ParticleSystem.TextureSheetAnimationModule.flipU

Description

翻转粒子上的 U 坐标，从而使它们以水平镜像方式显示。

设置为介于 0 与 1 之间的值，较高值会使较高比例的粒子呈现镜像，1 会使所有粒子呈现镜像。

using UnityEngine;

public class ExampleClass : MonoBehaviour
{
    private ParticleSystem ps;
    public float flipU = 0.0f;
    public float flipV = 0.0f;

    void Start()
    {
        ps = GetComponent<ParticleSystem>();

        var main = ps.main;
        main.startLifetimeMultiplier = 2.0f;

        var tex = ps.textureSheetAnimation;
        tex.enabled = true;
        tex.numTilesX = 4;
        tex.numTilesY = 2;
    }

    void Update()
    {
        var tex = ps.textureSheetAnimation;
        tex.flipU = flipU;
        tex.flipV = flipV;
    }

    void OnGUI()
    {
        GUI.Label(new Rect(25, 20, 100, 30), "Flip U Amount");
        GUI.Label(new Rect(25, 60, 100, 30), "Flip V Amount");

        flipU = GUI.HorizontalSlider(new Rect(125, 25, 100, 30), flipU, 0.0f, 1.0f);
        flipV = GUI.HorizontalSlider(new Rect(125, 65, 100, 30), flipV, 0.0f, 1.0f);
    }
}