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similarity index 85%
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rename to 源代码/.Net/.vs/StgSharp/FileContentIndex/afc162e6-e0e6-4720-ac47-1dad9aa6de0b.vsidx
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diff --git a/源代码/.Net/.vs/StgSharp/v17/.suo b/源代码/.Net/.vs/StgSharp/v17/.suo
index c75ed1e3..c4fdb41d 100644
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diff --git a/源代码/.Net/StgSharp/Entities/IEntity.cs b/源代码/.Net/StgSharp/Entities/IEntity.cs
index 9407bfb0..ebe150f7 100644
--- a/源代码/.Net/StgSharp/Entities/IEntity.cs
+++ b/源代码/.Net/StgSharp/Entities/IEntity.cs
@@ -1,5 +1,4 @@
-using StgSharp;
-using StgSharp.Vector;
+using StgSharp.Math;
 using System;
 using System.Collections.Generic;
 using System.Text;
diff --git a/源代码/.Net/StgSharp/Entities/Launcher.cs b/源代码/.Net/StgSharp/Entities/Launcher.cs
index b2b11383..c9247062 100644
--- a/源代码/.Net/StgSharp/Entities/Launcher.cs
+++ b/源代码/.Net/StgSharp/Entities/Launcher.cs
@@ -6,6 +6,12 @@ namespace StgSharp
 {
     public class Launcher
     {
-        
+        internal Partical _bullet;
+
+        public Partical Bullet
+        {
+            get { return _bullet; }
+            set { _bullet = value; }
+        }
     }
 }
diff --git a/源代码/.Net/StgSharp/Entities/Partical.cs b/源代码/.Net/StgSharp/Entities/Partical.cs
index 3914e8bb..16dc2a68 100644
--- a/源代码/.Net/StgSharp/Entities/Partical.cs
+++ b/源代码/.Net/StgSharp/Entities/Partical.cs
@@ -1,4 +1,4 @@
-using StgSharp.Vector;
+using StgSharp.Math;
 using System;
 using System.Collections.Generic;
 using System.Text;
diff --git a/源代码/.Net/StgSharp/Vector/Vec2x1.cs b/源代码/.Net/StgSharp/Vector/Vec2D.cs
similarity index 97%
rename from 源代码/.Net/StgSharp/Vector/Vec2x1.cs
rename to 源代码/.Net/StgSharp/Vector/Vec2D.cs
index 3e4342c5..0b21d28a 100644
--- a/源代码/.Net/StgSharp/Vector/Vec2x1.cs
+++ b/源代码/.Net/StgSharp/Vector/Vec2D.cs
@@ -1,10 +1,9 @@
-using StgSharp.Math;
-using System;
+using System;
 using System.Collections.Generic;
 using System.Data.Common;
 using System.Text;
 
-namespace StgSharp.Vector
+namespace StgSharp.Math
 {
     public struct Vec2D:IEquatable<Vec2D>
     {
@@ -98,5 +97,6 @@ namespace StgSharp.Vector
         {
             return this.X * others.Y - this.Y * others.X;
         }
+
     }
 }
diff --git a/源代码/.Net/StgSharp/Vector/Vec3D.cs b/源代码/.Net/StgSharp/Vector/Vec3D.cs
new file mode 100644
index 00000000..2e179fe4
--- /dev/null
+++ b/源代码/.Net/StgSharp/Vector/Vec3D.cs
@@ -0,0 +1,112 @@
+using System;
+using System.Collections.Generic;
+using System.Data.Common;
+using System.Text;
+
+namespace StgSharp.Math
+{
+    public struct Vec3D : IEquatable<Vec3D>
+    {
+        public float X;
+        public float Y;
+        public float Z;
+
+        public Vec3D(float x, float y, float z)
+        {
+            X = x;
+            Y = y;
+            Z = z;
+        }
+
+        bool IEquatable<Vec3D>.Equals(Vec3D other)
+        {
+            if (this.GetHashCode() != other.GetHashCode())
+            {
+                return false;
+            }
+            else
+            {
+                return this.X == other.X 
+                    && this.Y == other.Y
+                    && this.Z == other.Z;
+            }
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj == null)
+            {
+                return false;
+            }
+            else if (obj.GetType() != typeof(Vec3D))
+            {
+                return false;
+            }
+            else
+            {
+                return this.Equals((Vec3D)obj);
+            }
+        }
+
+        public override int GetHashCode()
+        {
+            return HashCode.Combine(X, Y, Z);
+        }
+
+        public override string ToString()
+        {
+            return $"{X},{Y},{Z}";
+        }
+
+        public static bool operator ==(Vec3D vec1,Vec3D vec2)
+        {
+            return vec1.X == vec2.X 
+                && vec1.Y == vec2.Y 
+                && vec1.Z == vec2.Z;
+        }
+
+        public static bool operator !=(Vec3D vec1, Vec3D vec2)
+        {
+            return !(vec1.X == vec2.X 
+                && vec1.Y == vec2.Y 
+                && vec1.Z == vec2.Z);
+        }
+
+        public static Vec3D operator +(Vec3D vec1, Vec3D vec2)
+        {
+            return new Vec3D(
+                vec1.X + vec2.X,
+                vec1.Y + vec2.Y,
+                vec1.Z + vec2.Z
+                );
+        }
+
+        public static Vec3D operator -(Vec3D vec1, Vec3D vec2)
+        {
+            return new Vec3D(
+                vec1.X - vec2.X,
+                vec1.Y - vec2.Y,
+                vec1.Z - vec2.Z
+                );
+        }
+
+        public static Vec3D operator *(Vec3D vec, float x)
+        {
+            return new Vec3D(
+                vec.X * x,
+                vec.Y * x,
+                vec.Z * x
+                );
+        }
+
+        public static Vec3D operator /(Vec3D vec, float x)
+        {
+            return new Vec3D(
+                vec.X / x,
+                vec.Y / x,
+                vec.Z / x
+                );
+        }
+
+    }
+}