96 lines
4.1 KiB
C#
96 lines
4.1 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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[ExecuteInEditMode] // 让脚本在编辑器模式下也能执行
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public class ParticleAttractionPoint : MonoBehaviour
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{
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[Header("吸附参数")]
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[Tooltip("粒子吸附目标点")]
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public Transform attractionPoint; // 吸附目标点
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[Tooltip("粒子生成多久后开始进行吸附")]
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[Range(0.0f, 100.0f)]
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public float delayTime = 0.0f; // 延迟时间
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[Tooltip("粒子开始进行吸附计算后的大小变化曲线")]
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public AnimationCurve SizeCurve = new AnimationCurve(); // 控制移动的曲线
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[Tooltip("是否使用距离比例计算")]
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public bool UseDistance = false;
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[Header("逐帧计算")]
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public float attractionSpeed=50.0f;
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[Header("距离比例计算")]
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[Range(0.001f, 2.0f)] // 限制时间缩放的最大值和最小值
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public float timeScale = 1.0f; // 时间缩放
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private ParticleSystem particleSystemComponent;
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private ParticleSystem.Particle[] particles;
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void OnEnable() // 改用OnEnable替代Start,这样在编辑器中也能初始化
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{
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particleSystemComponent = GetComponent<ParticleSystem>();
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particles = new ParticleSystem.Particle[particleSystemComponent.main.maxParticles];
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}
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void LateUpdate()
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{
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if(!particleSystemComponent) return; // 添加空检查
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int particleCount = particleSystemComponent.GetParticles(particles);
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if(attractionPoint == null) return; // 添加目标点空检查
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for (int i = 0; i < particleCount; i++)
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{
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float lifePercent = 1.0f - (particles[i].remainingLifetime / particles[i].startLifetime);
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// 只有当粒子存在时间超过延迟时间才开始移动
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if(particles[i].startLifetime - particles[i].remainingLifetime >= delayTime)
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{
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//暂存粒子位置
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Vector3 startPos=particles[i].position;
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if (UseDistance)
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{
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// 位置计算方法1 重新计算剩余的距离比例
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float adjustedLifePercent = (particles[i].startLifetime - particles[i].remainingLifetime - delayTime) /
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(particles[i].startLifetime - delayTime);
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// 根据距离比例计算位置
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particles[i].position = Vector3.Lerp(particles[i].position, attractionPoint.position, adjustedLifePercent*timeScale);
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} else
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{
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// 位置计算方法2 朝向吸附点移动
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Vector3 direction = (attractionPoint.position - particles[i].position).normalized;
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particles[i].position += direction * attractionSpeed * Time.deltaTime;
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}
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// 修正粒子size
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float distancePercent=Vector3.Distance(startPos, particles[i].position) / Vector3.Distance(startPos, attractionPoint.position);
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particles[i].startSize = particles[i].startSize * SizeCurve.Evaluate(distancePercent);
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// 当粒子到达目标点时立即消失,可能会有大量粒子，引起优化问题
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// if(Vector3.Distance(particles[i].position, attractionPoint.position) <= 0.9f)
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// {
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// particles[i].remainingLifetime = 0.0f;
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// }
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// // 优化方法1 通过使用SqrMagnitude，可以避免开方运算
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// if (Vector3.SqrMagnitude(particles[i].position - attractionPoint.position) <= 0.9f * 0.9f)
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// {
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// particles[i].remainingLifetime = 0.0f;
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// }
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// 优化方法2 使用Mathf.Approximately进行比较
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if (Mathf.Approximately(Vector3.Distance(particles[i].position, attractionPoint.position), 0.0f) ||
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Vector3.Distance(particles[i].position, attractionPoint.position) <= 0.9f)
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{
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particles[i].remainingLifetime = 0.0f;
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}
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}
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}
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particleSystemComponent.SetParticles(particles, particleCount);
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}
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} |