feat(game): Scrolling clouds in the background (#110)

Closes #108

examples/forest-brawl/maps/three-peaks.tscn

@@ -1,12 +1,15 @@
-[gd_scene load_steps=9 format=3 uid="uid://d1544gxqaoptc"]
+[gd_scene load_steps=11 format=3 uid="uid://d1544gxqaoptc"]
 
 [ext_resource type="MeshLibrary" uid="uid://do0y7f0sy12jg" path="res://examples/forest-brawl/models/forest-blocks.meshlib" id="1_124j6"]
 [ext_resource type="PackedScene" uid="uid://ijqx6kjl3qf4" path="res://examples/forest-brawl/scenes/powerup.tscn" id="2_4e2nk"]
 [ext_resource type="PackedScene" uid="uid://c12hb5btenkcy" path="res://examples/forest-brawl/scenes/doodads/clouds-1.tscn" id="3_ucvrj"]
 [ext_resource type="PackedScene" uid="uid://c5l8x303sjqhs" path="res://examples/forest-brawl/scenes/doodads/clouds-2.tscn" id="4_dfl7h"]
 [ext_resource type="PackedScene" uid="uid://dq14vitb32x5p" path="res://examples/forest-brawl/scenes/doodads/clouds-3.tscn" id="5_doyli"]
+[ext_resource type="Script" path="res://examples/forest-brawl/scripts/cloud-area3d.gd" id="6_ymimw"]
 
 [sub_resource type="ProceduralSkyMaterial" id="ProceduralSkyMaterial_xjsj7"]
+sky_top_color = Color(0.384314, 0.454902, 0.54902, 1)
+ground_bottom_color = Color(0.3136, 0.420373, 0.56, 1)
 
 [sub_resource type="Sky" id="Sky_g0uhm"]
 sky_material = SubResource("ProceduralSkyMaterial_xjsj7")
@@ -16,6 +19,9 @@ background_mode = 2
 sky = SubResource("Sky_g0uhm")
 tonemap_mode = 2
 
+[sub_resource type="BoxShape3D" id="BoxShape3D_4u8tk"]
+size = Vector3(240, 48, 120)
+
 [node name="Three Peaks Map" type="Node3D"]
 
 [node name="GridMap" type="GridMap" parent="."]
@@ -28,6 +34,9 @@ data = {
 }
 metadata/_editor_floor_ = Vector3(0, 0, 0)
 
+[node name="Mountain Clouds" parent="." instance=ExtResource("3_ucvrj")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 17.8236, -4.03231, 11.082)
+
 [node name="Powerups" type="Node" parent="."]
 
 [node name="Powerup" parent="Powerups" instance=ExtResource("2_4e2nk")]
@@ -73,6 +82,7 @@ environment = SubResource("Environment_c7ydc")
 
 [node name="Clouds" type="Node3D" parent="."]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -20, 0)
+visible = false
 
 [node name="Clouds 1" parent="Clouds" instance=ExtResource("3_ucvrj")]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -20.6817, 0, -3.66238)
@@ -122,5 +132,15 @@ transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 79.7221, 0, 4.68955)
 [node name="Clouds 16" parent="Clouds" instance=ExtResource("5_doyli")]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -71.8085, 0, 21.5426)
 
-[node name="Clouds 17" parent="Clouds" instance=ExtResource("3_ucvrj")]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 17.8236, 15.8221, 11.082)
+[node name="Area3D" type="Area3D" parent="."]
+monitoring = false
+monitorable = false
+script = ExtResource("6_ymimw")
+clouds = Array[PackedScene]([ExtResource("3_ucvrj"), ExtResource("4_dfl7h"), ExtResource("5_doyli")])
+count = 24
+float_speed_min = 0.25
+float_speed_max = 2.0
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="Area3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -34, 0)
+shape = SubResource("BoxShape3D_4u8tk")

examples/forest-brawl/scripts/cloud-area3d.gd

@@ -0,0 +1,65 @@
+extends Area3D
+
+@export var clouds: Array[PackedScene] = []
+@export var count: int = 16
+
+@export var float_direction: Vector3 = Vector3.RIGHT
+@export var float_speed_min: float = 4.0
+@export var float_speed_max: float = 8.0
+
+var _clouds: Array[Node3D] = []
+var _speeds: Array[float] = []
+var _aabb: AABB
+
+func _ready():
+	_aabb = _find_aabb()
+	if not _aabb.has_volume():
+		push_error("CloudArea required a box shape!")
+		queue_free()
+		return
+
+	for i in range(count):
+		var cloud = _spawn_cloud()
+		cloud.position = _aabb.position + _aabb.size * Vector3(randf(), randf(), randf())
+
+		_clouds.push_back(cloud)
+		_speeds.push_back(randf_range(float_speed_min, float_speed_max))
+
+func _process(delta):
+	for i in range(count):
+		var cloud = _clouds[i]
+		var speed = _speeds[i]
+
+		cloud.position += float_direction * speed * delta
+
+		if not _aabb.has_point(cloud.position):
+			cloud.queue_free()
+
+			cloud = _spawn_cloud()
+			cloud.position = _aabb.position + _aabb.size * \
+				Vector3(randf(), randf(), randf()) * \
+				(Vector3.ONE * 0.5 - float_direction * 0.5)
+
+			_clouds[i] = cloud
+			_speeds[i] = randf_range(float_speed_min, float_speed_max)
+
+func _spawn_cloud() -> Node3D:
+	var cloud_template = clouds.pick_random() as PackedScene
+	var cloud = cloud_template.instantiate() as Node3D
+	add_child(cloud)
+	cloud.owner = self
+
+	return cloud
+
+func _find_aabb() -> AABB:
+	var shape_owners = get_shape_owners()
+	for shape_owner in shape_owners:
+		for i in range(shape_owner_get_shape_count(shape_owner)):
+			var shape = shape_owner_get_shape(shape_owner, i)
+
+			if shape is BoxShape3D:
+				var pos = shape_owner_get_transform(shape_owner).origin
+				var size = shape.size
+				return AABB(pos - size / 2, size)
+
+	return AABB(Vector3.ZERO, Vector3.ZERO)