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--- godot [2024/03/15 14:16]
admin created
+++ godot [2024/04/08 19:33] (current)
admin
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 ====== Getting Started with Godot ======
+This event runs monthly on the **2nd Monday** of the month.  See the [[start|home page]] for the date of our next monthly event.
 For our regular monthly tutorial nights, we're basing our teaching on the wonderful series by [[https://www.youtube.com/@AJsLearningLab|AJ's Learning Lab]], [[https://www.youtube.com/playlist?list=PL4vjw0qHwNZIQZScBFaON0WGkz-BMyoCh|Godot FPS Tutorial - Learn Godot by making Wolfenstein 3D]].
@@ Line 5: / Line 6: @@
 He has made the assets he uses freely available (please consider donating) here: https://ajslearninglab.itch.io/boganstein-3d-learn-godot-4-with-wolfenstein-3d/
+All the code we use is available on AJ's Learning Lab github - https://github.com/AJsLearningLab/GodotFPS
+===== First Steps =====
+  * Download Godot from https://godotengine.org/download/ and install it (it's available on all platforms)
+  * Download the assets from AJ's Learning Lab here: https://ajslearninglab.itch.io/boganstein-3d-learn-godot-4-with-wolfenstein-3d/
+==== Part 1 ====
+**Goal: Learn about Godot, create a world/room (floor and walls)**
+  * New scene: click 3D Scene, rename to 'world'
+  * Create floor.  Add MeshInstance3D to scene
+  * Set Mesh type to 'New PlaneMesh'
+  * Change size.  Transform -> scale to 20
+  * Create collision mesh.  Using the 'Mesh' top button, choose 'Trimesh Static Body'.  That automatically creates a StaticBody3D of the correct type, and then adds a CollisionShape3D.
+  * New wall.  Create another new mesh.  This time the Mesh should be New BoxMesh'.  Move walls to edge, set z to 20
+  * Tweak the wall height, 'y to the sky', set to 10
+  * Duplicate for the other three walls
+==== Part 2 ====
+**Goal: Create a player character that can be controlled by the keyboard**
+  * New scene.  Click + next to the world scene.  Other node.  Search for CharacterBody3D.  Name it 'player'.
+  * Add subnode.  Click +, search for MeshInstance3D.  Set Mesh shape to Capsule shape.
+  * Fix the height.  Transform, adjust Y to 1m.
+  * Select player node, add new node, Camera3D.
+  * Adjust Camera height to eye height.
+  * Create script.  Select player node.  Use script+/scroll button.  Select a template for Basic movement.
+  * Add new variable.  ''const TURN_SPEED = 0.05''
+  * Add new code
+<code>
+if Input.is_action_pressed("ui_left"):
+  self.rotate_y(TURN_SPEED)
+if Input.is_action_pressed("ui_right"):
+  self.rotate_y(-TURN_SPEED)
+</code>
+  * Comment out the jump code
+  * In the world scene, drag the player scene into the world
+  * In the three dot menu (world scene), use 'Add Sun to scene', 'add environment to scene'
+  * In the player scene, use the Mesh button to add a 'Simplified Convex Collision Sibling' mesh to the player's MeshInstance3D (not 'Single', that'll cause performance issues - why?)
+  * Set up WASD controls in the Project Settings
+==== Part 3 ====
+**Goal: Add textures to the walls and floor**
+  * Import a texture by dragging it into the file system.
+  * Select a wall.  Use Geometry -> Material Override.  Select New StandardMaterial3D.  Click the sphere.  Expand Albedo.  Drag the texture to the 'Texture' input.
+  * Find UV1, experiment with the sizing, approx 30 x 10
+  * Apply to floor/other walls.
+==== Part 4 ====
+**Goal: Add a UI/HUD and a knife**
+  * Create new scene, other node: 'CanvasLayer', rename to 'ui'
+  * Create new node, AnimatedSprite2D
+  * Create new node, ColorRect
+  * In 2D view, size the ColorRect.  Layout -> Anchors -> Bottom Wide.  Set the colour to dark blue.
