genesis-3d_engine/Engine/ExtIncludes/physX3/windows/particles/PxParticleFluid.h

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#ifndef PX_PHYSICS_NX_PARTICLEFLUID
#define PX_PHYSICS_NX_PARTICLEFLUID
/** \addtogroup particles
  @{
*/
#include "particles/PxParticleFluidReadData.h"
#include "particles/PxParticleBase.h"

#ifndef PX_DOXYGEN
namespace physx
{
#endif

/**
\brief The particle fluid class represents the main module for particle based fluid simulation.
SPH (Smoothed Particle Hydrodynamics) is used to animate the particles.  This class inherits the properties 
of the PxParticleBase class and adds particle-particle interactions. 

There are two kinds of particle interaction forces which govern the behaviour of the fluid:
<ol>
<li>
	Pressure forces: These forces result from particle densities higher than the
	"rest density" of the fluid.  The rest density is given by specifying the inter-particle
	distance at which the fluid is in its relaxed state.  Particles which are closer than
	the rest spacing are pushed away from each other.
<li>
	Viscosity forces:  These forces act on neighboring particles depending on the difference
	of their velocities.  Particles drag other particles with them which is used to simulate the
	viscous behaviour of the fluid.
</ol>

For a good introduction to SPH fluid simulation,
see http://www.matthiasmueller.info/publications/sca03.pdf

@see PxParticleBase, PxParticleFluidReadData
*/
class PxParticleFluid : public PxParticleBase
{

public:

/************************************************************************************************/

/** @name Particle Access and Manipulation
*/
//@{
	
	/**
	\brief Locks the particle data and provides the data descriptor for accessing the particles including fluid particle densities.
	@see PxParticleFluidReadData
	@see PxParticleBase::lockParticleReadData()
	*/
	virtual		PxParticleFluidReadData*		lockParticleFluidReadData()										= 0;

//@}
/************************************************************************************************/


/** @name Particle Fluid Parameters
*/
//@{

	/**
	\brief Returns the fluid stiffness.

	\return The fluid stiffness.
	*/
	virtual		PxReal							getStiffness()											const	= 0;

	/**
	\brief Sets the fluid stiffness (must be positive).

	\param stiffness The new fluid stiffness.
	*/
	virtual		void 							setStiffness(PxReal stiffness)									= 0;

	/**
	\brief Returns the fluid viscosity.

	\return The viscosity  of the fluid.
	*/
	virtual		PxReal							getViscosity()											const	= 0;

	/**
	\brief Sets the fluid viscosity (must be positive).

	\param viscosity The new viscosity of the fluid.
	*/
	virtual		void 							setViscosity(PxReal viscosity)									= 0;

//@}
/************************************************************************************************/

/** @name Particle Fluid Property Read Back
*/
//@{

	/**
	\brief Returns the typical distance of particles in the relaxed state of the fluid.

	\return Rest particle distance.
	*/
	virtual		PxReal							getRestParticleDistance()								const	= 0;

//@}
/************************************************************************************************/

/** @name Particle Fluid Parameters
*/
//@{

	/**
	\brief Sets the typical distance of particles in the relaxed state of the fluid.

	\param restParticleDistance The new restParticleDistance of the fluid.
	*/
	virtual		void							setRestParticleDistance(PxReal restParticleDistance)			= 0;

//@}
/************************************************************************************************/

		virtual		const char*					getConcreteTypeName() const					{	return "PxParticleFluid"; }
protected:

											PxParticleFluid(PxRefResolver& v) : PxParticleBase(v)		{}
	PX_INLINE								PxParticleFluid() : PxParticleBase() {}
	virtual									~PxParticleFluid() {}
	virtual		bool						isKindOf(const char* name)	const		{	return !strcmp("PxParticleFluid", name) || PxParticleBase::isKindOf(name);  }
};

PX_INLINE PxParticleFluid*			PxActor::isParticleFluid()				{ return is<PxParticleFluid>();	}
PX_INLINE const PxParticleFluid*	PxActor::isParticleFluid()		const	{ return is<PxParticleFluid>();	}


#ifndef PX_DOXYGEN
} // namespace physx
#endif

/** @} */
#endif