diff --git a/examples/DeformableDemo/DeformableMultibody.cpp b/examples/DeformableDemo/DeformableMultibody.cpp
index 6a99e08db..5ffaefc36 100644
--- a/examples/DeformableDemo/DeformableMultibody.cpp
+++ b/examples/DeformableDemo/DeformableMultibody.cpp
@@ -49,7 +49,7 @@ static bool g_floatingBase = true;
 static float friction = 1.;
 class DeformableMultibody : public CommonMultiBodyBase
 {
-    btAlignedObjectArray<btDeformableLagrangianForce*> forces;
+    btAlignedObjectArray<btDeformableLagrangianForce*> m_forces;
 public:
 	DeformableMultibody(struct GUIHelperInterface* helper)
 		: CommonMultiBodyBase(helper)
@@ -229,11 +229,11 @@ void DeformableMultibody::initPhysics()
 
         btDeformableMassSpringForce* mass_spring = new btDeformableMassSpringForce(2, 0.01, false);
         getDeformableDynamicsWorld()->addForce(psb, mass_spring);
-        forces.push_back(mass_spring);
+        m_forces.push_back(mass_spring);
         
         btDeformableGravityForce* gravity_force =  new btDeformableGravityForce(gravity);
         getDeformableDynamicsWorld()->addForce(psb, gravity_force);
-        forces.push_back(gravity_force);
+        m_forces.push_back(gravity_force);
     }
 
 	m_guiHelper->autogenerateGraphicsObjects(m_dynamicsWorld);
@@ -257,11 +257,12 @@ void DeformableMultibody::exitPhysics()
 		delete obj;
 	}
     // delete forces
-    for (int j = 0; j < forces.size(); j++)
+    for (int j = 0; j < m_forces.size(); j++)
     {
-        btDeformableLagrangianForce* force = forces[j];
+        btDeformableLagrangianForce* force = m_forces[j];
         delete force;
     }
+    m_forces.clear();
 	//delete collision shapes
 	for (int j = 0; j < m_collisionShapes.size(); j++)
 	{
diff --git a/examples/DeformableDemo/DeformableRigid.cpp b/examples/DeformableDemo/DeformableRigid.cpp
index 576803cc8..3cbfba451 100644
--- a/examples/DeformableDemo/DeformableRigid.cpp
+++ b/examples/DeformableDemo/DeformableRigid.cpp
@@ -44,7 +44,7 @@
 ///Generally it is best to leave the rolling friction coefficient zero (or close to zero).
 class DeformableRigid : public CommonRigidBodyBase
 {
-    btAlignedObjectArray<btDeformableLagrangianForce*> forces;
+    btAlignedObjectArray<btDeformableLagrangianForce*> m_forces;
 public:
 	DeformableRigid(struct GUIHelperInterface* helper)
 		: CommonRigidBodyBase(helper)
@@ -240,11 +240,11 @@ void DeformableRigid::initPhysics()
         
         btDeformableMassSpringForce* mass_spring = new btDeformableMassSpringForce(2,0.01, false);
         getDeformableDynamicsWorld()->addForce(psb, mass_spring);
-        forces.push_back(mass_spring);
+        m_forces.push_back(mass_spring);
         
         btDeformableGravityForce* gravity_force =  new btDeformableGravityForce(gravity);
         getDeformableDynamicsWorld()->addForce(psb, gravity_force);
-        forces.push_back(gravity_force);
+        m_forces.push_back(gravity_force);
         // add a few rigid bodies
         Ctor_RbUpStack(1);
     }
@@ -269,11 +269,12 @@ void DeformableRigid::exitPhysics()
 		delete obj;
 	}
     // delete forces
-    for (int j = 0; j < forces.size(); j++)
+    for (int j = 0; j < m_forces.size(); j++)
     {
-        btDeformableLagrangianForce* force = forces[j];
+        btDeformableLagrangianForce* force = m_forces[j];
         delete force;
     }
+    m_forces.clear();
 	//delete collision shapes
 	for (int j = 0; j < m_collisionShapes.size(); j++)
 	{
diff --git a/examples/DeformableDemo/GraspDeformable.cpp b/examples/DeformableDemo/GraspDeformable.cpp
index 341f4c737..b5cc66626 100644
--- a/examples/DeformableDemo/GraspDeformable.cpp
+++ b/examples/DeformableDemo/GraspDeformable.cpp
@@ -59,7 +59,7 @@ static bool supportsJointMotor(btMultiBody* mb, int mbLinkIndex)
 
 class GraspDeformable : public CommonRigidBodyBase
 {
-    btAlignedObjectArray<btDeformableLagrangianForce*> forces;
+    btAlignedObjectArray<btDeformableLagrangianForce*> m_forces;
 public:
 	GraspDeformable(struct GUIHelperInterface* helper)
 		: CommonRigidBodyBase(helper)
@@ -359,15 +359,15 @@ void GraspDeformable::initPhysics()
         
         btDeformableMassSpringForce* mass_spring = new btDeformableMassSpringForce(.5,0.04, true);
         getDeformableDynamicsWorld()->addForce(psb, mass_spring);
-        forces.push_back(mass_spring);
+        m_forces.push_back(mass_spring);
         
         btDeformableGravityForce* gravity_force =  new btDeformableGravityForce(gravity);
         getDeformableDynamicsWorld()->addForce(psb, gravity_force);
-        forces.push_back(gravity_force);
+        m_forces.push_back(gravity_force);
         
         btDeformableNeoHookeanForce* neohookean = new btDeformableNeoHookeanForce(2,10);
         getDeformableDynamicsWorld()->addForce(psb, neohookean);
-        forces.push_back(neohookean);
+        m_forces.push_back(neohookean);
     }
     