+  * Import wolfweapons.png
+  * Select Animated Sprite.  Expand Animation -> Sprite Frame.  Click New SpriteFrames.  Click it again to view the animation frame at the bottom.
+  * Rename default to 'knife_idle', set as default.
+  * Click grid, adjust, set up idle frame.
+  * Adjust position of animatedspirteframe in 2D view, use Transform->Scale to size up to 5
+  * Create new animation called 'stab'
+  * Add new stab animations, disable loop, set FPS to 16
+  * Click UI root node, add script. Enter the following code:
+<code file ui.gd>
+extends CanvasLayer
+var ammo = 0
+var current_weapon = "knife"
+func _ready():
+	$AnimatedSprite2D.animation_finished.connect(_on_AnimatedSprite2D_animation_finished)
+func _process(delta):
+	if Input.is_action_just_pressed("ui_select"):
+		if current_weapon == "knife":
+			$AnimatedSprite2D.play("stab")
+		elif current_weapon == "gun":
+			if ammo > 0:
+				$AnimatedSprite2D.play("shoot")
+				ammo -= 1
+func _on_AnimatedSprite2D_animation_finished():
+	if current_weapon == "knife":
+		$AnimatedSprite2D.play("knife_idle")
+	elif current_weapon == "gun":
+		$AnimatedSprite2D.play("gun_idle")
+</code>
+  * Add the ui scene to the player scene (Drag drop from file system onto player node)
+==== Part 5 ====
+**Goal:Add a hand gun, firing, add a global script**
+  * Add new handfun sprite animations ('gun_idle' and 'shoot').  Disable looping. (Adjust to 5x4 for grid)
+  * Edit the ui code, after the ''ammo -= 1'' line, add:
+<code>
+else:
+  current_weapon = "knife"
+  $AnimatedSprite2D.play("knife_idle")
+</code>
+  * Set the ammo and current_weapon to 'gun'.  Test.
+  * Create a global script.  File -> New Script (based on Node).  Name it global.
+  * Move the ammo and current weapon variables from the player script to the global script.
+  * Open the project settings, in Autoload, add the global script and mark it global
+  * Tweak the project setting page, allow fullscreen too
+  * Edit the ui.gd script and change all references to current_weapon and ammo to be Global.current_weapon and Global.ammo
+  * Test everything still works
+==== Part 6 ====
+**Goal: More weapons**
+  * Edit the ui AnimatedSprite2D, add new animations/sprites
+  * Rename 'shoot' to gun_shoot
+  * Add new variables to ui.gd script
+<code>
+var time_since_last_shot = 0.0
+var fire_rate = 1.0
+</code>
+  * Add a line to the _ready() function
+<code>
+$AnimatedSprite2D.play(Global.current_weapon + "_idle")
+</code>
+  * Add some lines to the start of the _process() function
+<code>
+time_since_last_shot += delta
+var can_shoot = time_since_last_shot >= (1.0 / fire_rate)
+if Global.current_weapon != "knife" and Global.ammo <= 0:
+  Global.current_weapon = "knife"
+  $AnimatedSprite2D.play("knife_idle")
+</code>
+  * Tweak first if statement, change to:
+<code>
+if Input.is_action_pressed("ui_select") and can_shoot:
+</code>
+  * Remove everything after the stab line, and add
+<code>
+else:
+  $AnimatedSprite2D.play(Global.current_weapon + "_shoot")
+time_since_last_shot = 0.0
+if Global.current_weapon != "knife":
+  if Global.ammo > 0:
+    Global.ammo -= 1
+match Global.current_weapon:
+  "gun":
+    fire_rate = 3.0
+  "machine":
+    fire_rate = 6.0
+  "mini":
+    fire_rate = 10.0
+  "knife":
+    fire_rate = 2.0
+  _:
+    fire_rate = 1.0
+func _on_AnimatedSprite2D_animation_finished():
+  $AnimatedSprite2D.play(Global.current_weapon + "_idle")
+</code>
