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Assets/Plugins/BezierSolution/Utilities/ParticlesFollowBezier.cs

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+using System.Collections.Generic;
+using UnityEngine;
+
+namespace BezierSolution
+{
+	[AddComponentMenu( "Bezier Solution/Particles Follow Bezier" )]
+	[HelpURL( "https://github.com/yasirkula/UnityBezierSolution" )]
+	[RequireComponent( typeof( ParticleSystem ) )]
+	[ExecuteInEditMode]
+	public class ParticlesFollowBezier : MonoBehaviour
+	{
+		private const int MAX_PARTICLE_COUNT = 25000;
+
+		public enum FollowMode { Relaxed, Strict };
+
+		public BezierSpline spline;
+		public FollowMode followMode = FollowMode.Relaxed;
+
+		private Transform cachedTransform;
+		private ParticleSystem cachedPS;
+		private ParticleSystem.MainModule cachedMainModule;
+
+		private ParticleSystem.Particle[] particles;
+		private List<Vector4> particleData;
+
+		private void Awake()
+		{
+			cachedTransform = transform;
+			cachedPS = GetComponent<ParticleSystem>();
+
+			cachedMainModule = cachedPS.main;
+			particles = new ParticleSystem.Particle[cachedMainModule.maxParticles];
+
+			if( followMode == FollowMode.Relaxed )
+				particleData = new List<Vector4>( particles.Length );
+		}
+
+#if UNITY_EDITOR
+		private void OnEnable()
+		{
+			Awake();
+		}
+#endif
+
+#if UNITY_EDITOR
+		private void LateUpdate()
+		{
+			if( !UnityEditor.EditorApplication.isPlaying )
+				FixedUpdate();
+		}
+#endif
+
+		private void FixedUpdate()
+		{
+			if( spline == null || cachedPS == null )
+				return;
+
+			if( particles.Length < cachedMainModule.maxParticles && particles.Length < MAX_PARTICLE_COUNT )
+				System.Array.Resize( ref particles, Mathf.Min( cachedMainModule.maxParticles, MAX_PARTICLE_COUNT ) );
+
+			bool isLocalSpace = cachedMainModule.simulationSpace != ParticleSystemSimulationSpace.World;
+			int aliveParticles = cachedPS.GetParticles( particles );
+
+			Vector3 initialPoint = spline.GetPoint( 0f );
+			if( followMode == FollowMode.Relaxed )
+			{
+				if( particleData == null )
+					particleData = new List<Vector4>( particles.Length );
+
+				cachedPS.GetCustomParticleData( particleData, ParticleSystemCustomData.Custom1 );
+
+				// Credit: https://forum.unity3d.com/threads/access-to-the-particle-system-lifecycle-events.328918/#post-2295977
+				for( int i = 0; i < aliveParticles; i++ )
+				{
+					Vector4 particleDat = particleData[i];
+					Vector3 point = spline.GetPoint( 1f - ( particles[i].remainingLifetime / particles[i].startLifetime ) );
+					if( !isLocalSpace )
+						point = cachedTransform.TransformPoint( point - initialPoint );
+
+					// Move particles alongside the spline
+					if( particleDat.w != 0f )
+						particles[i].position += point - (Vector3) particleDat;
+
+					particleDat = point;
+					particleDat.w = 1f;
+					particleData[i] = particleDat;
+				}
+
+				cachedPS.SetCustomParticleData( particleData, ParticleSystemCustomData.Custom1 );
+			}
+			else
+			{
+				for( int i = 0; i < aliveParticles; i++ )
+				{
+					Vector3 point = spline.GetPoint( 1f - ( particles[i].remainingLifetime / particles[i].startLifetime ) ) - initialPoint;
+					if( !isLocalSpace )
+						point = cachedTransform.TransformPoint( point );
+
+					particles[i].position = point;
+				}
+			}
+
+			cachedPS.SetParticles( particles, aliveParticles );
+		}
+	}
+}