ParticleSystem.EmissionModule.rateOverDistance

描述

发射器根据距离生成新粒子的速率。

发射器只有在移动时才会生成新的粒子。如果系统的 GameObject 包含 Rigidbody 或 Rigidbody2D 组件，并且系统的 发射器速度 属性设置为 刚体，Unity 会根据刚体的速度计算距离。否则，Unity 会根据 GameObject 的 Transform 组件自上次更新以来移动的距离计算距离。其他资源：MinMaxCurve，ParticleSystem.EmissionModule.rateOverTime，ParticleSystem.MainModule.emitterVelocityMode。

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(ParticleSystem))]
public class ExampleClass : MonoBehaviour
{
    private ParticleSystem ps;
    public float hSliderValue = 5.0f;

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

        var main = ps.main;
        main.simulationSpace = ParticleSystemSimulationSpace.World;

        var shape = ps.shape;
        shape.enabled = false;

        var emission = ps.emission;
        emission.rateOverTime = 0.0f;

        // add a sphere so we can see our transform position as it moves
        var sphere = GameObject.CreatePrimitive(PrimitiveType.Sphere);
        sphere.transform.parent = ps.transform;
    }

    void Update()
    {
        var emission = ps.emission;
        emission.rateOverDistance = hSliderValue;

        ps.transform.position = new Vector3(Mathf.Sin(Time.time) * 2.0f, 0.0f, 0.0f);
    }

    void OnGUI()
    {
        hSliderValue = GUI.HorizontalSlider(new Rect(25, 45, 100, 30), hSliderValue, 1.0f, 20.0f);
    }
}