@tool
class_name Quaker extends Node3D
## Screws with the scale of children.

## Scale all axes equally. Overrides `correlated`.
@export var uniform := false

## Correlate axis scale.
@export var correlated := false

@export var intensity := 0.0

var _buffer := Vector3.ONE


func rand_exp() -> float:
	return exp(randfn(0, intensity))


func rand_scale() -> Vector3:
	if uniform:
		return Vector3.ONE * rand_exp()
	if correlated:
		var v := Vector3(rand_exp(), _buffer.x, _buffer.y)
		_buffer.x = _buffer.y
		_buffer.y = _buffer.z
		_buffer.z = v.x
		return v
	return Vector3(rand_exp(), rand_exp(), rand_exp())


func _process(_delta: float) -> void:
	scale = rand_scale()