v2.7.2 Fix the performance issue of the color anim

May require more investigation since the evaluate method may work with  more setup/test

ModelMultiShurikenPersistFX.cs

@@ -627,27 +627,14 @@ public override void OnInitialize()
                     ParticleSystem.ColorOverLifetimeModule col = particleSystem.colorOverLifetime;
 
                     // This one is annoying. The old particle system animate the color over the whole % life of the particle (0 - 1)
-                    // The new one animate it over time. So converted system may not reac the full value
-                    // The animation is set up here but disabled and the color is manually set in the update of PersistentKSPShurikenEmitter with this gradient
+                    // The new one animate it over time. So converted system may not reach the full value
+                    // The color is manually set in the update of PersistentKSPShurikenEmitter
                     col.enabled = false;
 
-                    GradientColorKey[] colorKeys = new GradientColorKey[5];
-                    GradientAlphaKey[] alphaKeys = new GradientAlphaKey[5];
-
                     Color[] colors = childKSPParticleEmitter.colorAnimation;
-
-                    float step = 1f / (colors.Length - 1);
-
-                    for (int t = 0; t < colors.Length; t++)
-                    {
-                        colorKeys[t] = new GradientColorKey(colors[t], 1 - t * step);
-                        alphaKeys[t] = new GradientAlphaKey(colors[t].a, 1 - t * step);
-                    }
-
-                    Gradient gradient = new Gradient();
-                    gradient.SetKeys(colorKeys, alphaKeys);
-
-                    col.color = new ParticleSystem.MinMaxGradient(gradient);
+
+                    pkpe.colors = new Color[colors.Length];
+                    Array.Copy(colors, pkpe.colors, colors.Length);
                 }
 
                 //try

PersistentKSPShurikenEmitter.cs

@@ -75,6 +75,7 @@ public class PersistentKSPShurikenEmitter
     public Vector3 rndForce;
     public Color color;
     public bool doesAnimateColor;
+    public Color[] colors;
 
     //private float emitterVelocityScale;
     private Vector3 rndVelocity;
@@ -547,8 +548,38 @@ public void EmitterOnUpdate(Vector3 emitterWorldVelocity)
 
                 if (doesAnimateColor)
                 {
-                    float lifePercentage = (particle.lifetime / particle.startLifetime);
-                    particle.startColor = pe.colorOverLifetime.color.Evaluate(lifePercentage);
+                    float lifePercentage = 1 - (particle.lifetime / particle.startLifetime);
+
+                    float lerp;
+                    Color a;
+                    Color b;
+                    if (lifePercentage < 0.25f)
+                    {
+                        a = colors[0];
+                        b = colors[1];
+                        lerp = lifePercentage * 4f;
+                    }
+                    else if (lifePercentage < 0.50f)
+                    {
+                        a = colors[1];
+                        b = colors[2];
+                        lerp = (lifePercentage - 0.25f) * 4f;
+                    }
+                    else if (lifePercentage < 0.75f)
+                    {
+                        a = colors[2];
+                        b = colors[3];
+                        lerp = (lifePercentage - 0.50f) * 4f;
+                    }
+                    else 
+                    {
+                        a = colors[3];
+                        b = colors[4];
+                        lerp = (lifePercentage - 0.75f) * 4f;
+                    }
+
+                    Color c = Color.Lerp(a, b, lerp);
+                    particle.startColor = c;
                 }
             }
             particles[j] = particle;

Properties/AssemblyInfo.cs

@@ -34,5 +34,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("2.7.1.0")]
-[assembly: AssemblyFileVersion("2.7.1.0")]
+[assembly: AssemblyVersion("2.7.2.0")]
+[assembly: AssemblyFileVersion("2.7.2.0")]