[Lao Wang’s game development tutorial] Mingchang faces the second bullet Street Fighter 3D: On the birth of a shock wave

The book is followed by "Godot Engine: Using a particle system to achieve a wave of wave fist, yes, it is the hadou gnaw"

Effect picture

HadokenBall

Add a script for HadokenBall

HadokenBall script

HadokenBall has two states:

• The state of the ball of luck in the hand: will follow the movement of the hand
• The state of being separated from the palm: uniform linear motion

The following code is position_refused to obtain the position of the hand. When it is later empty, it means that the HadokenBall has left the hand

#HadokenBall.gd
extends Particles
class_name HadokenBall

var position_ref :Spatial = null

func _ready():
	add_to_group("HadokenBall")

func _process(delta):
	if position_ref != null :
		global_transform.origin = position_ref.global_transform.origin
	else:
		translation += Vector3.RIGHT * 2 * delta

func init_ball(ref):
	position_ref = ref
	transform.origin = position_ref.global_transform.origin
	ref.get_tree().root.add_child(self)

func release_ball():
	position_ref = null

Use the BoneAttachment node to get the position of the hand bone

BoneAttachmentFor the usage of the node, please refer to another blog post by Pharaoh, "Godot Engine: Using BoneAttachment Nodes as Bone Attachments"

Rename "BoneAttachment"

to "HadokenBallPos" and position "HadokenBallPos" to the right hand

Long's code

• Preload "HadokenBall.tscn" first
• Define two callback functions for animation callbacks, one for generating HadokenBall.tscn and one for notifying it to leave the hand

#Ryu
extends Spatial

var h_ball_prefab : PackedScene = preload("res://VFX/HadokenBall.tscn")

onready var playback : AnimationNodeStateMachinePlayback = $AnimationTree.get("parameters/playback")


func _ready():
	add_to_group("Ryu")

func do_combo(move_name):
	playback.travel(move_name + "@Ryu")
			
#AnimationPlayer调用		
func make_ball():
	var h_ball : HadokenBall = h_ball_prefab.instance() as HadokenBall
	h_ball.init_ball($rig/Skeleton/HadokenBallPos)

#AnimationPlayer调用		
func release_ball():
	get_tree().call_group("HadokenBall","release_ball")
	

Use AnimationPlayer to set animation callbacks

For details on how to use animation callbacks, please refer to "Godot Engine: Using Call Method Track to Implement Animation Callbacks"