Demo: Improved AI for melee and ranged

demo/demo/ai/tasks/face_target.gd

@@ -21,7 +21,7 @@ func _generate_name() -> String:
 
 # Called each time this task is ticked (aka executed).
 func _tick(_delta: float) -> Status:
-	var target := blackboard.get_var(target_var) as CharacterBody2D
+	var target: Node2D = blackboard.get_var(target_var)
 	if not is_instance_valid(target):
 		return FAILURE
 	var dir: float = target.global_position.x - agent.global_position.x

demo/demo/ai/tasks/pursue.gd

@@ -10,11 +10,11 @@
 #*
 @tool
 extends BTAction
-## Pursue target.
+## Pursue: Move towards target until agent is flanking it.
 ##
-## Returns RUNNING, while moving towards target but not yet at the desired distance.
+## Returns RUNNING, while moving towards target but not yet at the desired position.
-## Returns SUCCESS, when at the desired distance from target.
+## Returns SUCCESS, when at the desired position from target (flanking it).
-## Returns FAILURE, if target is not a valid instance.
+## Returns FAILURE, if target is not a valid Node2D instance.
 
 
 const TOLERANCE := 30.0
@@ -23,33 +23,48 @@ const TOLERANCE := 30.0
 @export var speed_var: String = "speed"
 @export var approach_distance: float = 100.0
 
-var _side: float
+#var _side: float
+var _waypoint: Vector2
 
 # Display a customized name (requires @tool).
 func _generate_name() -> String:
 	return "Pursue %s" % [LimboUtility.decorate_var(target_var)]
 
-# Called each time this task is entered.
+
 func _enter() -> void:
-	_side = 0.0
+	var target: Node2D = blackboard.get_var(target_var, null)
+	if is_instance_valid(target):
+		_select_new_waypoint(_get_desired_position(target))
+
 
 # Called each time this task is ticked (aka executed).
 func _tick(_delta: float) -> Status:
-	var target := blackboard.get_var(target_var, null) as CharacterBody2D
+	var target: Node2D = blackboard.get_var(target_var, null)
 	if not is_instance_valid(target):
 		return FAILURE
 
-	if _side == 0:
+	var desired_pos: Vector2 = _get_desired_position(target)
-		var dir: Vector2 = agent.global_position - target.global_position
+	if agent.global_position.distance_to(desired_pos) < TOLERANCE:
-		_side = signf(dir.x)
-	var target_pos := Vector2(
-		target.global_position.x + approach_distance * _side,
-		target.global_position.y)
-
-	if agent.global_position.distance_to(target_pos) < TOLERANCE:
 		return SUCCESS
 
 	var speed: float = blackboard.get_var(speed_var, 200.0)
-	agent.velocity = agent.global_position.direction_to(target_pos) * speed
+	if agent.global_position.distance_to(_waypoint) < TOLERANCE:
+		_select_new_waypoint(desired_pos)
+	agent.velocity = agent.global_position.direction_to(_waypoint) * speed
 	agent.move_and_slide()
 	return RUNNING
+
+
+## Get closest flanking position to target.
+func _get_desired_position(target: Node2D) -> Vector2:
+	var side: float = signf(agent.global_position.x - target.global_position.x)
+	var desired_pos: Vector2 = target.global_position
+	desired_pos.x += approach_distance * side
+	return desired_pos
+
+
+## Select an intermidiate waypoint towards the desired position.
+func _select_new_waypoint(desired_position: Vector2) -> void:
+	var distance_vector: Vector2 = desired_position - agent.global_position
+	var angle_variation: float = randf_range(-0.2, 0.2)
+	_waypoint = agent.global_position + distance_vector.limit_length(150.0).rotated(angle_variation)

demo/demo/ai/tasks/select_flanking_pos.gd

@@ -30,7 +30,7 @@ extends BTAction
 
 # Display a customized name (requires @tool).
 func _generate_name() -> String:
-	return "SelectFlankingPos  target: %s  range: [%s, %s]  closest: %s  ➜ %s" % [
+	return "SelectFlankingPos  target: %s  range: [%s, %s]  closest: %s  ➜%s" % [
 		LimboUtility.decorate_var(target_var),
 		range_min,
 		range_max,

