Unity 抛物线，直线，Sine曲线等

1.用粒子制作抛物线。

1.创建一个枚举

public enum FunctionOption {
Linear,
Exponential,
Parabola,
Sine
}

2.创建静态方法

//直线
private static float Linear (float x) {
return x;
}
//曲线
private static float Exponential (float x) {
return x * x;
}
//抛物线
private static float Parabola (float x){
x = 2f * x - 1f;
return x * x;
}
//Sine 曲线 可以通过相位来控制Shader水的流动，有兴趣的可以去实现
private static float Sine (float x){
return 0.5f + 0.5f * Mathf.Sin(2 * Mathf.PI * x + Time.timeSinceLevelLoad);
}

3.创建委托函数

private delegate float FunctionDelegate (float x);
private static FunctionDelegate[] functionDelegates = {
Linear,
Exponential,
Parabola,
Sine
};
public FunctionOption function;

4.创建点

private void CreatePoints () {
currentResolution = resolution;
points = new ParticleSystem.Particle[resolution];
float increment = 1f / (resolution - 1);
for (int i = 0; i < resolution; i++) {
float x = i * increment;
points[i].position = new Vector3(x, 0f, 0f);
points[i].color = new Color(x, 0f, 0f);
points[i].size = 0.1f;
}
}
void Update () {
if (currentResolution != resolution || points == null) {
CreatePoints();
}
FunctionDelegate f = functionDelegates[(int)function];
for (int i = 0; i < resolution; i++) {
Vector3 p = points[i].position;
p.y = f(p.x);
points[i].position = p;
Color c = points[i].startColor;
c.g = p.y;
points[i].startColor = c;
}
GetComponent<ParticleSystem>().SetParticles(points, points.Length);
}

5.全部代码如下 ，并把他放在粒子物体上，不过这个一直是在Update里面执行，所以性能会比较耗性能，这
主要测试功能用的。

using UnityEngine;
public class Test : MonoBehaviour {
public enum FunctionOption {
Linear,
Exponential,
Parabola,
Sine
}
private delegate float FunctionDelegate (float x);
private static FunctionDelegate[] functionDelegates = {
Linear,
Exponential,
Parabola,
Sine
};
public FunctionOption function;
[Range(10, 100)]
public int resolution = 10;
private int currentResolution;
private ParticleSystem.Particle[] points;
private void CreatePoints () {
currentResolution = resolution;
points = new ParticleSystem.Particle[resolution];
float increment = 1f / (resolution - 1);
for (int i = 0; i < resolution; i++) {
float x = i * increment;
points[i].position = new Vector3(x, 0f, 0f);
points[i].color = new Color(x, 0f, 0f);
points[i].size = 0.1f;
}
}
void Update () {
if (currentResolution != resolution || points == null) {
CreatePoints();
}
FunctionDelegate f = functionDelegates[(int)function];
for (int i = 0; i < resolution; i++) {
Vector3 p = points[i].position;
p.y = f(p.x);
points[i].position = p;
Color c = points[i].startColor;
c.g = p.y;
points[i].startColor = c;
}
GetComponent<ParticleSystem>().SetParticles(points, points.Length);
}
private static float Linear (float x) {
return x;
}
private static float Exponential (float x) {
return x * x;
}
private static float Parabola (float x){
x = 2f * x - 1f;
return x * x;
}
private static float Sine (float x){
return 0.5f + 0.5f * Mathf.Sin(2 * Mathf.PI * x + Time.timeSinceLevelLoad);
}
}

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