diff --git a/FDTD/engine_interface_cylindrical_fdtd.cpp b/FDTD/engine_interface_cylindrical_fdtd.cpp
new file mode 100644
index 0000000..df73e3f
--- /dev/null
+++ b/FDTD/engine_interface_cylindrical_fdtd.cpp
@@ -0,0 +1,79 @@
+/*
+*	Copyright (C) 2011 Thorsten Liebig (Thorsten.Liebig@gmx.de)
+*
+*	This program is free software: you can redistribute it and/or modify
+*	it under the terms of the GNU General Public License as published by
+*	the Free Software Foundation, either version 3 of the License, or
+*	(at your option) any later version.
+*
+*	This program is distributed in the hope that it will be useful,
+*	but WITHOUT ANY WARRANTY; without even the implied warranty of
+*	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*	GNU General Public License for more details.
+*
+*	You should have received a copy of the GNU General Public License
+*	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "engine_interface_cylindrical_fdtd.h"
+
+Engine_Interface_Cylindrical_FDTD::Engine_Interface_Cylindrical_FDTD(Operator* op, Engine* eng) : Engine_Interface_FDTD(op,eng)
+{
+	m_Op_Cyl = dynamic_cast<Operator_Cylinder*>(op);
+	if (m_Op_Cyl==NULL)
+	{
+		cerr << "Engine_Interface_Cylindrical_FDTD::Engine_Interface_Cylindrical_FDTD: Error: Operator is not a cylindrical operator! Exit!" << endl;
+		exit(1);
+	}
+}
+
+Engine_Interface_Cylindrical_FDTD::~Engine_Interface_Cylindrical_FDTD()
+{
+}
+
+double* Engine_Interface_Cylindrical_FDTD::GetHField(const unsigned int* pos, double* out) const
+{
+	if ((m_Op_Cyl->GetClosedAlpha()==false) || (m_InterpolType!=NODE_INTERPOLATE))
+		return Engine_Interface_FDTD::GetHField(pos, out);
+
+	unsigned int iPos[] = {pos[0],pos[1],pos[2]};
+
+	if (pos[1]==m_Op->GetNumberOfLines(1)-1)
+		iPos[1]=0;
+	return Engine_Interface_FDTD::GetHField(iPos, out);
+}
+
+double* Engine_Interface_Cylindrical_FDTD::GetRawInterpolatedField(const unsigned int* pos, double* out, int type) const
+{
+	if (m_Op_Cyl->GetClosedAlpha()==false)
+		return Engine_Interface_FDTD::GetRawInterpolatedField(pos,out,type);
+
+	unsigned int iPos[] = {pos[0],pos[1],pos[2]};
+
+	switch (m_InterpolType)
+	{
+	default:
+	case NO_INTERPOLATION:
+		return Engine_Interface_FDTD::GetRawInterpolatedField(pos,out,type);
+		break;
+	case NODE_INTERPOLATE:
+		for (int n=0; n<3; ++n)
+		{
+			if (pos[1]==0)
+				iPos[1]=m_Op->GetNumberOfLines(1)-1;
+			return Engine_Interface_FDTD::GetRawInterpolatedField(iPos,out,type);
+		}
+		break;
+	case CELL_INTERPOLATE:
+		for (int n=0; n<3; ++n)
+		{
+			if (pos[1]==m_Op->GetNumberOfLines(1)-1)
+				iPos[1]=0;
+			return Engine_Interface_FDTD::GetRawInterpolatedField(iPos,out,type);
+		}
+		break;
+	}
+
+	//! this should not happen
+	return Engine_Interface_FDTD::GetRawInterpolatedField(pos,out,type);
+}
diff --git a/FDTD/engine_interface_cylindrical_fdtd.h b/FDTD/engine_interface_cylindrical_fdtd.h
new file mode 100644
index 0000000..5df12eb
--- /dev/null
+++ b/FDTD/engine_interface_cylindrical_fdtd.h
@@ -0,0 +1,39 @@
+/*
+*	Copyright (C) 2011 Thorsten Liebig (Thorsten.Liebig@gmx.de)
+*
+*	This program is free software: you can redistribute it and/or modify
+*	it under the terms of the GNU General Public License as published by
+*	the Free Software Foundation, either version 3 of the License, or
+*	(at your option) any later version.
+*
+*	This program is distributed in the hope that it will be useful,
+*	but WITHOUT ANY WARRANTY; without even the implied warranty of
+*	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*	GNU General Public License for more details.
+*
+*	You should have received a copy of the GNU General Public License
+*	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "engine_interface_fdtd.h"
+#include "operator_cylinder.h"
+
+#ifndef ENGINE_INTERFACE_CYLINDRICAL_FDTD_H
+#define ENGINE_INTERFACE_CYLINDRICAL_FDTD_H
+
+class Engine_Interface_Cylindrical_FDTD : public Engine_Interface_FDTD
+{
+public:
+	Engine_Interface_Cylindrical_FDTD(Operator* op, Engine* eng);
+	virtual ~Engine_Interface_Cylindrical_FDTD();
+
+	virtual double* GetHField(const unsigned int* pos, double* out) const;
+
+protected:
+	Operator_Cylinder* m_Op_Cyl;
+
+	//! Internal method to get an interpolated field of a given type. (0: E, 1: J, 2: rotH)
+	virtual double* GetRawInterpolatedField(const unsigned int* pos, double* out, int type) const;
+};
+
+#endif // ENGINE_INTERFACE_CYLINDRICAL_FDTD_H
diff --git a/FDTD/engine_interface_fdtd.h b/FDTD/engine_interface_fdtd.h
index b2a72f8..8ef20bd 100644
--- a/FDTD/engine_interface_fdtd.h
+++ b/FDTD/engine_interface_fdtd.h
@@ -54,8 +54,10 @@ protected:
 	Operator* m_Op;
 	Engine* m_Eng;
 
