diff --git a/ReflexToQ3/main.cpp b/ReflexToQ3/main.cpp
index 257ce81..e155347 100644
--- a/ReflexToQ3/main.cpp
+++ b/ReflexToQ3/main.cpp
@@ -11,42 +11,85 @@
 // Structs
 struct TPlanePoints
 {
-	TVector3f m_A;
-	TVector3f m_B;
-	TVector3f m_C;
+	Eigen::Vector3f m_A;
+	Eigen::Vector3f m_B;
+	Eigen::Vector3f m_C;
 	std::string m_material;
 };
 
-TPlanePoints GetPlanePoints(const TVector3f* _kpPoints, const size_t _kNumPoints)
+//-------------------------------------------------------+
+// Component functions of fn 'GetPlanePoints'
+
+// will need these functions to test whether the outputs used from Eigen 
+// are the same as the outputs from ckmath
+
+Eigen::Vector3f get_polygon_normal(const Eigen::Vector3f* vertices, const size_t nvertices) {
+    Eigen::Vector3f x = {0.0f, 0.0f, 0.0f};
+    for (size_t i = 0; i < nvertices; ++i) {
+		const size_t kIndexA = ((nvertices - 1) + i) % nvertices;
+		const size_t kIndexB = i;
+
+		const Eigen::Vector3f& krA = vertices[kIndexA];
+		const Eigen::Vector3f& krB = vertices[kIndexB];
+
+		const Eigen::Vector3f kCrossProduct = krA.cross(krB);
+        x += kCrossProduct;
+    }
+    x.normalize();
+    return x;
+}
+
+inline Eigen::Vector3f get_center(const Eigen::Vector3f* kppoints, 
+                                      const size_t npoints) {
+	Eigen::Vector3f result{0.0f, 0.0f, 0.0f};
+	for(size_t i = 0; i < npoints; ++i)
+	{
+		result += kppoints[i];
+	}
+    result *= (1.0f / (float)npoints);
+    return result;
+}
+
+inline float get_width(const Eigen::Vector3f* kppoints,
+                      const size_t npoints,
+                      const Eigen::Vector3f center) {
+	float width = 1.0f;
+	for(size_t i = 0; i < npoints; ++i) {
+        // norm() = vector magnitude in Eigen.
+		width = std::max(width, (kppoints[i] - center).norm());
+	}
+    return width;
+}
+
+inline Eigen::Vector3f get_tangent(const Eigen::Vector3f* x, 
+                                   float width) {
+    Eigen::Vector3f t = (x[1] - x[0]);
+    t.normalize();
+    return (t *  (width * 10.0f));
+}
+
+inline Eigen::Vector3f get_bitangent(const Eigen::Vector3f& tan, 
+                                     const Eigen::Vector3f& norm,
+                                     float width) {
+    Eigen::Vector3f x = norm.cross(tan);
+    x.normalize();
+    return (x * (width * 10.0f));
+}
+
+//-------------------------------------------------------+
+
+TPlanePoints GetPlanePoints(const Eigen::Vector3f* _kpPoints, const size_t _kNumPoints)
 {
 	TPlanePoints PlanePoints;
+	const Eigen::Vector3f kNormal  = get_polygon_normal(_kpPoints, _kNumPoints);
+	const Eigen::Vector3f kCenter  = get_center(_kpPoints, _kNumPoints);
+	float fWidth                   = get_width(_kpPoints, _kNumPoints, kCenter);
+	const Eigen::Vector3f kTangent   = get_tangent(_kpPoints, fWidth);
+	const Eigen::Vector3f kBiTangent = get_bitangent(kTangent, kNormal, fWidth);
 
-	// Find Normal
-	const TVector3f kNormal = GetPolygonNormal(TVector3f(), _kpPoints, _kNumPoints);
-
-	// Find center point
-	TVector3f Temp{0.0f, 0.0f, 0.0f};
-	for(size_t i = 0; i < _kNumPoints; ++i)
-	{
-		Temp = Add(Temp, Temp, _kpPoints[i]);
-	}
-	const TVector3f kCenter = ScalarMultiply(TVector3f(), Temp, (1.0f / (float)_kNumPoints));
-
-	float fWidth = 1.0f;
-	for(size_t i = 0; i < _kNumPoints; ++i)
-	{
-		fWidth = std::max(fWidth, VectorMagnitude(Subtract(TVector3f(), _kpPoints[i], kCenter)));
-	}
-
-	// Find Tangent
-	const TVector3f kTangent = ScalarMultiply(TVector3f(), Normalize(TVector3f(), Subtract(TVector3f(), _kpPoints[1], _kpPoints[0])), fWidth*10.0f);
-
-	// Find BiTangent
-	const TVector3f kBiTangent = ScalarMultiply(TVector3f(), Normalize(TVector3f(), CrossProduct(TVector3f(), kNormal, kTangent)), fWidth*10.0f);
-
-	PlanePoints.m_A = Add(TVector3f(), kCenter, kBiTangent);
+	PlanePoints.m_A = kCenter + kBiTangent;
 	PlanePoints.m_B = kCenter;
-	PlanePoints.m_C = Add(TVector3f(), kCenter, kTangent);
+	PlanePoints.m_C = kCenter + kTangent;
 
 	return(PlanePoints);
 }
@@ -56,7 +99,7 @@ std::vector<TPlanePoints> GetBrushPlanes(const TBrush& _krBrush)
 	std::vector<TPlanePoints> Planes;
 	for(const TFace& krFace : _krBrush.m_Faces)
 	{
-		std::vector<TVector3f> Verts(krFace.m_Indices.size());
+		std::vector<Eigen::Vector3f> Verts(krFace.m_Indices.size());
 		for(size_t i = 0; i < krFace.m_Indices.size(); ++i)
 		{
 			Verts[i] = _krBrush.m_Vertices[krFace.m_Indices[i]];
@@ -79,9 +122,9 @@ std::string GetBrushString(const TBrush& _krBrush)
 		ssOutput << "{" << std::endl;
 		for(const TPlanePoints& krPlane : Planes)
 		{
-			ssOutput << "( " << krPlane.m_A.m_fX << " " << krPlane.m_A.m_fZ << " " << krPlane.m_A.m_fY << " ) ";
-			ssOutput << "( " << krPlane.m_B.m_fX << " " << krPlane.m_B.m_fZ << " " << krPlane.m_B.m_fY << " ) ";
-			ssOutput << "( " << krPlane.m_C.m_fX << " " << krPlane.m_C.m_fZ << " " << krPlane.m_C.m_fY << " ) ";
+			ssOutput << "( " << krPlane.m_A[X] << " " << krPlane.m_A[Z] << " " << krPlane.m_A[Y] << " ) ";
+			ssOutput << "( " << krPlane.m_B[X] << " " << krPlane.m_B[Z] << " " << krPlane.m_B[Y] << " ) ";
+			ssOutput << "( " << krPlane.m_C[X] << " " << krPlane.m_C[Z] << " " << krPlane.m_C[Y] << " ) ";
 			if(krPlane.m_material.length())
 			{
 				ssOutput << krPlane.m_material << " 0 0 0 0.500000 0.500000" << std::endl;
@@ -134,4 +177,4 @@ int main(const int _kiArgC, const char** _kppcArgv)
 	}
 
 	return(0);
-}
+}
\ No newline at end of file