void Start()
{
flag = -1;
particleAttr = new particleClass[particleNum];
particlesArray = new ParticleSystem.Particle[particleNum];
//particleSystem.maxParticles = particleNum;
particleSystem.Emit(particleNum);
particleSystem.GetParticles(particlesArray);
for (int i = 0; i < particleNum; i++)
{
//相应初始化操作，为每个粒子设置半径，角度
float randomAngle;
// 随机产生每个粒子距离中心的半径，同时粒子要集中在平均半径附近
float maxR, minR;
if (i < particleNum * 5 / 12)//这部分粒子属于较宽的那个环
{
maxR = outMaxRadius;
minR = outMinRadius;
randomAngle = Random.Range(0.0f, 360.0f);
}
else//窄环带缺口，设置一半向0度集中、一半向180度集中，以便在90度和-90度形成两个对称缺口
{
maxR = inMaxRadius;
minR = inMinRadius;
float minAngle = Random.Range(-90f, 0.0f);
float maxAngle = Random.Range(0.0f, 90f);
float angle = Random.Range(minAngle, maxAngle);
randomAngle = i % 2 == 0 ? angle : angle - 180;//利用对称性设置另一半粒子
}
float midRadius = (maxR + minR) / 2;
float min = Random.Range(minR, midRadius);
float max = Random.Range(midRadius, maxR);
float randomRadius = Random.Range(min, max);
float collectRadius;
//注意设置平均半径外围的粒子缩小时移动的距离少一些
if (randomRadius > midRadius)
{
collectRadius = randomRadius - (randomRadius - midRadius) / 2;
}
else
{
collectRadius = randomRadius - (randomRadius - midRadius) * 3 / 4;
}
//粒子属性设置
particleAttr[i] = new particleClass(randomRadius, randomAngle, collectRadius);
particlesArray[i].position = new Vector3(randomRadius * Mathf.Cos(randomAngle), randomRadius * Mathf.Sin(randomAngle), 0.0f);
}
//设置粒子
particleSystem.SetParticles(particlesArray, particleNum);
}
void Start()
{
particleAttr = new particleClass[particleNum];
particlesArray = new ParticleSystem.Particle[particleNum];
particleSystem.maxParticles = particleNum;
particleSystem.Emit(particleNum);
particleSystem.GetParticles(particlesArray);
for (int i = 0; i < particleNum; i++)
{ //相应初始化操作，为每个粒子设置半径，角度
//产生一个随机角度
float randomAngle = Random.Range(0.0f, 360.0f);
// 随机产生每个粒子距离中心的半径，同时粒子要集中在平均半径附近
float midRadius = (maxRadius + minRadius) / 2;
float minRate = Random.Range(1.0f, midRadius / minRadius);
float maxRate = Random.Range(midRadius / maxRadius, 1.0f);
float randomRadius = Random.Range(minRadius * minRate, maxRadius * maxRate);
////一种待完善的产生随机粒子的办法 box-muller
//float sita = 2 * Mathf.PI * Random.Range(0, 1);
//float R = Mathf.Sqrt(-2 * Mathf.Log(0.7f));
//float Z = R * Mathf.Cos(sita);
//float randomRadius = (minRadius + maxRadius) / 2 + Z * 2.5f;
//print(randomRadius);
//Debug.Log("r = " + R);
//Debug.Log(randomRadius);
//粒子属性设置
particleAttr[i] = new particleClass(randomRadius, randomAngle);
particlesArray[i].position = new Vector3(randomRadius * Mathf.Cos(randomAngle), randomRadius * Mathf.Sin(randomAngle), 0.0f);
}
//设置粒子
particleSystem.SetParticles(particlesArray, particleNum);
}
