diff --git a/Source/SIMPLib/Math/GeometryMath.cpp b/Source/SIMPLib/Math/GeometryMath.cpp
index e8863f949..fa4bb8866 100644
--- a/Source/SIMPLib/Math/GeometryMath.cpp
+++ b/Source/SIMPLib/Math/GeometryMath.cpp
@@ -66,6 +66,19 @@ double GeometryMath::CosThetaBetweenVectors(const double a[3], const double b[3]
   }
   return (a[0] * b[0] + a[1] * b[1] + a[2] * b[2]) / (norm1 * norm2);
 }
+float GeometryMath::CosThetaBetweenVectors(const Eigen::Vector3f& vectorA, const Eigen::Vector3f& vectorB)
+{
+  const float normA = vectorA.norm();
+  const float normB = vectorB.norm();
+
+  if(normA == 0.0f || normB == 0.0f)
+  {
+    return 1.0f;
+  }
+
+  return vectorA.dot(vectorB) / (normA * normB);
+}
+
 // -----------------------------------------------------------------------------
 //
 // -----------------------------------------------------------------------------
diff --git a/Source/SIMPLib/Math/GeometryMath.h b/Source/SIMPLib/Math/GeometryMath.h
index 6a755761b..92e28d932 100644
--- a/Source/SIMPLib/Math/GeometryMath.h
+++ b/Source/SIMPLib/Math/GeometryMath.h
@@ -37,6 +37,8 @@
 
 #include <memory>
 
+#include <Eigen/Dense>
+
 #include "SIMPLib/SIMPLib.h"
 #include "SIMPLib/DataArrays/DynamicListArray.hpp"
 
@@ -62,6 +64,7 @@ namespace GeometryMath
  */
 SIMPLib_EXPORT float CosThetaBetweenVectors(const float a[3], const float b[3]);
 SIMPLib_EXPORT double CosThetaBetweenVectors(const double a[3], const double b[3]);
+SIMPLib_EXPORT float CosThetaBetweenVectors(const Eigen::Vector3f& vectorA, const Eigen::Vector3f& vectorB);
 
 /**
  * @brief Computes the angle in RADIANS between 2 vectors.