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diff --git a/FTNoIR_Tracker_Base/ftnoir_tracker_types.h b/FTNoIR_Tracker_Base/ftnoir_tracker_types.h
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+/********************************************************************************
+* FaceTrackNoIR		This program is a private project of the some enthusiastic	*
+*					gamers from Holland, who don't like to pay much for			*
+*					head-tracking.												*
+*																				*
+* Copyright (C) 2010	Wim Vriend (Developing)									*
+*						Ron Hendriks (Researching and Testing)					*
+*																				*
+* Homepage																		*
+*																				*
+* 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/>.				*
+* This class implements a tracker-base											*
+*********************************************************************************/
+/*
+	Modifications (last one on top):
+		20110415 - WVR: Added overloaded operator - and -=
+*/
+#ifndef FTNOIR_TRACKER_TYPES_H
+#define FTNOIR_TRACKER_TYPES_H
+
+//
+// x,y,z position in centimetres, yaw, pitch and roll in degrees...
+//
+#pragma pack(push, 2)
+struct THeadPoseData {
+	double x, y, z, yaw, pitch, roll;
+	long frame_number;
+};
+#pragma pack(pop)
+
+//
+// Structure to hold all 6 DOF's
+//
+class T6DOF {
+public:
+	T6DOF( double x, double y, double z, 
+		   double yaw, double pitch, double roll ) {
+		position.x = x;
+		position.y = y;
+		position.z = z;
+		position.yaw = yaw;
+		position.pitch = pitch;
+		position.roll = roll;
+	}
+
+	void initHeadPoseData(){
+		position.x = 0.0f;
+		position.y = 0.0f;
+		position.z = 0.0f;
+		position.yaw = 0.0f;
+		position.pitch = 0.0f;
+		position.roll = 0.0f;
+		position.frame_number = 0;
+	}
+	T6DOF operator-( T6DOF &other ) {
+		return T6DOF(position.x - other.position.x, position.y - other.position.y, position.z - other.position.z,
+			         position.yaw - other.position.yaw, position.pitch - other.position.pitch, position.roll - other.position.roll);
+	}
+	T6DOF operator-=( T6DOF &other ) {
+		return T6DOF(position.x - other.position.x, position.y - other.position.y, position.z - other.position.z,
+			         position.yaw - other.position.yaw, position.pitch - other.position.pitch, position.roll - other.position.roll);
+	}
+	T6DOF operator+( T6DOF &other ) {
+		return T6DOF(position.x + other.position.x, position.y + other.position.y, position.z + other.position.z,
+			         position.yaw + other.position.yaw, position.pitch + other.position.pitch, position.roll + other.position.roll);
+	}
+	T6DOF operator+=( T6DOF &other ) {
+		return T6DOF(position.x + other.position.x, position.y + other.position.y, position.z + other.position.z,
+			         position.yaw + other.position.yaw, position.pitch + other.position.pitch, position.roll + other.position.roll);
+	}
+
+	THeadPoseData position;
+};
+
+#endif // FTNOIR_TRACKER_TYPES_H