demo/demo/ai/tasks/select_random_nearby_pos.gd

@@ -0,0 +1,23 @@
+@tool
+extends BTAction
+## SelectRandomNearbyPos: Select a position nearby within specified range.
+## Returns SUCCESS.
+
+## Maximum distance to the desired position.
+@export var range_min: float = 300.0
+@export var range_max: float = 500.0
+@export var position_var: String = "_pos"
+
+# Display a customized name (requires @tool).
+func _generate_name() -> String:
+	return "SelectRandomNearbyPos  range: [%s, %s]  ➜%s" % [
+		range_min, range_max,
+		LimboUtility.decorate_var(position_var)]
+
+# Called each time this task is ticked (aka executed).
+func _tick(_delta: float) -> Status:
+	var angle: float = randf() * TAU
+	var rand_distance: float = randf_range(range_min, range_max)
+	var pos: Vector2 = agent.global_position + Vector2(sin(angle), cos(angle)) * rand_distance
+	blackboard.set_var(position_var, pos)
+	return SUCCESS

demo/demo/ai/trees/enemy_melee_nuanced.tres

@@ -1,4 +1,4 @@
-[gd_resource type="BehaviorTree" load_steps=40 format=3 uid="uid://c2u6sljqkim0n"]
+[gd_resource type="BehaviorTree" load_steps=41 format=3 uid="uid://c2u6sljqkim0n"]
 
 [ext_resource type="Script" path="res://demo/ai/tasks/get_first_in_group.gd" id="1_uvue5"]
 [ext_resource type="Script" path="res://demo/ai/tasks/pursue.gd" id="2_aanv5"]
@@ -28,8 +28,7 @@ animation_name = &"idle"
 blend = 0.1
 
 [sub_resource type="BTRandomWait" id="BTRandomWait_xlud8"]
-min_duration = 0.7
+max_duration = 3.0
-max_duration = 1.5
 
 [sub_resource type="BTAction" id="BTAction_c4cxo"]
 script = ExtResource("1_uvue5")
@@ -54,8 +53,8 @@ speed = 1.5
 script = ExtResource("2_fl3fr")
 target_var = "_target"
 closest_side = false
-range_min = 400.0
+range_min = 400
-range_max = 600.0
+range_max = 600
 position_var = "_flank_pos"
 
 [sub_resource type="BTAction" id="BTAction_66hsk"]
@@ -133,8 +132,10 @@ resource_name = "AnimationPlayer"
 animation_player = SubResource("BBNode_s6vt4")
 animation_name = &"throw_prepare"
 blend = 0.1
+speed = 0.7
 
 [sub_resource type="BTWait" id="BTWait_gbcyb"]
+duration = 1.3
 
 [sub_resource type="BBNode" id="BBNode_qkfqt"]
 saved_value = NodePath("AnimationPlayer")
@@ -154,9 +155,12 @@ resource_name = "."
 node = SubResource("BBNode_1yxc5")
 method = &"throw_ninja_star"
 
+[sub_resource type="BTRandomWait" id="BTRandomWait_2pmoe"]
+min_duration = 1.5
+
 [sub_resource type="BTSequence" id="BTSequence_rgbq3"]
 custom_name = "Throw ninja star"
-children = [SubResource("BTAction_8q20y"), SubResource("BTPlayAnimation_qa8jy"), SubResource("BTWait_gbcyb"), SubResource("BTPlayAnimation_0ktds"), SubResource("BTCallMethod_yx4fk")]
+children = [SubResource("BTAction_8q20y"), SubResource("BTPlayAnimation_qa8jy"), SubResource("BTWait_gbcyb"), SubResource("BTPlayAnimation_0ktds"), SubResource("BTCallMethod_yx4fk"), SubResource("BTRandomWait_2pmoe")]
 metadata/_weight_ = 1.0
 
 [sub_resource type="BTProbabilitySelector" id="BTProbabilitySelector_rjsiq"]

demo/demo/ai/trees/enemy_ranged.tres

@@ -1,9 +1,10 @@
-[gd_resource type="BehaviorTree" load_steps=29 format=3 uid="uid://cqluon1y1hnn5"]
+[gd_resource type="BehaviorTree" load_steps=40 format=3 uid="uid://cqluon1y1hnn5"]
 
 [ext_resource type="Script" path="res://demo/ai/tasks/get_first_in_group.gd" id="1_3j1v8"]
 [ext_resource type="Script" path="res://demo/ai/tasks/select_flanking_pos.gd" id="2_vbh52"]
 [ext_resource type="Script" path="res://demo/ai/tasks/arrive_pos.gd" id="3_20ffh"]
 [ext_resource type="Script" path="res://demo/ai/tasks/face_target.gd" id="4_x8yor"]
+[ext_resource type="Script" path="res://demo/ai/tasks/select_random_nearby_pos.gd" id="5_mexvv"]
 
