godot/demos/2d/dynamic_collision_shapes/dynamic_colobjs.gd

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extends Node2D
# member variables here, example:
# var a=2
# var b="textvar"
const EMIT_INTERVAL=0.1
var timeout=EMIT_INTERVAL
func _process(delta):
timeout-=delta
if (timeout<0):
timeout=EMIT_INTERVAL
var ball = preload("res://ball.scn").instance()
ball.set_pos( Vector2(randf() * get_viewport_rect().size.x, 0) )
add_child(ball)
func _ready():
set_process(true)
# Initialization here
pass