diff --git a/Simulations/MassSpringSystemSimulator.cpp b/Simulations/MassSpringSystemSimulator.cpp
index 4ce7d5f..c9e8026 100644
--- a/Simulations/MassSpringSystemSimulator.cpp
+++ b/Simulations/MassSpringSystemSimulator.cpp
@@ -101,7 +101,7 @@ void MassSpringSystemSimulator::notifyCaseChanged(int testCase)
 		//calculate Midpoint for one step and print results
 		setIntegrator(MIDPOINT);
 		cout << "\n\n\t -- MIDPOINT RESULT --\n";
-		simulateTimestep(0.005);
+		simulateTimestep(1);
 		printSpring(springs.at(0));
 		break;
 	}
@@ -188,16 +188,13 @@ void MassSpringSystemSimulator::simulateTimestep(float timeStep)
 			springs.erase(springs.begin() + i);
 			continue;
 		}
-		auto mp1 = sp.mp1.lock();
-		auto mp2 = sp.mp2.lock();
-
 
 		if (m_iIntegrator == EULER) {
 
-			Euler(*mp1.get(), *mp2.get(), sp, timeStep);
+			Euler(sp, timeStep);
 		}
 		else if (m_iIntegrator == MIDPOINT) {
-			//TODO: Add Midpoint
+			Midpoint(sp, timeStep);
 		}
 		else if (m_iIntegrator == LEAPFROG) {
 			//TODO: Add Leapfrog
@@ -283,15 +280,26 @@ Vec3 MassSpringSystemSimulator::getVelocityOfMassPoint(int index)
 
 void MassSpringSystemSimulator::applyExternalForce(Vec3 force)
 {
-
+	//eine Vorstellung: for all Masspoints, update force
 }
 
-Vec3 MassSpringSystemSimulator::calcualtePositionTimestepEuler(Vec3 oldPosition, float timestep, Vec3 velocity)
+int MassSpringSystemSimulator::LengthCalculator(Vec3 position1, Vec3 position2) {
+
+	Vec3 PosVector = position1 - position2;
+	//wurzel aus Vektor
+	int length = sqrt(pow(PosVector.x, 2) + pow(PosVector.y, 2) + pow(PosVector.z, 2));
+	
+	return length;
+}
+
+
+
+Vec3 MassSpringSystemSimulator::calculatePositionTimestepEuler(Vec3 oldPosition, float timestep, Vec3 velocity)
 {
 	return oldPosition + timestep * velocity;
 }
 
-Vec3 MassSpringSystemSimulator::calcualteVelocityTimestepEuler(Vec3 oldVelocity, float timestep, Vec3 acceleration)
+Vec3 MassSpringSystemSimulator::calculateVelocityTimestepEuler(Vec3 oldVelocity, float timestep, Vec3 acceleration)
 {
 	return oldVelocity + acceleration * timestep;
 }
@@ -301,10 +309,59 @@ Vec3 MassSpringSystemSimulator::calculateAcceleration(Vec3 force, float mass)
 	return force / mass;
 }
 
-void MassSpringSystemSimulator::Euler(MassPoint& masspoint1, MassPoint& masspoint2, Spring& spring, float timestep)
+void MassSpringSystemSimulator::Midpoint(Spring& spring, float timestep) {
+	//here some implementation about Midpoint
+	auto massPoint1 = spring.mp1.lock();
+	auto massPoint2 = spring.mp2.lock();
+
+	//old position
+	auto mp = massPoint1->position;
+	auto mp2 = massPoint2->position;
+	//old Velocity
+	auto mOld_v = massPoint1->velocity;
+	auto m2Old_v = massPoint2->velocity;
+
+	Vec3 PosVector = mp - mp2;
+	//Abstand ausrechnen
+	int d = LengthCalculator(mp, mp2);
+	//normalize
+	Vec3 PosNorm1 = PosVector / d;
+	Vec3 PosNorm2 = -1 * PosNorm1;
+
+	Vec3 Force = -m_fStiffness * (d - springs.at(0).initialLength) * PosNorm1;
+	Vec3 Force2 = -1 * Force;
+
+	Vec3 oldAcc = calculateAcceleration(Force,m_fMass);
+	Vec3 oldAcc2 = calculateAcceleration(Force2, m_fMass);
+
+	//Midpoint calculator
+	//Pos of Midstep
+	Vec3 PosOfMidstep = mp + 0.5 * timestep * mOld_v;
+	Vec3 PosOfMidstep2 = mp2 + 0.5 * timestep * m2Old_v;
+	//Vel at Midstep
+	Vec3 VelAtMidstep = mOld_v + 0.5 * timestep * oldAcc;
+	Vec3 VelAtMidstep2 = m2Old_v + 0.5 * timestep * oldAcc2;
+	
+	Vec3 NewPos = mp + timestep * VelAtMidstep;
+	Vec3 NewPos2 = mp2 + timestep * VelAtMidstep2;
+
+	Vec3 NewVel = mOld_v + timestep * oldAcc;
+	Vec3 NewVel2 = m2Old_v + timestep * oldAcc2;
+	//cout << NewPos;
+	//cout << NewVel;
+	massPoint1->position = NewPos;
+	massPoint1->velocity = NewVel;
+	massPoint2->position = NewPos2;
+	massPoint2->velocity = NewVel2;
+}
+
+void MassSpringSystemSimulator::Euler(Spring& spring, float timestep)
 {
+	auto massPoint1 = spring.mp1.lock();
+	auto massPoint2 = spring.mp2.lock();
+
 	//take old position and send to calculatePositionTimestepEuler
-	auto PosVector = masspoint1.position - masspoint2.position;
+	auto PosVector = massPoint1->position - massPoint2->position;
 	auto lengthVector = sqrt(PosVector.x * PosVector.x + PosVector.y * PosVector.y + PosVector.z * PosVector.z);
 	auto normalized = PosVector / lengthVector;
 