 //    // create a piece of cloth
@@ -440,11 +440,13 @@ void GraspDeformable::exitPhysics()
 		delete obj;
 	}
     // delete forces
-    for (int j = 0; j < forces.size(); j++)
+    for (int j = 0; j < m_forces.size(); j++)
     {
-        btDeformableLagrangianForce* force = forces[j];
+        btDeformableLagrangianForce* force = m_forces[j];
         delete force;
     }
+    m_forces.clear();
+    
 	//delete collision shapes
 	for (int j = 0; j < m_collisionShapes.size(); j++)
 	{
diff --git a/examples/DeformableDemo/Pinch.cpp b/examples/DeformableDemo/Pinch.cpp
index 3685869a0..661698a06 100644
--- a/examples/DeformableDemo/Pinch.cpp
+++ b/examples/DeformableDemo/Pinch.cpp
@@ -56,7 +56,7 @@ struct TetraBunny
 
 class Pinch : public CommonRigidBodyBase
 {
-    btAlignedObjectArray<btDeformableLagrangianForce*> forces;
+    btAlignedObjectArray<btDeformableLagrangianForce*> m_forces;
 public:
 	Pinch(struct GUIHelperInterface* helper)
 		: CommonRigidBodyBase(helper)
@@ -339,15 +339,15 @@ void Pinch::initPhysics()
         
         btDeformableMassSpringForce* mass_spring = new btDeformableMassSpringForce(1,0.05);
         getDeformableDynamicsWorld()->addForce(psb, mass_spring);
-        forces.push_back(mass_spring);
+        m_forces.push_back(mass_spring);
         
         btDeformableGravityForce* gravity_force =  new btDeformableGravityForce(gravity);
         getDeformableDynamicsWorld()->addForce(psb, gravity_force);
-        forces.push_back(gravity_force);
+        m_forces.push_back(gravity_force);
         
         btDeformableNeoHookeanForce* neohookean = new btDeformableNeoHookeanForce(.2,1);
         getDeformableDynamicsWorld()->addForce(psb, neohookean);
-        forces.push_back(neohookean);
+        m_forces.push_back(neohookean);
         // add a grippers
         createGrip();
     }
@@ -372,11 +372,12 @@ void Pinch::exitPhysics()
 		delete obj;
 	}
     // delete forces
-    for (int j = 0; j < forces.size(); j++)
+    for (int j = 0; j < m_forces.size(); j++)
     {
-        btDeformableLagrangianForce* force = forces[j];
+        btDeformableLagrangianForce* force = m_forces[j];
         delete force;
     }
+    m_forces.clear();
 	//delete collision shapes
 	for (int j = 0; j < m_collisionShapes.size(); j++)
 	{
diff --git a/examples/DeformableDemo/VolumetricDeformable.cpp b/examples/DeformableDemo/VolumetricDeformable.cpp
index b6657de0c..cff07a175 100644
--- a/examples/DeformableDemo/VolumetricDeformable.cpp
+++ b/examples/DeformableDemo/VolumetricDeformable.cpp
@@ -51,7 +51,7 @@ struct TetraCube
 
 class VolumetricDeformable : public CommonRigidBodyBase
 {
-    btAlignedObjectArray<btDeformableLagrangianForce*> forces;
+    btAlignedObjectArray<btDeformableLagrangianForce*> m_forces;
 public:
 	VolumetricDeformable(struct GUIHelperInterface* helper)
 		: CommonRigidBodyBase(helper)
@@ -238,15 +238,15 @@ void VolumetricDeformable::initPhysics()
         
         btDeformableMassSpringForce* mass_spring = new btDeformableMassSpringForce(0,0.03);
         getDeformableDynamicsWorld()->addForce(psb, mass_spring);
-        forces.push_back(mass_spring);
+        m_forces.push_back(mass_spring);
         
         btDeformableGravityForce* gravity_force =  new btDeformableGravityForce(gravity);
         getDeformableDynamicsWorld()->addForce(psb, gravity_force);
-        forces.push_back(gravity_force);
+        m_forces.push_back(gravity_force);
         
         btDeformableNeoHookeanForce* neohookean = new btDeformableNeoHookeanForce(.5,2.5);
         getDeformableDynamicsWorld()->addForce(psb, neohookean);
-        forces.push_back(neohookean);
+        m_forces.push_back(neohookean);
         
     }
     // add a few rigid bodies
@@ -273,12 +273,13 @@ void VolumetricDeformable::exitPhysics()
 		delete obj;
 	}
     // delete forces
-    for (int j = 0; j < forces.size(); j++)
+    for (int j = 0; j < m_forces.size(); j++)
     {
-        btDeformableLagrangianForce* force = forces[j];
+        btDeformableLagrangianForce* force = m_forces[j];
         delete force;
     }
-
+    m_forces.clear();
+    
 	//delete collision shapes
 	for (int j = 0; j < m_collisionShapes.size(); j++)
 	{