diff --git a/SpineViewer/Spine/Implementations/SpineObject/SpineObject21.cs b/SpineViewer/Spine/Implementations/SpineObject/SpineObject21.cs
index e0124c0..1ae8a7e 100644
--- a/SpineViewer/Spine/Implementations/SpineObject/SpineObject21.cs
+++ b/SpineViewer/Spine/Implementations/SpineObject/SpineObject21.cs
@@ -7,6 +7,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using SpineRuntime21;
+using SpineViewer.Extensions;
 using SpineViewer.Utils;
 
 namespace SpineViewer.Spine.Implementations.SpineObject
@@ -237,15 +238,13 @@ namespace SpineViewer.Spine.Implementations.SpineObject
             tmpSkeleton.Update(0);
             tmpSkeleton.UpdateWorldTransform();
 
-            // 切成 100 帧获取边界最大值
+            // 按 10 帧每秒计算边框
             var bounds = getCurrentBounds();
-            for (float tick = 0, delta = maxDuration / 100; tick < maxDuration; tick += delta)
+            float[] _ = [];
+            for (float tick = 0, delta = 0.1f; tick < maxDuration; tick += delta)
             {
                 tmpSkeleton.GetBounds(out var x, out var y, out var w, out var h);
-                if (x < bounds.X) bounds.X = x;
-                if (y < bounds.Y) bounds.Y = y;
-                if (w > bounds.Width) bounds.Width = w;
-                if (h > bounds.Height) bounds.Height = h;
+                bounds = bounds.Union(new(x, y, w, h));
                 tmpAnimationState.Update(delta);
                 tmpAnimationState.Apply(tmpSkeleton);
                 tmpSkeleton.Update(delta);
diff --git a/SpineViewer/Spine/Implementations/SpineObject/SpineObject36.cs b/SpineViewer/Spine/Implementations/SpineObject/SpineObject36.cs
index d900252..a2f7f72 100644
--- a/SpineViewer/Spine/Implementations/SpineObject/SpineObject36.cs
+++ b/SpineViewer/Spine/Implementations/SpineObject/SpineObject36.cs
@@ -7,6 +7,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using SpineRuntime36;
+using SpineViewer.Extensions;
 using SpineViewer.Utils;
 
 namespace SpineViewer.Spine.Implementations.SpineObject
@@ -237,16 +238,13 @@ namespace SpineViewer.Spine.Implementations.SpineObject
             tmpSkeleton.Update(0);
             tmpSkeleton.UpdateWorldTransform();
 
-            // 切成 100 帧获取边界最大值
+            // 按 10 帧每秒计算边框
             var bounds = getCurrentBounds();
             float[] _ = [];
-            for (float tick = 0, delta = maxDuration / 100; tick < maxDuration; tick += delta)
+            for (float tick = 0, delta = 0.1f; tick < maxDuration; tick += delta)
             {
                 tmpSkeleton.GetBounds(out var x, out var y, out var w, out var h, ref _);
-                if (x < bounds.X) bounds.X = x;
-                if (y < bounds.Y) bounds.Y = y;
-                if (w > bounds.Width) bounds.Width = w;
-                if (h > bounds.Height) bounds.Height = h;
+                bounds = bounds.Union(new(x, y, w, h));
                 tmpAnimationState.Update(delta);
                 tmpAnimationState.Apply(tmpSkeleton);
                 tmpSkeleton.Update(delta);
diff --git a/SpineViewer/Spine/Implementations/SpineObject/SpineObject37.cs b/SpineViewer/Spine/Implementations/SpineObject/SpineObject37.cs
index 9c75f93..1c4d8b9 100644
--- a/SpineViewer/Spine/Implementations/SpineObject/SpineObject37.cs
+++ b/SpineViewer/Spine/Implementations/SpineObject/SpineObject37.cs
@@ -4,6 +4,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using SpineRuntime37;
+using SpineViewer.Extensions;
 using SpineViewer.Utils;
 
 namespace SpineViewer.Spine.Implementations.SpineObject
@@ -208,16 +209,13 @@ namespace SpineViewer.Spine.Implementations.SpineObject
             tmpSkeleton.Update(0);
             tmpSkeleton.UpdateWorldTransform();
 
