How to set the scale of a particle 2D node with code

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:bust_in_silhouette: Asked By javrocks

My particle 2d node acts as a Shockwave. When i instance the scene i want the shockwave to be smaller (i.e the scale to be smaller)

extends Area2D


export(PackedScene) var Shockwave: PackedScene = preload("res://Scenes/ShockwaveEmitter.tscn")


func _ready():

  pass



func instance(current_node: Node) -> void:
    if not current_node == self:
	    return

    var scene_instance = (Shockwave.instance())
    get_tree().current_scene.add_child(scene_instance)
    scene_instance.global_position = global_position 
    scene_instance.emitting = true
    scene_instance.get_node("LifeSpan").start()
    scene_instance.get_node(".").scale_amount_set_param(2)

I don’t know the function that would change the scale that’s in Process material. .
#scale_amount_set_param(2) dosen’t work