diff --git a/src/lib/viewport/glc_camera.cpp b/src/lib/viewport/glc_camera.cpp
index ed38fc04..d579b5f6 100644
--- a/src/lib/viewport/glc_camera.cpp
+++ b/src/lib/viewport/glc_camera.cpp
@@ -82,25 +82,20 @@ bool GLC_Camera::operator==(const GLC_Camera& other) const
 /////////////////////////////////////////////////////////////////////
 // Set Functions
 /////////////////////////////////////////////////////////////////////
-void GLC_Camera::orbit(GLC_Vector3d VectOldPoss, GLC_Vector3d VectCurPoss)
+void GLC_Camera::orbit(GLC_Vector3d vectOldPoss, GLC_Vector3d vectCurPoss)
 {
-	// Map Vectors
-	GLC_Matrix4x4 invMat(m_ModelViewMatrix);
-	invMat.invert();
-	VectOldPoss= invMat * VectOldPoss;
-	VectCurPoss= invMat * VectCurPoss;
-
 	// Compute rotation matrix
-	const GLC_Vector3d VectAxeRot(VectCurPoss ^ VectOldPoss);
-	// Check if rotation vector is not null
-	if (!VectAxeRot.isNull())
-	{  // Ok, is not null
-		const double Angle= acos(VectCurPoss * VectOldPoss);
-		const GLC_Matrix4x4 MatOrbit(VectAxeRot, Angle);
+    const GLC_Vector3d rotationAxis(vectCurPoss ^ vectOldPoss);
+    // Check if rotation axis is not null
+    if (!rotationAxis.isNull())
+    {
+        const double angle= acos(vectCurPoss * vectOldPoss);
+        const GLC_Matrix4x4 invMat(m_ModelViewMatrix.inverted());
+        const GLC_Matrix4x4 orbitMatrix(invMat * rotationAxis, angle);
 
 		// Camera transformation
-		m_Eye= (MatOrbit * (m_Eye - m_Target)) + m_Target;
-		m_VectUp= MatOrbit * m_VectUp;
+        m_Eye= (orbitMatrix * (m_Eye - m_Target)) + m_Target;
+        m_VectUp= orbitMatrix * m_VectUp;
 		createMatComp();
 	}
 
diff --git a/src/lib/viewport/glc_camera.h b/src/lib/viewport/glc_camera.h
index 6ec6dde8..c727c2c3 100644
--- a/src/lib/viewport/glc_camera.h
+++ b/src/lib/viewport/glc_camera.h
@@ -154,7 +154,7 @@ class GLC_LIB_EXPORT GLC_Camera : public QObject
 //////////////////////////////////////////////////////////////////////
 public:
 	//! Camera orbiting
-    void orbit(GLC_Vector3d VectOldPoss, GLC_Vector3d VectCurPoss);
+    void orbit(GLC_Vector3d vectOldPoss, GLC_Vector3d vectCurPoss);
 
 	//! panoramic movement
     void pan(GLC_Vector3d VectDep);
diff --git a/src/lib/viewport/glc_trackballmover.cpp b/src/lib/viewport/glc_trackballmover.cpp
index 766e3238..edc6aa0e 100644
--- a/src/lib/viewport/glc_trackballmover.cpp
+++ b/src/lib/viewport/glc_trackballmover.cpp
@@ -80,19 +80,21 @@ void GLC_TrackBallMover::init(const GLC_UserInput& userInput)
 // Move the camera
 bool GLC_TrackBallMover::move(const GLC_UserInput& userInput)
 {
-	const GLC_Vector3d VectCurOrbit(mapForTracking(static_cast<double>(userInput.x()), static_cast<double>(userInput.y())));
+    const double x= static_cast<double>(userInput.x());
+    const double y= static_cast<double>(userInput.y());
+
+    const GLC_Vector3d vectCurOrbit(mapForTracking(x, y));
 
 	// Update camera position (orbit)
-	GLC_Mover::m_pViewport->cameraHandle()->orbit(GLC_Mover::m_PreviousVector, VectCurOrbit);
+    GLC_Mover::m_pViewport->cameraHandle()->orbit(GLC_Mover::m_PreviousVector, vectCurOrbit);
 
 	// Update arcs of circle's positionning matrix
-	const GLC_Matrix4x4 MatRot(GLC_Mover::m_PreviousVector, VectCurOrbit);
-
-	GLC_Mover::m_MoverInfo.m_MatrixInfo.first()= MatRot;
+    const GLC_Matrix4x4 matRot(GLC_Mover::m_PreviousVector, vectCurOrbit);
+    GLC_Mover::m_MoverInfo.m_MatrixInfo.first()= matRot;
 	updateRepresentation();
 
 	// Previous vector become current vector
-	GLC_Mover::m_PreviousVector = VectCurOrbit;
+    GLC_Mover::m_PreviousVector = vectCurOrbit;
 
 	return true;
 }