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  #ifndef PX_PHYSICS_NX_PLANE_GEOMETRY
  #define PX_PHYSICS_NX_PLANE_GEOMETRY
  /** \addtogroup geomutils
  @{
  */
  #include "foundation/PxPlane.h"
  #include "foundation/PxTransform.h"
  #include "geometry/PxGeometry.h"
  
  #if !PX_DOXYGEN
  namespace physx
  {
  #endif
  
  /**
  \brief Class describing a plane geometry.
  
  The plane geometry specifies the half-space volume x<=0. As with other geometry types, 
  when used in a PxShape the collision volume is obtained by transforming the halfspace 
  by the shape local pose and the actor global pose.
  
  To generate a PxPlane from a PxTransform, transform PxPlane(1,0,0,0).
  
  To generate a PxTransform from a PxPlane, use PxTransformFromPlaneEquation.
  
  @see PxShape.setGeometry() PxShape.getPlaneGeometry() PxTransformFromPlaneEquation 
  */
  class PxPlaneGeometry : public PxGeometry 
  {
  public:
  	PX_INLINE PxPlaneGeometry() :	PxGeometry(PxGeometryType::ePLANE) {}
  
  	/**
  	\brief Returns true if the geometry is valid.
  
  	\return True if the current settings are valid
  	*/
  	PX_INLINE bool isValid() const;
  };
  
  
  PX_INLINE bool PxPlaneGeometry::isValid() const
  {
  	if (mType != PxGeometryType::ePLANE)
  		return false;
  
  	return true;
  }
  
  
  /** \brief creates a transform from a plane equation, suitable for an actor transform for a PxPlaneGeometry
  
  \param[in] plane the desired plane equation
  \return a PxTransform which will transform the plane PxPlane(1,0,0,0) to the specified plane
  */
  
  PX_FOUNDATION_API PxTransform PxTransformFromPlaneEquation(const PxPlane& plane);
  
  /** \brief creates a plane equation from a transform, such as the actor transform for a PxPlaneGeometry
  
  \param[in] transform the transform
  \return the plane
  */
  
  
  PX_INLINE PxPlane PxPlaneEquationFromTransform(const PxTransform& transform)
  {
  	return transform.transform(PxPlane(1.f,0.f,0.f,0.f));
  }
  
  
  #if !PX_DOXYGEN
  } // namespace physx
  #endif
  
  /** @} */
  #endif
  