fix:

Views/UserControl/Viewport3D.xaml.cs

@@ -65,6 +65,11 @@ public partial class Viewport3D
 #if DEBUG
         Viewport3Dx.ShowViewCube = true;
         Viewport3Dx.ShowCoordinateSystem = true;
+        Viewport3Dx.ShowCameraInfo = true;
+        Viewport3Dx.ShowCameraTarget = !Viewport3Dx.ShowCameraTarget;
+        Viewport3Dx.ShowFrameDetails = !Viewport3Dx.ShowFrameDetails;
+        Viewport3Dx.ShowFrameRate = !Viewport3Dx.ShowFrameRate;
+        Viewport3Dx.ShowTriangleCountInfo = !Viewport3Dx.ShowTriangleCountInfo;
 #endif
     }
     
@@ -188,7 +193,8 @@ public partial class Viewport3D
                 var maxDimension = ViewportManager.ModelBounds.Size.Length();
                 var distance = maxDimension *1.2; // 调整相机到模型的距离，保证视野范围内
                 var camera = Viewport3Dx.Camera as HelixToolkit.Wpf.SharpDX.OrthographicCamera;
-                camera.Position =  new Point3D(center.X, center.Y, center.Z + distance);  // 从前面看，Z轴正方向
+                camera.Position =  new Point3D(center.X, center.Y, center.Z);  // 从前面看，Z轴正方向
+                camera.Width = ViewportManager.calCameraWidth();
                 camera.UpDirection = new Vector3D(0, -1, 0);    
                 camera.LookDirection = new Vector3D(center.X -  camera.Position.X, center.Y -  camera.Position.Y, center.Z -  camera.Position.Z);
                 ViewportHelperPro.RotateModel(new Vector3D(0,-1,0));

Views/UserControl/ViewportData/Helper/VideoHelper.cs

@@ -199,8 +199,9 @@ public class VideoHelper
             var center = ViewportManager.ModelBounds.Center;
             var maxDimension = ViewportManager.ModelBounds.Size.Length();
             var distance = maxDimension *1.2; // 调整相机到模型的距离，保证视野范围内
-            var camera = ViewportManager.GetViewport3D().Camera as HelixToolkit.Wpf.SharpDX.PerspectiveCamera;
+            var camera = ViewportManager.GetViewport3D().Camera as HelixToolkit.Wpf.SharpDX.OrthographicCamera;
             camera.Position =  new Point3D(center.X, center.Y, center.Z + distance);  // 从前面看，Z轴正方向
+            camera.Width = ViewportManager.calCameraWidth();
             camera.UpDirection = new Vector3D(0, -1, 0);    
             camera.LookDirection = new Vector3D(center.X -  camera.Position.X, center.Y -  camera.Position.Y, center.Z -  camera.Position.Z);
             ViewportHelperPro.RotateModel(new Vector3D(0,-1,0));

Views/UserControl/ViewportData/Helper/ViewportHelperPro.cs

@@ -1031,6 +1031,7 @@ public class ViewportHelperPro
         var cameraPosition = center - normalizedDirection * (float)distance; // 沿正方向放置相机
         var lookDirection = center - cameraPosition;                        // 朝向模型中心
 
+        double width = ViewportManager.calCameraWidth();
 
         // 创建并返回相机
         return new HelixToolkit.Wpf.SharpDX.OrthographicCamera
@@ -1039,7 +1040,8 @@ public class ViewportHelperPro
             LookDirection = lookDirection.ToVector3D(),
             UpDirection = new Vector3D(0, 1, 0), // 默认全局 Y 轴为上方向
             NearPlaneDistance = 0.1f,
-            FarPlaneDistance=1000
+            FarPlaneDistance=1000,
+            Width = width
         };
     }
 

Views/UserControl/ViewportData/Helper/ViewportManager.cs

@@ -81,6 +81,9 @@ public class ViewportManager
 
     public static ColorConfigEntity ColorConfig = new ColorConfigEntity();
 
+    public static readonly double sacle = 1.875;
+
+
     /// <summary>
     /// 模型控件对象映射
     /// </summary>
@@ -432,7 +435,10 @@ public class ViewportManager
             _viewport.CameraMode = CameraMode.Inspect;
         }
     }
-
+    public static double calCameraWidth()
+    {
+        return ModelBounds.Size.Z * sacle;
+    }
     public static void ShowMeshLines(bool isShow,bool isCrown) {
         
         if (_viewport == null) return;