void UpdateParticles()
{
if (!ParticleSys)
{
return;
}
ParticleSystem.Particle[] ParticleList = new ParticleSystem.Particle[ParticleSys.particleCount];
int NumParticleAlive = ParticleSys.GetParticles(ParticleList);
for (int i = 0; i < NumParticleAlive; ++i)
{
ParticleSystem.Particle Particle = ParticleList[i];
VelocityFieldNode velocityField = new VelocityFieldNode();
bool IsImported = false;
if (Curve)
{
IsImported = GetTargetNode(Particle, ref Curve.VelocityField, ref velocityField);
}
if (!IsImported)
{
continue;
}
Vector3 targetVelocity = velocityField.TargetVelocity * SpeedOnCurve * velocityField.Mag;
// get vector from particle position to curve's iteration pos
Vector3 toCurveVelocity = (velocityField.TargetPosition - Particle.position).normalized;
targetVelocity += toCurveVelocity * ForceToNearestCurve;
// apply hierarchy scale for velocity as well
targetVelocity.x *= transform.lossyScale.x;
targetVelocity.y *= transform.lossyScale.y;
targetVelocity.z *= transform.lossyScale.z;
ParticleList[i].position = Particle.position + (targetVelocity * Time.deltaTime);
ParticleList[i].velocity = Particle.velocity;
}
ParticleSys.SetParticles(ParticleList, ParticleSys.particleCount);
}
public void CalculateVelocityField()
{
VelocityField.Clear();
Vector3 prevPos = P0.transform.position;
for (int c = 1; c <= Resolution; c++)
{
float t = (float)c / Resolution;
Vector3 currPos = CurveMath.CalculateBezierPoint(t, P0.transform.position, P0_Tangent.transform.position, P1_Tangent.transform.position, P1.transform.position);
Vector3 currTan = (currPos - prevPos).normalized;
float mag = VelocityMagCurve.Evaluate(t);
VelocityFieldNode ti = new VelocityFieldNode();
ti.TargetPosition = prevPos;
ti.TargetVelocity = currTan;
ti.Mag = mag;
VelocityField.Add(ti);
prevPos = currPos;
}
}
private bool GetTargetNode(ParticleSystem.Particle Particle, ref List <VelocityFieldNode> velocityField, ref VelocityFieldNode targetInfo)
{
float minDist = float.MaxValue;
VelocityFieldNode node = new VelocityFieldNode();
for (int i = 0; i < velocityField.Count; i++)
{
float dist = Vector3.Distance(velocityField[i].TargetPosition, Particle.position);
if (dist > SearchRadius)
{
continue;
}
if (dist < minDist)
{
minDist = dist;
node = velocityField[i];
}
}
targetInfo = node;
return(true);
}