bool AttributeAttractRepelParticleAffector::affect(ParticleSystemRefPtr System, Int32 ParticleIndex, const Time& elps)
{
    if(System != NULL)
    {
        Vec3f Displacement(System->getSecPosition(ParticleIndex) - System->getPosition(ParticleIndex) );

        Real32 Distance(Displacement.squareLength());

        if((Distance > getMinDistance()*getMinDistance()) &&
           (Distance < getMaxDistance()*getMaxDistance()))
        {
            Distance = osgSqrt(Distance);
            Displacement.normalize();

            Real32 t((getQuadratic() * (Distance*Distance) + getLinear() * Distance + getConstant())*elps);
            if(t > Distance)
            {
                t=Distance;
            }

            System->setPosition(System->getPosition(ParticleIndex) + (Displacement * t),ParticleIndex) ;
        }
    }
    return false;
}
コード例 #2
0
bool RandomMovementParticleAffector::affect(ParticleSystemRefPtr System, Int32 ParticleIndex, const Time& elps)
{
    //System->setUpdateSecAttribs(false);
    Real32 x,
           y,
           z,
           age(System->getAge(ParticleIndex));

    if(getAttributeAffected() == VELOCITY_ATTRIBUTE)
    {
        Vec3f vel = System->getSecVelocity(ParticleIndex);
        // grab each value independently , and adjust the phase for each
        // axis, since we have a 3D phase and the 1D distribution only takes
        // one value
        Real32 velSum = vel.x() + vel.y() + vel.z();

        getPerlinDistribution()->setPhase(getPhase().x() + velSum);
        x = getPerlinDistribution()->generate(vel.x() + age);
        getPerlinDistribution()->setPhase(getPhase().y() + velSum);
        y = getPerlinDistribution()->generate(vel.y() + age);
        getPerlinDistribution()->setPhase(getPhase().z() + velSum);
        z = getPerlinDistribution()->generate(vel.z() + age);


        System->setVelocity(Vec3f(x,y,z) + vel,ParticleIndex);

    }else // affecting position	
    {
        Pnt3f pos = System->getSecPosition(ParticleIndex);
        Real32 posSum = pos.x() + pos.y() + pos.z();

        getPerlinDistribution()->setPhase(getPhase().x() + posSum);
        x = getPerlinDistribution()->generate(pos.x() + age);
        getPerlinDistribution()->setPhase(getPhase().y() + posSum);
        y = getPerlinDistribution()->generate(pos.y() + age);
        getPerlinDistribution()->setPhase(getPhase().z() + posSum);
        z = getPerlinDistribution()->generate(pos.z() + age);


        System->setPosition(Pnt3f(x,y,z) + pos.subZero(),ParticleIndex);
    }

    return false;
}