-	double* GetRawInterpolatedField(const unsigned int* pos, double* out, int type) const;
-	double GetRawField(unsigned int n, const unsigned int* pos, int type) const;
+	//! Internal method to get an interpolated field of a given type. (0: E, 1: J, 2: rotH)
+	virtual double* GetRawInterpolatedField(const unsigned int* pos, double* out, int type) const;
+	//! Internal method to get a raw field of a given type. (0: E, 1: J, 2: rotH)
+	virtual double GetRawField(unsigned int n, const unsigned int* pos, int type) const;
 };
 
 #endif // ENGINE_INTERFACE_FDTD_H
diff --git a/openEMS.pro b/openEMS.pro
index 47fabca..77206b0 100644
--- a/openEMS.pro
+++ b/openEMS.pro
@@ -83,7 +83,8 @@ SOURCES += FDTD/engine.cpp \
     FDTD/excitation.cpp \
     FDTD/operator_cylindermultigrid.cpp \
     FDTD/engine_cylindermultigrid.cpp \
-	FDTD/engine_interface_fdtd.cpp
+	FDTD/engine_interface_fdtd.cpp \
+	FDTD/engine_interface_cylindrical_fdtd.cpp
 
 # FDTD/extensions source files
 SOURCES += FDTD/extensions/engine_extension.cpp \
@@ -143,7 +144,8 @@ HEADERS += FDTD/engine.h \
     FDTD/operator_multithread.h \
     FDTD/operator_cylindermultigrid.h \
     FDTD/engine_cylindermultigrid.h \
-	FDTD/engine_interface_fdtd.h
+	FDTD/engine_interface_fdtd.h \
+	FDTD/engine_interface_cylindrical_fdtd.h
 
 # FDTD/extensions header files
 HEADERS += FDTD/extensions/operator_extension.h \
diff --git a/openems.cpp b/openems.cpp
index 018a636..c4a3d09 100644
--- a/openems.cpp
+++ b/openems.cpp
@@ -27,6 +27,7 @@
 #include "FDTD/extensions/operator_ext_upml.h"
 #include "FDTD/extensions/operator_ext_lorentzmaterial.h"
 #include "FDTD/engine_interface_fdtd.h"
+#include "FDTD/engine_interface_cylindrical_fdtd.h"
 #include "Common/processvoltage.h"
 #include "Common/processcurrent.h"
 #include "Common/processfieldprobe.h"
@@ -278,6 +279,14 @@ bool openEMS::SetupBoundaryConditions(TiXmlElement* BC)
 	return true;
 }
 
