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;
}
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;
}
