fix: 修改默认相机为正交相机

Views/UserControl/Viewport3D.xaml.cs

@@ -32,6 +32,7 @@ public partial class Viewport3D
         Viewport3Dx.ShowViewCube = false;
         Viewport3Dx.ShowCoordinateSystem = false;
         ViewportManager.SetViewport3D(Viewport3Dx);
+       
     }
     
     /// <summary>
@@ -129,7 +130,7 @@ 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
         // 获取当前相机
-        var camera = Viewport3Dx.Camera as HelixToolkit.Wpf.SharpDX.PerspectiveCamera;
+        var camera = Viewport3Dx.Camera as HelixToolkit.Wpf.SharpDX.OrthographicCamera;
         
         switch (directionName)
         {
@@ -187,7 +188,7 @@ public partial class Viewport3D
                 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 = Viewport3Dx.Camera as HelixToolkit.Wpf.SharpDX.PerspectiveCamera;
+                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.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);
@@ -211,7 +212,7 @@ public partial class Viewport3D
         var directionValue = (int)TbCustomizeRevolve.Value; // 旋转角度（单位：度）
 
         // 获取当前相机和模型中心
-        var camera = Viewport3Dx.Camera as HelixToolkit.Wpf.SharpDX.PerspectiveCamera;
+        var camera = Viewport3Dx.Camera as HelixToolkit.Wpf.SharpDX.OrthographicCamera;
         if (camera == null) return;
 
         var modelCenter = ViewportManager.CenterVector; // 模型中心
@@ -417,7 +418,7 @@ 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
                 // 获取当前相机
-                var camera = Viewport3Dx.Camera as HelixToolkit.Wpf.SharpDX.PerspectiveCamera;
+                var camera = Viewport3Dx.Camera as HelixToolkit.Wpf.SharpDX.OrthographicCamera;
                 camera.Position = new Point3D(center.X, center.Y - distance, center.Z); // 从底部看，Y轴负方向
                 camera.UpDirection = new Vector3D(0, 0, -1);
                 camera.LookDirection = new Vector3D(center.X - camera.Position.X, center.Y - camera.Position.Y, center.Z - camera.Position.Z);

Views/UserControl/ViewportData/Helper/ViewportHelperPro.cs

@@ -19,6 +19,7 @@ using PerspectiveCamera = HelixToolkit.Wpf.SharpDX.PerspectiveCamera;
 using System.Windows.Controls;
 using HelixToolkit.Wpf;
 using MeshBuilder = HelixToolkit.Wpf.SharpDX.MeshBuilder;
+using OrthographicCamera = HelixToolkit.Wpf.SharpDX.OrthographicCamera;
 
 
 namespace SparkClient.Views.UserControl.ViewportData.Helper;
@@ -1010,7 +1011,7 @@ public class ViewportHelperPro
     /// <param name="fieldOfView"></param>
     /// <param name="aspectRatio"></param>
     /// <returns></returns>
-    public static HelixToolkit.Wpf.SharpDX.PerspectiveCamera CalculateCamera(Vector3 positiveDirection, BoundingBox boundingBox, double fieldOfView = 45, double aspectRatio = 16.0 / 9.0)
+    public static HelixToolkit.Wpf.SharpDX.OrthographicCamera CalculateCamera(Vector3 positiveDirection, BoundingBox boundingBox, double fieldOfView = 45, double aspectRatio = 16.0 / 9.0)
     {
         // 单位化正方向
         var normalizedDirection = Vector3.Normalize(positiveDirection);
@@ -1031,12 +1032,13 @@ public class ViewportHelperPro
         
 
         // 创建并返回相机
-        return new HelixToolkit.Wpf.SharpDX.PerspectiveCamera
+        return new HelixToolkit.Wpf.SharpDX.OrthographicCamera
         {
             Position = cameraPosition.ToPoint3D(),
             LookDirection = lookDirection.ToVector3D(),
             UpDirection = new Vector3D(0, 1, 0), // 默认全局 Y 轴为上方向
-            FieldOfView = fieldOfView,
+            NearPlaneDistance = 0.1f,
+            FarPlaneDistance=1000
         };
     }
 
@@ -1446,7 +1448,7 @@ public class ViewportHelperPro
     {
         // 使用 HelixToolkit 的 Ray3D 和 Plane3D
         var Viewport = ViewportManager.GetViewport3D();
-        var camera = Viewport.Camera as PerspectiveCamera;
+        var camera = Viewport.Camera as OrthographicCamera;
 
         // 创建射线
         var ray = new Ray3D(