+Engine_Interface_FDTD* openEMS::NewEngineInterface()
+{
+	Operator_Cylinder* op_cyl = dynamic_cast<Operator_Cylinder*>(FDTD_Op);
+	if (op_cyl)
+		return new Engine_Interface_Cylindrical_FDTD(FDTD_Op,FDTD_Eng);
+	return new Engine_Interface_FDTD(FDTD_Op,FDTD_Eng);
+}
+
 bool openEMS::SetupProcessing()
 {
 	//*************** setup processing ************//
@@ -310,21 +319,21 @@ bool openEMS::SetupProcessing()
 			{
 				if (pb->GetProbeType()==0)
 				{
-					ProcessVoltage* procVolt = new ProcessVoltage(new Engine_Interface_FDTD(FDTD_Op,FDTD_Eng));
+					ProcessVoltage* procVolt = new ProcessVoltage(NewEngineInterface());
 					proc=procVolt;
 				}
 				else if (pb->GetProbeType()==1)
 				{
-					ProcessCurrent* procCurr = new ProcessCurrent(new Engine_Interface_FDTD(FDTD_Op,FDTD_Eng));
+					ProcessCurrent* procCurr = new ProcessCurrent(NewEngineInterface());
 					proc=procCurr;
 				}
 				else if (pb->GetProbeType()==2)
-					proc = new ProcessFieldProbe(new Engine_Interface_FDTD(FDTD_Op,FDTD_Eng),0);
+					proc = new ProcessFieldProbe(NewEngineInterface(),0);
 				else if (pb->GetProbeType()==3)
-					proc = new ProcessFieldProbe(new Engine_Interface_FDTD(FDTD_Op,FDTD_Eng),1);
+					proc = new ProcessFieldProbe(NewEngineInterface(),1);
 				else if ((pb->GetProbeType()==10) || (pb->GetProbeType()==11))
 				{
-					ProcessModeMatch* pmm = new ProcessModeMatch(new Engine_Interface_FDTD(FDTD_Op,FDTD_Eng));
+					ProcessModeMatch* pmm = new ProcessModeMatch(NewEngineInterface());
 					pmm->SetFieldType(pb->GetProbeType()-10);
 					pmm->SetModeFunction(0,pb->GetAttributeValue("ModeFunctionX"));
 					pmm->SetModeFunction(1,pb->GetAttributeValue("ModeFunctionY"));
@@ -378,11 +387,11 @@ bool openEMS::SetupProcessing()
 			if (db)
 			{
 				if ((db->GetDumpType()>=0) && (db->GetDumpType()<=3))
-					ProcField = new ProcessFieldsTD(new Engine_Interface_FDTD(FDTD_Op,FDTD_Eng));
+					ProcField = new ProcessFieldsTD(NewEngineInterface());
 				else if ((db->GetDumpType()>=10) && (db->GetDumpType()<=13))
-					ProcField = new ProcessFieldsFD(new Engine_Interface_FDTD(FDTD_Op,FDTD_Eng));
+					ProcField = new ProcessFieldsFD(NewEngineInterface());
 				else if (db->GetDumpType()==20)
-					ProcField = new ProcessFieldsSAR(new Engine_Interface_FDTD(FDTD_Op,FDTD_Eng));
+					ProcField = new ProcessFieldsSAR(NewEngineInterface());
 				else
 					cerr << "openEMS::SetupFDTD: unknown dump box type... skipping!" << endl;
 				if (ProcField)
@@ -696,7 +705,7 @@ void openEMS::RunFDTD()
 	cout << "Running FDTD engine... this may take a while... grab a cup of coffee?!?" << endl;
 
 	//special handling of a field processing, needed to realize the end criteria...
-	ProcessFields* ProcField = new ProcessFields(new Engine_Interface_FDTD(FDTD_Op,FDTD_Eng));
+	ProcessFields* ProcField = new ProcessFields(NewEngineInterface());
 	PA->AddProcessing(ProcField);
 	double maxE=0,currE=0;
 
diff --git a/openems.h b/openems.h
index 746ec20..4797e08 100644
--- a/openems.h
+++ b/openems.h
@@ -30,6 +30,7 @@ class Engine_Interface_FDTD;
 class ProcessingArray;
 class TiXmlElement;
 class ContinuousStructure;
+class Engine_Interface_FDTD;
 
 double CalcDiffTime(timeval t1, timeval t2);
 string FormatTime(int sec);
@@ -63,6 +64,8 @@ public:
 	//! Check for abort conditions
 	bool CheckAbortCond();
 
+	Engine_Interface_FDTD* NewEngineInterface();
+
 protected:
 	bool CylinderCoords;