-            // 切成 100 帧获取边界最大值
+            // 按 10 帧每秒计算边框
             var bounds = getCurrentBounds();
             float[] _ = [];
-            for (float tick = 0, delta = maxDuration / 100; tick < maxDuration; tick += delta)
+            for (float tick = 0, delta = 0.1f; tick < maxDuration; tick += delta)
             {
                 tmpSkeleton.GetBounds(out var x, out var y, out var w, out var h, ref _);
-                if (x < bounds.X) bounds.X = x;
-                if (y < bounds.Y) bounds.Y = y;
-                if (w > bounds.Width) bounds.Width = w;
-                if (h > bounds.Height) bounds.Height = h;
+                bounds = bounds.Union(new(x, y, w, h));
                 tmpAnimationState.Update(delta);
                 tmpAnimationState.Apply(tmpSkeleton);
                 tmpSkeleton.Update(delta);
diff --git a/SpineViewer/Spine/Implementations/SpineObject/SpineObject38.cs b/SpineViewer/Spine/Implementations/SpineObject/SpineObject38.cs
index a1ff841..5c3b2ed 100644
--- a/SpineViewer/Spine/Implementations/SpineObject/SpineObject38.cs
+++ b/SpineViewer/Spine/Implementations/SpineObject/SpineObject38.cs
@@ -8,6 +8,7 @@ using System.Threading.Tasks;
 using System.Xml.Linq;
 using SpineRuntime38;
 using SpineRuntime38.Attachments;
+using SpineViewer.Extensions;
 using SpineViewer.Utils;
 
 namespace SpineViewer.Spine.Implementations.SpineObject
@@ -209,16 +210,13 @@ namespace SpineViewer.Spine.Implementations.SpineObject
             tmpSkeleton.Update(0);
             tmpSkeleton.UpdateWorldTransform();
 
-            // 切成 100 帧获取边界最大值
+            // 按 10 帧每秒计算边框
             var bounds = getCurrentBounds();
             float[] _ = [];
-            for (float tick = 0, delta = maxDuration / 100; tick < maxDuration; tick += delta)
+            for (float tick = 0, delta = 0.1f; tick < maxDuration; tick += delta)
             {
                 tmpSkeleton.GetBounds(out var x, out var y, out var w, out var h, ref _);
-                if (x < bounds.X) bounds.X = x;
-                if (y < bounds.Y) bounds.Y = y;
-                if (w > bounds.Width) bounds.Width = w;
-                if (h > bounds.Height) bounds.Height = h;
+                bounds = bounds.Union(new(x, y, w, h));
                 tmpAnimationState.Update(delta);
                 tmpAnimationState.Apply(tmpSkeleton);
                 tmpSkeleton.Update(delta);
diff --git a/SpineViewer/Spine/Implementations/SpineObject/SpineObject40.cs b/SpineViewer/Spine/Implementations/SpineObject/SpineObject40.cs
index df0c483..e2fb80e 100644
--- a/SpineViewer/Spine/Implementations/SpineObject/SpineObject40.cs
+++ b/SpineViewer/Spine/Implementations/SpineObject/SpineObject40.cs
@@ -6,6 +6,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using SpineRuntime40;
+using SpineViewer.Extensions;
 using SpineViewer.Utils;
 
 namespace SpineViewer.Spine.Implementations.SpineObject
@@ -204,16 +205,13 @@ namespace SpineViewer.Spine.Implementations.SpineObject
             tmpSkeleton.Update(0);
             tmpSkeleton.UpdateWorldTransform();
 
