newY, modelCenter.Z - newZ);
-        
-        var rightDirection = Vector3D.CrossProduct(camera.LookDirection, new Vector3D(0, 1, 0));  // 计算右方向
-        
-        if (rightDirection.Length < 0.027) 
-        {
-            rightDirection = Vector3D.CrossProduct(camera.LookDirection, new Vector3D(-1, 0, 0)); // 计算右方向
-        }
-        
-        camera.UpDirection = Vector3D.CrossProduct(camera.LookDirection, rightDirection);
+        // camera.UpDirection = new Vector3D(0, 1, 0); // 保持 Y 轴为上方向
 
     }