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49 lines
1.4 KiB
49 lines
1.4 KiB
using UnityEngine;
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using System.Collections;
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public class SparkParticles : MonoBehaviour
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{
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public Transform BillboardTarget;
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ParticleSystem _particleSystem;
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// There is a fixed buffer size for particles hacked into this script.
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// This means the script will cap the max number of particles to whatever the length of this array is.
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// It's ugly I know. Sorry!
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ParticleSystem.Particle[] _particles = new ParticleSystem.Particle[25];
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void Awake()
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{
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_particleSystem = GetComponent<ParticleSystem>();
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if (BillboardTarget == null)
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BillboardTarget = Camera.main.transform;
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}
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void FixParticleRotations()
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{
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int count = _particleSystem.GetParticles(_particles);
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for (int i = 0; i < count; i++)
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{
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Vector3 dir = _particles[i].velocity.normalized;
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float rot = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
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_particles[i].rotation = rot;
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}
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_particleSystem.SetParticles(_particles, _particleSystem.particleCount);
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}
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public void Play()
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{
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transform.LookAt(BillboardTarget);
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_particleSystem.Play();
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StartCoroutine(LateFix());
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}
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// It seems setting the rotations on the frame you tell the system to Play is insufficient.
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// So this handy coroutine delays that by a single frame.
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IEnumerator LateFix()
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{
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yield return null;
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FixParticleRotations();
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}
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}
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