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Question by devangkantharia · Sep 11, 2018 at 05:21 PM · animationparticlesystemgradientinteractive

How to change already emitted particles color with gradient in a sequential formation from center to outward direction on key press?

Hi,

I have a query regarding changing gradient color of already emitted particles. Starting color of the particle system is 40F8E9FF. I have used cone shape to achieve this form in which emission is done from Base.

alt text

I have 3 gradient colors which are predefined as shown in the photo below:

 1. 40F8E9 to 8264FF 
 2. FF64EB to D8EC4A 
 3. 64FF78 to FF770F


alt text


Question: 1. How can I choose a color from the gradient mentioned in the presets. 2. How can I write a code, in which if I press a key, it pickups the color from preset, and creates an animate of color change of all particles from center to outward in a sequential progressive manner.

Till now I could use a script which helped me to change the color of all the emitted particles immediately but it is not animating.

I also tried to change m_Particles[ i +1 ].startColor, m_Particles[ i+2 ].startColor to gradiant color but my application crashed.

Please help me to solve this.


 [RequireComponent(typeof(ParticleSystem))]
 public class ChangeAllParticleColor : MonoBehaviour {
 
     ParticleSystem m_System;
     ParticleSystem.Particle[] m_Particles;
     public float m_Drift = 0.01f;
 
     private Color32 color;
 
     private void LateUpdate()
     {
         InitializeIfNeeded();
 
         // GetParticles is allocation free because we reuse the m_Particles buffer between updates
         int numParticlesAlive = m_System.GetParticles(m_Particles);
 
         // Change only the particles that are alive
         for (int i = 0; i < numParticlesAlive; i++)
         {
             //m_Particles[i].velocity += Vector3.up * m_Drift;
             color = new Color(1, 1, 1);
             m_Particles[i].startColor = color;
         }
 
         // Apply the particle changes to the particle system
         m_System.SetParticles(m_Particles, numParticlesAlive);
     }
 
     void InitializeIfNeeded()
     {
         if (m_System == null)
             m_System = GetComponent<ParticleSystem>();
 
         if (m_Particles == null || m_Particles.Length < m_System.main.maxParticles)
             m_Particles = new ParticleSystem.Particle[m_System.main.maxParticles];
     }
 }


I am a designer but trying to write a script for animation.

Regards, DK

1.jpg (46.3 kB)
2.jpg (42.8 kB)
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Answer by richardkettlewell · Sep 12, 2018 at 08:32 PM

Set the gradient on the ColorOverLifetime module.

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