/**
*   Physics Environment takes care of stepping the simulation and is a container for physics entities (rigidbodies,constraints, materials etc.)
*   A derived class may be able to 'construct' entities by loading and/or converting
*/
class PHY_IPhysicsEnvironment
{
   public:
      virtual      ~PHY_IPhysicsEnvironment();
      virtual   void      beginFrame() = 0;
      virtual void      endFrame() = 0;
      /// Perform an integration step of duration 'timeStep'.
      virtual   bool      proceedDeltaTime(double curTime,float timeStep)=0;
      virtual   void      setFixedTimeStep(bool useFixedTimeStep,float fixedTimeStep)=0;
      //returns 0.f if no fixed timestep is used
      virtual   float      getFixedTimeStep()=0;


      virtual   void      setGravity(float x,float y,float z)=0;

      virtual int         createConstraint(class PHY_IPhysicsController* ctrl,class PHY_IPhysicsController* ctrl2,PHY_ConstraintType type,
         float pivotX,float pivotY,float pivotZ,
         float axisX,float axisY,float axisZ)=0;
      virtual void      removeConstraint(int constraintid)=0;

      virtual PHY_IPhysicsController* rayTest(PHY_IPhysicsController* ignoreClient, float fromX,float fromY,float fromZ, float toX,float toY,float toZ,
                              float& hitX,float& hitY,float& hitZ,float& normalX,float& normalY,float& normalZ)=0;


      //Methods for gamelogic collision/physics callbacks
      //todo:
      virtual void addSensor(PHY_IPhysicsController* ctrl)=0;
      virtual void removeSensor(PHY_IPhysicsController* ctrl)=0;
      virtual void addTouchCallback(int response_class, PHY_ResponseCallback callback, void *user)=0;
      virtual void requestCollisionCallback(PHY_IPhysicsController* ctrl)=0;
      virtual PHY_IPhysicsController*   CreateSphereController(float radius,const PHY__Vector3& position) =0;
      virtual PHY_IPhysicsController* CreateConeController(float coneradius,float coneheight)=0;
      
};