Unity, Visual Effects Graph - how can I programatically play + stop an effect?

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I want to use the Visual Effect Graph to make a particle explosion. I am trying to activate and stop this explosion programmatically.

I first create a Particles prefab object, and attach a Visual Effect Graph object to it:

img1

Then I make the spawn rate an exposed parameter. So when the explosion activates it will set this parameter to 100. To stop the explosion, the spawn rate will be set to 0:

img2

Now this parameter is visible in the particle prefab:

img3

Then I instantiate the Particles prefab:

var effect = Instantiate(particlesPrefab, position), Quaternion.identity);

The particle effect shows up on the screen, but the problem is I can't find the spawn rate attribute.

How can I programmatically change this attribute's value?

unity3d c#
1 Answers

  1. Get the VisualEffect from the Particles GameObject:

    // In a MonoBehaviour attached to the Particles GameObject

using UnityEngine.Experimental.VFX;

...

// As a field in the MonoBehaviour
public VisualEffect myEffect;

... 

myEffect = GetComponent<VisualEffect>();

  2. Use SetInt to set the exposed integer called "spawn rate":

    // As class field

public static readonly string SPAWN_RATE_NAME = "spawn rate";

// Wherever you want to stop explosion

myEffect.SetInt(SPAWN_RATE_NAME, 0);

// Wherever you want to start explosion

myEffect.SetInt(SPAWN_RATE_NAME, 100);
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