-            // 切成 100 帧获取边界最大值
+            // 按 10 帧每秒计算边框
             var bounds = getCurrentBounds();
             float[] _ = [];
-            for (float tick = 0, delta = maxDuration / 100; tick < maxDuration; tick += delta)
+            for (float tick = 0, delta = 0.1f; tick < maxDuration; tick += delta)
             {
                 tmpSkeleton.GetBounds(out var x, out var y, out var w, out var h, ref _);
-                if (x < bounds.X) bounds.X = x;
-                if (y < bounds.Y) bounds.Y = y;
-                if (w > bounds.Width) bounds.Width = w;
-                if (h > bounds.Height) bounds.Height = h;
+                bounds = bounds.Union(new(x, y, w, h));
                 tmpAnimationState.Update(delta);
                 tmpAnimationState.Apply(tmpSkeleton);
                 tmpSkeleton.Update(delta);
diff --git a/SpineViewer/Spine/Implementations/SpineObject/SpineObject41.cs b/SpineViewer/Spine/Implementations/SpineObject/SpineObject41.cs
index e13dada..20a6339 100644
--- a/SpineViewer/Spine/Implementations/SpineObject/SpineObject41.cs
+++ b/SpineViewer/Spine/Implementations/SpineObject/SpineObject41.cs
@@ -6,6 +6,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using SpineRuntime41;
+using SpineViewer.Extensions;
 using SpineViewer.Utils;
 
 namespace SpineViewer.Spine.Implementations.SpineObject
@@ -204,19 +205,15 @@ namespace SpineViewer.Spine.Implementations.SpineObject
             //tmpSkeleton.Update(0);
             tmpSkeleton.UpdateWorldTransform();
 
-            // 切成 100 帧获取边界最大值
+            // 按 10 帧每秒计算边框
             var bounds = getCurrentBounds();
             float[] _ = [];
-            for (float tick = 0, delta = maxDuration / 100; tick < maxDuration; tick += delta)
+            for (float tick = 0, delta = 0.1f; tick < maxDuration; tick += delta)
             {
                 tmpSkeleton.GetBounds(out var x, out var y, out var w, out var h, ref _);
-                if (x < bounds.X) bounds.X = x;
-                if (y < bounds.Y) bounds.Y = y;
-                if (w > bounds.Width) bounds.Width = w;
-                if (h > bounds.Height) bounds.Height = h;
+                bounds = bounds.Union(new(x, y, w, h));
                 tmpAnimationState.Update(delta);
                 tmpAnimationState.Apply(tmpSkeleton);
-                //tmpSkeleton.Update(delta);
                 tmpSkeleton.UpdateWorldTransform();
             }
 
diff --git a/SpineViewer/Spine/Implementations/SpineObject/Spineobject42.cs b/SpineViewer/Spine/Implementations/SpineObject/Spineobject42.cs
index 063c748..f76d50b 100644
--- a/SpineViewer/Spine/Implementations/SpineObject/Spineobject42.cs
+++ b/SpineViewer/Spine/Implementations/SpineObject/Spineobject42.cs
@@ -6,6 +6,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using SpineRuntime42;
+using SpineViewer.Extensions;
 using SpineViewer.Utils;
 
 namespace SpineViewer.Spine.Implementations.SpineObject
@@ -204,16 +205,13 @@ namespace SpineViewer.Spine.Implementations.SpineObject
             tmpSkeleton.Update(0);
             tmpSkeleton.UpdateWorldTransform(Skeleton.Physics.Update);
 
-            // 切成 100 帧获取边界最大值
+            // 按 10 帧每秒计算边框
             var bounds = getCurrentBounds();
             float[] _ = [];
-            for (float tick = 0, delta = maxDuration / 100; tick < maxDuration; tick += delta)
+            for (float tick = 0, delta = 0.1f; tick < maxDuration; tick += delta)
             {
                 tmpSkeleton.GetBounds(out var x, out var y, out var w, out var h, ref _);
-                if (x < bounds.X) bounds.X = x;
-                if (y < bounds.Y) bounds.Y = y;
-                if (w > bounds.Width) bounds.Width = w;
-                if (h > bounds.Height) bounds.Height = h;
+                bounds = bounds.Union(new(x, y, w, h));
                 tmpAnimationState.Update(delta);
                 tmpAnimationState.Apply(tmpSkeleton);
                 tmpSkeleton.Update(delta);