axmol/extensions/3dparticle/ParticleUniverse/ParticleAffectors/CCPUParticle3DInterParticleCollider.cpp

/****************************************************************************
 Copyright (c) 2014 Chukong Technologies Inc.
 
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#include "CCPUParticle3DInterParticleCollider.h"
#include "3dparticle/ParticleUniverse/CCPUParticleSystem3D.h"

NS_CC_BEGIN

// Constants
const float PUParticle3DInterParticleCollider::DEFAULT_ADJUSTMENT = 1.0f;
const PUParticle3DInterParticleCollider::InterParticleCollisionResponse PUParticle3DInterParticleCollider::DEFAULT_COLLISION_RESPONSE = 
         PUParticle3DInterParticleCollider::IPCR_AVERAGE_VELOCITY;

//-----------------------------------------------------------------------
PUParticle3DInterParticleCollider::PUParticle3DInterParticleCollider(void) : 
    PUParticle3DBaseCollider(),
    _adjustment(DEFAULT_ADJUSTMENT),
    _interParticleCollisionResponse(DEFAULT_COLLISION_RESPONSE)
{
}

PUParticle3DInterParticleCollider::~PUParticle3DInterParticleCollider( void )
{

}
//-----------------------------------------------------------------------
float PUParticle3DInterParticleCollider::getAdjustment(void) const
{
    return _adjustment;
}
//-----------------------------------------------------------------------
void PUParticle3DInterParticleCollider::setAdjustment(float adjustment)
{
    _adjustment = adjustment;
}
//-----------------------------------------------------------------------
PUParticle3DInterParticleCollider::InterParticleCollisionResponse PUParticle3DInterParticleCollider::getInterParticleCollisionResponse(void) const
{
    return _interParticleCollisionResponse;
}
//-----------------------------------------------------------------------
void PUParticle3DInterParticleCollider::setInterParticleCollisionResponse(PUParticle3DInterParticleCollider::InterParticleCollisionResponse interParticleCollisionResponse)
{
    _interParticleCollisionResponse = interParticleCollisionResponse;
}
//-----------------------------------------------------------------------
void PUParticle3DInterParticleCollider::prepare()
{
    // Activate spatial hashing
    //particleTechnique->setSpatialHashingUsed(true);
}
//-----------------------------------------------------------------------
void PUParticle3DInterParticleCollider::unPrepare()
{
    // Deactivate spatial hashing
    //particleTechnique->setSpatialHashingUsed(false);
}
//-----------------------------------------------------------------------
bool PUParticle3DInterParticleCollider::validateAndExecuteSphereCollision (PUParticle3D* particle1, PUParticle3D* particle2, float timeElapsed)
{
    PUParticle3D* vp1 = static_cast<PUParticle3D*>(particle1);
    PUParticle3D* vp2 = static_cast<PUParticle3D*>(particle2);
    if ((vp1->position - vp2->position).length() < _adjustment * (vp1->radius + vp2->radius))
    {
        /** Collision detected.
        @remarks
            The collision response calculation isn't accurate, but gives an acceptable result.
        */
        Vec3 n = vp1->position - vp2->position;
        n.normalize();
        switch(_interParticleCollisionResponse)
        {
            case IPCR_AVERAGE_VELOCITY:
            {
                // Use average velocity; this keeps the particles in movement.
                float velocity1 = vp1->direction.length();
                float velocity2 = vp2->direction.length();
                float averageVelocity = 0.5f * (velocity1 + velocity2);
                vp1->direction = averageVelocity * vp2->mass * n;
                vp2->direction = averageVelocity * vp1->mass * -n;
            }
            break;

            case IPCR_ANGLE_BASED_VELOCITY:
            {
                // The new velocity is based on the angle between original direction and new direction.
                // Note, that this usually means that the velocity decreases.

                float velocity1 = Vec3(abs(vp1->direction.x), abs(vp1->direction.y), abs(vp1->direction.z)).dot(n);
                float velocity2 = Vec3(abs(vp2->direction.x), abs(vp2->direction.y), abs(vp2->direction.z)).dot(n);
                vp1->direction = velocity1 * vp2->mass * n;
                vp2->direction = velocity2 * vp1->mass * -n;
            }
            break;
        }
        vp1->direction *= _bouncyness;
        vp2->direction *= _bouncyness;
        vp1->addEventFlags(PUParticle3D::PEF_COLLIDED);
        vp2->addEventFlags(PUParticle3D::PEF_COLLIDED);
        return true;
    }

    return false;
}
//-----------------------------------------------------------------------

void PUParticle3DInterParticleCollider::updatePUAffector( PUParticle3D *particle, float deltaTime )
{
    //CCASSERT(0, "nonsupport yet");
    //for (auto iter : _particleSystem->getParticles())
    //{
    //    PUParticle3D *particle = iter;
    //     Fast rejection: only visible, moving particles are able to collide, unless they are colliding already
    //     Changed && into || in V1.3.1
    //    if (//particle->particleType != Particle::PT_VISUAL || 
    //        particle->hasEventFlags(PUParticle3D::PEF_COLLIDED) || 
    //        particle->direction == Vec3::ZERO)
    //    {
    //        return;
    //    }

    //    // Determine whether neighbour particles are colliding.
    //    SpatialHashTable<Particle*>* hashtable = particleTechnique->getSpatialHashTable();
    //    if (hashtable)
    //    {
    //    	SpatialHashTable<Particle*>::HashTableCell cell = hashtable->getCell(particle->position);
    //    	if (cell.empty())
    //    		return;

    //    	unsigned int size = static_cast<unsigned int>(cell.size());
    //    	for (unsigned int i = 0; i < size; ++i)
    //    	{
    //    		Particle* p = cell[i];

    //    		// Don't check if it is the same particle or the particle is already colliding.
    //    		if (particle != p  && !p->hasEventFlags(PUParticle3D::PEF_COLLIDED))
    //    		{
    //    			// Check for collision
    //    			if (validateAndExecuteSphereCollision(particle, p, deltaTime))
    //    			{
    //    				return;
    //    			}
    //    		}
    //    	}
    //    }
    //}
}

PUParticle3DInterParticleCollider* PUParticle3DInterParticleCollider::create()
{
    auto pipc = new PUParticle3DInterParticleCollider();
    pipc->autorelease();
    return pipc;
}

NS_CC_END