diff --git a/GodotHelper/GodotHelper.csproj b/GodotHelper/GodotHelper.csproj
index 5bcb511..76fb553 100644
--- a/GodotHelper/GodotHelper.csproj
+++ b/GodotHelper/GodotHelper.csproj
@@ -49,5 +49,6 @@
     </PackageReference>
     <PackageReference Include="GodotSharp" Version="4.6.2" />
     <PackageReference Include="SjkScripts" Version="1.0.15" />
+    <!-- [1.2.3,2.3.4] use range of versions -->
   </ItemGroup>
 </Project>
diff --git a/GodotHelper/src/Math/LerpVectors.cs b/GodotHelper/src/Math/LerpVectors.cs
index a05c006..c26e93c 100644
--- a/GodotHelper/src/Math/LerpVectors.cs
+++ b/GodotHelper/src/Math/LerpVectors.cs
@@ -8,7 +8,7 @@ public static partial class SJKMath
   //     Mathf.Lerp(from.Y, to.Y, weight),
   //     Mathf.Lerp(from.Z, to.Z, weight)
   // );
-  public static Vector3 Lerp(Vector3 from, Vector3 to, float weight) => new Vector3(
+  public static Vector3 Lerp(this Vector3 from, Vector3 to, float weight) => new Vector3(
       Mathf.Lerp(from.X, to.X, weight),
       Mathf.Lerp(from.Y, to.Y, weight),
       Mathf.Lerp(from.Z, to.Z, weight)
@@ -17,7 +17,7 @@ public static partial class SJKMath
   //     Mathf.Lerp(from.X, to.X, weight),
   //     Mathf.Lerp(from.Y, to.Y, weight)
   // );
-  public static Vector2 Lerp(Vector2 from, Vector2 to, float weight) => new Vector2(
+  public static Vector2 Lerp(this Vector2 from, Vector2 to, float weight) => new Vector2(
       Mathf.Lerp(from.X, to.X, weight),
       Mathf.Lerp(from.Y, to.Y, weight)
   );
diff --git a/GodotHelper/src/Math/RoundVectors.cs b/GodotHelper/src/Math/RoundVectors.cs
new file mode 100644
index 0000000..eca5870
--- /dev/null
+++ b/GodotHelper/src/Math/RoundVectors.cs
@@ -0,0 +1,33 @@
+namespace GodotHelpers;
+
+using Godot;
+public static partial class SJKMath
+{
+  public static Vector3I RoundToIntVector(this Vector3 vector) => new Vector3I(
+      Mathf.RoundToInt(vector.X),
+      Mathf.RoundToInt(vector.Y),
+      Mathf.RoundToInt(vector.Z)
+  );
+  public static Vector3I FloorToIntVector(this Vector3 vector) => new Vector3I(
+      Mathf.FloorToInt(vector.X),
+      Mathf.FloorToInt(vector.Y),
+      Mathf.FloorToInt(vector.Z)
+  );
+  public static Vector3I CeilToIntVector(this Vector3 vector) => new Vector3I(
+      Mathf.CeilToInt(vector.X),
+      Mathf.CeilToInt(vector.Y),
+      Mathf.CeilToInt(vector.Z)
+  );
+  public static Vector2I RoundToIntVector(this Vector2 vector) => new Vector2I(
+      Mathf.RoundToInt(vector.X),
+      Mathf.RoundToInt(vector.Y)
+  );
+  public static Vector2I FloorToIntVector(this Vector2 vector) => new Vector2I(
+      Mathf.FloorToInt(vector.X),
+      Mathf.FloorToInt(vector.Y)
+  );
+  public static Vector2I CeilToIntVector(this Vector2 vector) => new Vector2I(
+      Mathf.CeilToInt(vector.X),
+      Mathf.CeilToInt(vector.Y)
+  );
+}