@@ -312,18 +369,18 @@ void MassSpringSystemSimulator::Euler(MassPoint& masspoint1, MassPoint& masspoin
 	// Force of spring is -k * (l - L) * normalizedVector [for P2 we can take -F1)
 	auto force = -m_fStiffness * (lengthVector - spring.initialLength) * normalized;
 	auto foreP2 = -1 * force;
-	auto veloc = calcualteVelocityTimestepEuler(masspoint1.velocity, timestep, calculateAcceleration(force, 10.));
-	auto pos = calcualtePositionTimestepEuler(masspoint1.position, timestep, veloc);
+	auto veloc = calculatePositionTimestepEuler(massPoint1->velocity, timestep, calculateAcceleration(force, 10.));
+	auto pos = calculatePositionTimestepEuler(massPoint1->position, timestep, veloc);
 
-	auto veloc2 = calcualteVelocityTimestepEuler(masspoint2.velocity, timestep, calculateAcceleration(foreP2, 10.));
-	auto pos2 = calcualtePositionTimestepEuler(masspoint2.position, timestep, veloc2);
+	auto veloc2 = calculateVelocityTimestepEuler(massPoint2->velocity, timestep, calculateAcceleration(foreP2, 10.));
+	auto pos2 = calculatePositionTimestepEuler(massPoint2->position, timestep, veloc2);
 
 	// Update Positions and Velocity
-	masspoint1.position = pos;
-	masspoint1.velocity = veloc;
+	massPoint1->position = pos;
+	massPoint1->velocity = veloc;
 
-	masspoint2.position = pos2;
-	masspoint2.velocity = veloc2;
+	massPoint2->position = pos2;
+	massPoint2->velocity = veloc2;
 }
 
 void MassSpringSystemSimulator::printSpring(const Spring& spring)
diff --git a/Simulations/MassSpringSystemSimulator.h b/Simulations/MassSpringSystemSimulator.h
index 520ed02..c2f4878 100644
--- a/Simulations/MassSpringSystemSimulator.h
+++ b/Simulations/MassSpringSystemSimulator.h
@@ -39,10 +39,13 @@ public:
 	Vec3 getVelocityOfMassPoint(int index);
 	void applyExternalForce(Vec3 force);
 
-	Vec3 calcualtePositionTimestepEuler(Vec3 oldPosition, float timestep, Vec3 veloctiy);
-	Vec3 calcualteVelocityTimestepEuler(Vec3 oldVelocity, float timestep, Vec3 acceleration);
+	void Midpoint(Spring& spring, float timestep);
+	int LengthCalculator(Vec3 position1, Vec3 position2);
+
+	Vec3 calculatePositionTimestepEuler(Vec3 oldPosition, float timestep, Vec3 veloctiy);
+	Vec3 calculateVelocityTimestepEuler(Vec3 oldVelocity, float timestep, Vec3 acceleration);
 	Vec3 calculateAcceleration(Vec3 acceleration, float mass);
-	void Euler(MassPoint& masspoint1, MassPoint& masspoint2, Spring& spring, float timestep);
+	void Euler(Spring& spring, float timestep);
 
 	void printSpring(const Spring& spring);