One simple way is setting your colors as HDR in shadergraph

 

and use AgePercent to Lerp between the color

 

 

The only counterpart is if you want 4 different colors over the particule life, you will have to declare 4 colors :

 

 

 

Here the result :

 

 

In few words, each smoothstep provide a [0-1] value to lerp between the different colors.
The smoothstep range is define by [1 / 3 (numberOfSmoothstep)]

 

• for the first one you have [0 => 0.33]
• the seconde one : [0.33 => 0.33 * 2]
• the last one : [0.33 * 2 => 0.33 * 3]

 

I hope it’s what you’re looking for in a way!
And here the shader for example (you can see the setup for shuriken in the gif). Sorry, i don’t know how to add commentary in shadergraph… and it’s look like it’s impossible for the moment!

 

다운로드

https://drive.google.com/file/d/19oafzIyZIg3qzvszjFwKc0z7ZHYOiPUZ/view

 

 

Ok, so here is what I have:

 

Pretty basic, i just want to influence the alpha.

Now I want to join a noise with it, a multiply should be enough:

 

 

Here is the result:

 

 

And here is the setting for the particle system

 

 

It completely ignores any values put on the custom data. But if I remove UV (TXCOORD0.xy)

 

 

 

Well, it works ! Buuuut now it loses its ability to read the texture.

If it isn’t clear enough please tell me ! And thank you for dedicating time for newbies like me <3