[Tip] How to control the shape of the lightning jolt.

[This is not a question but just want to share this with future learners]

Rewrite the following code:

var _rotation := rand_range(-spread_angle / 2, spread_angle / 2)

to

var _angle := spread_angle * spread_angle_limit

var _rotation := rand_range(-_angle, _angle)

where spread_angle_limit is defined as

export (float, 0.0, 0.5) var spread_angle_limit := 0.5

Using 0.0 will render a straight line (laser beam effect).