修改用于旋转粒子的轴心点。
单位表示为粒子大小的倍数（相对于其直径）。例如，值 0.5 会按粒子半径调整轴心，从而使粒子可以围绕其边缘旋转。
using UnityEngine;
using UnityEditor;
using System.Collections;
public class ExampleClass : MonoBehaviour {
private ParticleSystem ps;
private ParticleSystemRenderer psr;
public Vector3 pivot;
void Start() {
ps = GetComponent<ParticleSystem>();
psr = GetComponent<ParticleSystemRenderer>();
psr.material = AssetDatabase.GetBuiltinExtraResource<Material>("Default-Diffuse.mat"); // square material so we can see the pivot more easily
var rotation = ps.rotationOverLifetime;
rotation.enabled = true;
rotation.zMultiplier = 180.0f; // spin so we can see the pivot more easily
}
void Update() {
psr.pivot = pivot;
}
void OnGUI() {
GUI.Label(new Rect(25, 40, 100, 30), "X");
GUI.Label(new Rect(25, 80, 100, 30), "Y");
GUI.Label(new Rect(25, 120, 100, 30), "Z");
pivot.x = GUI.HorizontalSlider(new Rect(65, 25, 100, 30), pivot.x, -2.0f, 2.0f);
pivot.y = GUI.HorizontalSlider(new Rect(65, 65, 100, 30), pivot.y, -2.0f, 2.0f);
pivot.z = GUI.HorizontalSlider(new Rect(65, 105, 100, 30), pivot.z, -2.0f, 2.0f);
}
}