 [sub_resource type="BlackboardPlan" id="BlackboardPlan_46tbn"]
 var/speed/name = "speed"
@@ -28,19 +29,55 @@ max_duration = 2.5
 [sub_resource type="BTAction" id="BTAction_c4cxo"]
 script = ExtResource("1_3j1v8")
 group = &"player"
-output_var = "_target"
+output_var = "target"
 
 [sub_resource type="BTSequence" id="BTSequence_yhjh1"]
 custom_name = "Take a break"
 children = [SubResource("BTPlayAnimation_qiw21"), SubResource("BTRandomWait_xlud8"), SubResource("BTAction_c4cxo")]
 
+[sub_resource type="BTComment" id="BTComment_qhsko"]
+custom_name = "He is bored attacking player all the time ;)"
+
+[sub_resource type="BTAction" id="BTAction_lpk67"]
+script = ExtResource("5_mexvv")
+range_min = 300.0
+range_max = 500.0
+position_var = "pos"
+
+[sub_resource type="BBNode" id="BBNode_ok0r5"]
+saved_value = NodePath("AnimationPlayer")
+resource_name = "AnimationPlayer"
+
+[sub_resource type="BTPlayAnimation" id="BTPlayAnimation_unftu"]
+animation_player = SubResource("BBNode_ok0r5")
+animation_name = &"walk"
+blend = 0.1
+
+[sub_resource type="BTAction" id="BTAction_apfsn"]
+script = ExtResource("3_20ffh")
+target_position_var = "pos"
+speed_var = "speed"
+tolerance = 50.0
+
+[sub_resource type="BTTimeLimit" id="BTTimeLimit_baob7"]
+time_limit = 3.0
+children = [SubResource("BTAction_apfsn")]
+
+[sub_resource type="BTSequence" id="BTSequence_0gdqn"]
+custom_name = "Random Walk"
+children = [SubResource("BTComment_qhsko"), SubResource("BTAction_lpk67"), SubResource("BTPlayAnimation_unftu"), SubResource("BTTimeLimit_baob7")]
+
+[sub_resource type="BTProbability" id="BTProbability_sat88"]
+run_chance = 0.3
+children = [SubResource("BTSequence_0gdqn")]
+
 [sub_resource type="BTAction" id="BTAction_kuuw2"]
 script = ExtResource("2_vbh52")
-target_var = "_target"
+target_var = "target"
 closest_side = true
-range_min = 400.0
+range_min = 400
-range_max = 1000.0
+range_max = 1000
-position_var = "_shoot_pos"
+position_var = "shoot_pos"
 
 [sub_resource type="BBNode" id="BBNode_kc64r"]
 saved_value = NodePath("AnimationPlayer")
@@ -53,7 +90,7 @@ blend = 0.1
 
 [sub_resource type="BTAction" id="BTAction_66hsk"]
 script = ExtResource("3_20ffh")
-target_position_var = "_shoot_pos"
+target_position_var = "shoot_pos"
 speed_var = "speed"
 tolerance = 50.0
 
@@ -62,10 +99,10 @@ children = [SubResource("BTAction_66hsk")]
 
 [sub_resource type="BTAction" id="BTAction_enw2m"]
 script = ExtResource("4_x8yor")
-target_var = "_target"
+target_var = "target"
 
 [sub_resource type="BTSequence" id="BTSequence_lhg7f"]
-custom_name = "Reposition"
+custom_name = "Get into position"
 children = [SubResource("BTAction_kuuw2"), SubResource("BTPlayAnimation_panch"), SubResource("BTTimeLimit_24ath"), SubResource("BTAction_enw2m")]
 metadata/_weight_ = 1.0
 
@@ -110,9 +147,16 @@ metadata/_weight_ = 1.0
 times = 3
 children = [SubResource("BTSequence_rgbq3")]
 
+[sub_resource type="BTSequence" id="BTSequence_h2tm0"]
+custom_name = "Align and shoot"
+children = [SubResource("BTSequence_lhg7f"), SubResource("BTRepeat_g08ia")]
+
+[sub_resource type="BTSelector" id="BTSelector_1rrya"]
+children = [SubResource("BTProbability_sat88"), SubResource("BTSequence_h2tm0")]
+
 [sub_resource type="BTSequence" id="BTSequence_pxl2k"]
 custom_name = "Main"
-children = [SubResource("BTSequence_yhjh1"), SubResource("BTSequence_lhg7f"), SubResource("BTRepeat_g08ia")]
+children = [SubResource("BTSequence_yhjh1"), SubResource("BTSelector_1rrya")]
 
 [resource]
 blackboard_plan = SubResource("BlackboardPlan_46tbn")