axmol/extensions/Particle3D/ParticleUniverse/ParticleAffectors/CCPUParticle3DSphereCollider.cpp

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#include "CCPUParticle3DSphereCollider.h"
#include "extensions/Particle3D/ParticleUniverse/CCPUParticleSystem3D.h"

NS_CC_BEGIN
// Constants
const float PUParticle3DSphereCollider::DEFAULT_RADIUS = 100.0f;

//-----------------------------------------------------------------------
PUParticle3DSphereCollider::PUParticle3DSphereCollider(void) : 
    PUParticle3DBaseCollider(),
    _predictedPosition(Vec3::ZERO),
    _radius(DEFAULT_RADIUS),
    _innerCollision(false)
{
}

PUParticle3DSphereCollider::~PUParticle3DSphereCollider( void )
{

}

//-----------------------------------------------------------------------
const float PUParticle3DSphereCollider::getRadius(void) const
{
    return _radius;
}
//-----------------------------------------------------------------------
void PUParticle3DSphereCollider::setRadius(const float radius)
{
    _radius = radius;
    _sphere.setRadius(_radius);
}
//-----------------------------------------------------------------------
bool PUParticle3DSphereCollider::isInnerCollision(void) const
{
    return _innerCollision;
}
//-----------------------------------------------------------------------
void PUParticle3DSphereCollider::setInnerCollision(bool innerCollision)
{
    _innerCollision = innerCollision;
}
//-----------------------------------------------------------------------
void PUParticle3DSphereCollider::calculateDirectionAfterCollision(PUParticle3D* particle, Vec3 distance, float distanceLength)
{
    switch (_collisionType)
    {
        case PUParticle3DBaseCollider::CT_BOUNCE:
        {
            /** If the particle is on the surface (or just inside the sphere); bounce it
                Make use of formula R = 2 * (-I dot N) * N + I, where
                R = the new direction vector
                I = the old (unit) direction vector before the collision
                N = the Normal at the collision point
            */
            float directionLength = particle->direction.length();
            particle->direction.normalize();
            distance.normalize();
            particle->direction = 2 * (-particle->direction.dot(distance)) * distance + particle->direction;

            // Adjust to original speed
            particle->direction *= directionLength;

            // Accelerate/slow down, using the bounce value
            particle->direction *= _bouncyness;
        }
        break;
        case PUParticle3DBaseCollider::CT_FLOW:
        {
            /** Reset the position (on the sphere), but keep the direction.
                This doesn't really work good for box-type collisions, because it doesn't take the particle
                dimensions into account.
            */
            float scaledRadius = 0.3333f * (_affectorScale.x + _affectorScale.y + _affectorScale.z) * _radius;
            particle->position = _derivedPosition + distance * (scaledRadius / distanceLength);
        }
        break;
        default:
        break;
    }
}

void PUParticle3DSphereCollider::updatePUAffector( PUParticle3D *particle, float deltaTime )
{
    //for (auto iter : _particleSystem->getParticles())
    {
        //PUParticle3D *particle = iter;
        _predictedPosition = particle->position + _velocityScale * particle->direction;
        bool collision = false;
        Vec3 distance = particle->position - _derivedPosition;
        float distanceLength = distance.length();
        float scaledRadius = 0.3333f * (_affectorScale.x + _affectorScale.y + _affectorScale.z) * _radius; // Scaling changed in V 1.3.1

        switch(_intersectionType)
        {
        case PUParticle3DBaseCollider::IT_POINT:
            {
                // Validate for a point-sphere intersection
                if (_innerCollision == (distanceLength > scaledRadius))
                {
                    // Collision detected (re-position the particle)
                    particle->position -= _velocityScale * particle->direction;
                    collision = true;
                }
                else
                {
                    distance = _predictedPosition - _derivedPosition;
                    distanceLength = distance.length();
                    if (_innerCollision == (distanceLength > scaledRadius))
                    {
                        // Collision detected
                        collision = true;
                    }
                }
            }
            break;

        case PUParticle3DBaseCollider::IT_BOX:
            {
                //// Validate for a box-sphere intersection
                //if (particle->particleType != Particle::PT_VISUAL)
                //	break;
                AABB box;
                populateAlignedBox(box,
                    particle->position, 
                    particle->width, 
                    particle->height,
                    particle->depth);

                //FIXME
                //if (_innerCollision != box.intersects(_sphere))
                //{
                //	// Collision detected (re-position the particle)
                //	particle->position -= _velocityScale * particle->direction;
                //	collision = true;
                //}
                //else
                //{
                //	AABB box;
                //	populateAlignedBox(box,
                //		_predictedPosition, 
                //		particle->width, 
                //		particle->height,
                //		particle->depth);
                //	if (_innerCollision != box.intersects(_sphere))
                //	{
                //		// Collision detected
                //		collision = true;
                //	}
                //}
            }
            break;
        }

        if (collision)
        {
            calculateDirectionAfterCollision(particle, distance, distanceLength);
            calculateRotationSpeedAfterCollision(particle);
            particle->addEventFlags(PUParticle3D::PEF_COLLIDED);
        }
    }
}

void PUParticle3DSphereCollider::preUpdateAffector( float deltaTime )
{
    // Calculate the affectors' center position.
    _sphere.setCenter(getDerivedPosition());
}

PUParticle3DSphereCollider* PUParticle3DSphereCollider::create()
{
    auto psc = new (std::nothrow) PUParticle3DSphereCollider();
    psc->autorelease();
    return psc;
}

NS_CC_END