public SusceptibleParticleSystem(
ParticleSystemForceReceiver forceReceiver, float influence, ForceMaterial material
)
{
this.ForceReceiver = forceReceiver;
this.Influence = influence;
this.Material = material;
}
/* TODO: make ParticleSystemForceReceiver update itself.
* Query all force fields in FixedUpdate method of ParticleSystemForceReceiver,
* apply forces and call FlushParticles (). This way we will flush particles only once. */
private void ApplyToParticles(float timeFactor)
{
var origin = Origin;
float radiusSq = Radius * Radius;
var susceptibleReceivers = ParticleSystemForceReceiver.GetSusceptibleReceivers(Kind);
foreach (var receiverInfo in susceptibleReceivers)
{
var receiver = receiverInfo.ForceReceiver;
var bounds = receiver.Bounds;
if (bounds.SqrDistance(origin) <= radiusSq)
{
float influence = receiverInfo.Influence;
float velocityChangeAmount = PhysicsHelper.ConvertToVelocityChange(Amount, Mode, receiver.ParticleMass);
velocityChangeAmount *= influence * timeFactor * AnimatedMultiplier;
int count;
var particles = receiver.ReadParticles(out count);
bool changed = false;
for (int i = 0; i < count; i++)
{
var particle = particles [i];
var distanceVector = ( Vector2 )particle.position - origin;
float distance = distanceVector.magnitude;
if (distance < Radius)
{
float distanceFactor = DecreaseWithDistance ? 1 - distance / Radius : 1;
float particleVelocityChangeAmount = velocityChangeAmount * distanceFactor;
var direction = distanceVector.normalized;
var velocityChange = direction * particleVelocityChangeAmount;
particle.velocity += ( Vector3 )velocityChange;
particles [i] = particle;
changed = true;
}
}
if (changed)
{
receiver.FlushParticles();
}
}
}
}
/* TODO: make ParticleSystemForceReceiver update itself.
* Query all force fields in FixedUpdate method of ParticleSystemForceReceiver,
* apply forces and call FlushParticles (). This way we will flush particles only once. */
private void ApplyToParticles()
{
var susceptibleReceivers = ParticleSystemForceReceiver.GetSusceptibleReceivers(Kind);
foreach (var receiverInfo in susceptibleReceivers)
{
var receiver = receiverInfo.ForceReceiver;
float velocityChangeAmount = PhysicsHelper.ConvertToVelocityChange(Amount, Mode, receiver.ParticleMass);
var velocityChange = Direction * velocityChangeAmount * receiverInfo.Influence;
int count;
var particles = receiver.ReadParticles(out count);
for (int i = 0; i < count; i++)
{
particles [i].velocity += ( Vector3 )velocityChange;
}
receiver.FlushParticles();
}
}
