作业要求：
本次作业基本要求是三选一，选择第三个：
参考http://i-remember.fr/en 这类网站，使用粒子流编程制作一些效果，如“粒子光环”
参考师兄博客
实现效果
实现过程
新建对象
新建空对象ParticleHalo，给particleHalo新建两个空对象,并添加Particle System组件
代码
新建
新建ParticleData类，用来实现粒子效果
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| public class ParticleData
{
public float radius, angle, time;
public ParticleData(float radius_,float angle_,float time_)
{
radius = radius_;
angle = angle_;
time = time_;
}
}
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再定义一个粒子系统的变量，存储对应数据
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| private ParticleSystem particleSys;
private ParticleSystem.Particle[] particleArray;
private ParticleData[] particleData;
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公有成员可以在界面上直接调控
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| public int count = 10000;
public float size = 0.03f;
public float minRadius = 6.0f;
public float maxRadius = 10.0f;
public bool clockwise = true;
public float speed = 2f;
public float pingPong = 0.02f;
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初始化
Start函数进行初始化，主要是对粒子系统进行实例化，相当于在界面里调整各种属性
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| private void Start()
{
particleArray = new ParticleSystem.Particle[count];
particleData = new ParticleData[count];
particleSys = this.GetComponent<ParticleSystem>();
particleSys.startSpeed = 0;
particleSys.startSize = size;
particleSys.loop = false;
particleSys.maxParticles = count;
particleSys.Emit(count);
particleSys.GetParticles(particleArray);
setParticlePosition();
}
void setParticlePosition()
{
float midRadius, minRate, maxRate, radius,angle,theta,time;
for (int i = 0; i < count; i++)
{
midRadius = (maxRadius + minRadius) / 2;
minRate = Random.Range(1.0f, midRadius / minRadius);
maxRate = Random.Range(midRadius / maxRadius, 1.0f);
radius = Random.Range(minRadius * minRate, maxRadius * maxRate);
angle = Random.Range(0.0f, 360.0f);
theta = angle / 180 * Mathf.PI;
time = Random.Range(0.0f, 360.0f);
particleData[i] = new ParticleData(radius,angle,time);
particleArray[i].position = new Vector3(particleData[i].radius * Mathf.Cos(theta), particleData[i].radius * Mathf.Sin(theta),0f);
}
particleSys.SetParticles(particleArray, particleArray.Length);
}
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运动
让每个粒子的角度在每一帧都减少或增加一个值就可以实现旋转，价格速度差分层数让不同层的粒子旋转的速度不一样
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| private int diff = 10;
private void Update()
{
float theta;
for (int i = 0; i < count; i++)
{
if (clockwise)
{
particleData[i].angle -= (i % diff + 1) * (speed / particleData[i].radius / diff);
}
else
{
particleData[i].angle += (i % diff + 1) * (speed / particleData[i].radius / diff);
}
particleData[i].angle = (360.0f + particleData[i].angle) % 360.0f;
theta = particleData[i].angle / 180 * Mathf.PI;
particleArray[i].position = new Vector3(particleData[i].radius * Mathf.Cos(theta), particleData[i].radius * Mathf.Sin(theta), 0f);
}
particleSys.SetParticles(particleArray, particleArray.Length);
}
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设置粒子的跳动效果,让其在这个半径的附近进行“浮游”。主要是运用PingPong算法：
Update函数中在确定particleArr [i]的位置之前，对运动半径进行处理：
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| particleData[i].time += Time.deltaTime;
particleData[i].radius += Mathf.PingPong(particleData[i].time / minRadius / maxRadius, pingPong) - pingPong / 2.0f;
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透明度和颜色
加入新的公有成员：
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| public Gradient colorGradient;
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在inspector窗口里改变colorGradient的值
start函数进行颜色初始化
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| void changeColor()
{
float colorValue;
for (int i = 0; i < count; i++)
{
colorValue = (Time.realtimeSinceStartup - Mathf.Floor(Time.realtimeSinceStartup));
colorValue += particleData[i].angle/360;
while (colorValue > 1)
colorValue--;
particleArray[i].color = colorGradient.Evaluate(colorValue);
}
}
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在Update函数的for循环里加上执行改变函数的语句
项目地址
Github
演示视频
bilibili
