godot-demo-projects/viewport/3d_in_2d/3D_in_2D.gd

extends Node2D

# Member variables
var viewport = null
var sprite = null
var viewport_sprite = null

# variables for the sprite animation
const MAX_FRAME_FOR_SPRITE = 4
const FRAME_SWITCH_TIME = 0.2
var frame_switch_timer = 0

func _ready():
	viewport = get_node("Viewport")
	sprite = get_node("Sprite")
	viewport_sprite = get_node("Viewport_Sprite")

	# Assign the sprite's texture to the viewport texture
	viewport.set_clear_mode(Viewport.CLEAR_MODE_ONLY_NEXT_FRAME)
	
	# Let two frames pass to make sure the screen was captured
	yield(get_tree(), "idle_frame")
	yield(get_tree(), "idle_frame")
	viewport_sprite.texture = viewport.get_texture()
  
	set_process(true)


# Simple frame based animation
func _process(delta):
	frame_switch_timer += delta
	if frame_switch_timer >= FRAME_SWITCH_TIME:
		frame_switch_timer -= FRAME_SWITCH_TIME
		sprite.frame += 1
	if sprite.frame > MAX_FRAME_FOR_SPRITE:
		sprite.frame = 0