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Question by marchall_box · Oct 19, 2016 at 08:58 PM · c#scripting problemparticlesystem

Changing individual color of particles by C# script NOT Working?

Hi, Below is my code and it is not changing any of the individual particle's color.

particle system component is successfully coming in, and I have found good enough amount of particle to update but no color changes.. any suggestions?

 void Update()
     {
  
         sys = GetComponent<ParticleSystem>();
  
         ParticleSystem.Particle[] ps = new ParticleSystem.Particle[sys.maxParticles];
         int count = sys.GetParticles(ps);
  
         //Debug.Log(count + ":::" + c);
  
         for (int i = 0; i < count; i++)
         {
             ParticleSystem.Particle p = ps[i];
             float LifeProcentage = (p.remainingLifetime / p.startLifetime);
             p.startColor = Color.Lerp(Color.clear, Color.red, LifeProcentage); ;
         }
         sys.SetParticles(ps, count);
     }

Thanks!

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Answer by gjf · Oct 19, 2016 at 08:57 PM

seems like you're changing the color of the copy of each particle in your loop. you're not modifying the contents of ps[i]...

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avatar image marchall_box · Oct 19, 2016 at 09:10 PM 0
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oh I though it was returning reference or pointer.. good to know!

avatar image gjf marchall_box · Oct 19, 2016 at 09:27 PM 0
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i didn't try it, but looking at the code, it's most likely the cause...

avatar image ModLunar · Sep 14, 2019 at 06:57 PM 1
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Just as a note, this happens because ParticleSystem.Particle is a struct. Structs in C# (as opposed to classes) are value types, so when you do ParticleSystem.Particle p = ps[i];, you're actually making a deep copy of the particle data, not a reference to the same one particle data. Hope this helps someone :)

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