fix the fall bug when using ToggleCollision

bullet/btKinematicCharacterController.cpp

@@ -140,6 +140,10 @@ btKinematicCharacterController::~btKinematicCharacterController ()
 {
 }
 
+void btKinematicCharacterController::setVerticalVelocity(float z)
+{
+    m_verticalVelocity = z;
+}
 
 bool btKinematicCharacterController::recoverFromPenetration( btCollisionWorld* collisionWorld )
 {

bullet/btKinematicCharacterController.h

@@ -101,6 +101,7 @@ public:
 
 	~btKinematicCharacterController ();
 
+    void setVerticalVelocity(float z);
 
 	///btActionInterface interface
 	virtual void updateAction( btCollisionWorld* collisionWorld, btScalar deltaTime )

bullet/physic.cpp

@@ -76,6 +76,7 @@ namespace Physic
     void PhysicActor::setGravity(float gravity)
     {
         mCharacter->setGravity(gravity);
+        //mCharacter->
     }
 
     void PhysicActor::enableCollisions(bool collision)
@@ -83,6 +84,11 @@ namespace Physic
         mCharacter->mCollision = collision;
     }
 
+    void PhysicActor::setVerticalVelocity(float z)
+    {
+        mCharacter->setVerticalVelocity(z);
+    }
+
     bool PhysicActor::getCollisionMode()
     {
         return mCharacter->mCollision;

bullet/physic.hpp

@@ -67,6 +67,8 @@ namespace Physic
 		void setRotation(const btQuaternion& quat);
 
         void setGravity(float gravity);
+        
+        void setVerticalVelocity(float z);
 
         void enableCollisions(bool collision);