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