+The full code for ui.gd should now be:
+<code file ui.gd>
+extends CanvasLayer
+var time_since_last_shot = 0.0
+var fire_rate = 1.0
+func _ready():
+	$AnimatedSprite2D.animation_finished.connect(_on_AnimatedSprite2D_animation_finished)
+	$AnimatedSprite2D.play(Global.current_weapon + "_idle")
+func _process(delta):
+	time_since_last_shot += delta
+	var can_shoot = time_since_last_shot >= (1.0 / fire_rate)
+	if Global.current_weapon != "knife" and Global.ammo <= 0:
+		Global.current_weapon = "knife"
+		$AnimatedSprite2D.play("knife_idle")
+	if Input.is_action_pressed("ui_select") and can_shoot:
+		if Global.current_weapon == "knife":
+			$AnimatedSprite2D.play("stab")
+		else:
+			$AnimatedSprite2D.play(Global.current_weapon + "_shoot")
+		time_since_last_shot = 0.0
+		if Global.current_weapon != "knife":
+			if Global.ammo > 0:
+				Global.ammo -= 1
+	match Global.current_weapon:
+		"gun":
+			fire_rate = 3.0
+		"machine":
+			fire_rate = 6.0
+		"mini":
+			fire_rate = 10.0
+		"knife":
+			fire_rate = 2.0
+		_:
+			fire_rate = 1.0
+func _on_AnimatedSprite2D_animation_finished():
+	$AnimatedSprite2D.play(Global.current_weapon + "_idle")
+</code>
+==== Part 7 ====
+**Goal: Add enemies**
+  * Create new scene.  Other node->CharacterBody3D.  Name it guard.
+  * Add two children to the enemy node.  A CollisionShape3D (set to capsule), and a AnimatedSprite3D.
+  * Set the Y to 1, to make it on the floor.  Adjust the capsule size to be 2m.
+  * Import the guard sprite to the file system.
+  * Select the AnimatedSprite3D, Click Sprite Frame-> New Sprite Frame.  Click it again to set a default animation using the grid, set to 7x2
+  * Adjust the eize, choose AnimatedSprite3D.  Transform -> y =1, scale = 4 ish.
+  * A new animations, 'die' and 'shoot'
+  * Select the AnimatedSprite3D, in the inspector find 'Flags', enable 'Billboard - Y:Billboard'
+  * Edit the player script and add this line to the _ready() function:
+<code>
+add_to_group("player")
+</code>
+  * Select the guard root node.  Create a new script, use the code below:
+<code guard.gd>
+extends CharacterBody3D
+@onready var player : CharacterBody3D = get_tree().get_first_node_in_group("player")
+const SPEED = 5.0
+var gravity = ProjectSettings.get_setting("physics/3d/default_gravity")  # Get the gravity from the project settings to be synced with RigidBody nodes.
+var dead = false
+var is_attacking = false
+var attack_range = 5
+func _ready():
+	add_to_group("enemy")
+func _physics_process(delta):
+	if dead or is_attacking:  # Check if the enemy is dead or attacking
+		return
+	if player == null:
+		return
+	var dir = player.global_position - global_position
+	dir.y = 0.0
+	dir = dir.normalized()
+	velocity = dir * SPEED
+	# Add the gravity.
+	if not is_on_floor():
+		velocity.y -= gravity * delta
+	move_and_slide()
+	attack()
+func attack():
+	var dist_to_player = global_position.distance_to(player.global_position)
+	if dist_to_player > attack_range:
+		return
+	else:
+		is_attacking = true  # Set the attacking flag
+		$AnimatedSprite3D.play("shoot")
+		await $AnimatedSprite3D.animation_finished  # Wait for the animation to finish
+		is_attacking = false  # Reset the attacking flag
+func die():
+	dead = true  # Corrected variable scope
+	$AnimatedSprite3D.play("die")
+	$CollisionShape3D.disabled = true
+</code>
+==== Part 8 ====
+**Goal: Enemy Death and Raycasting**
+  * Edit the ui.gd script.  Tweak the can_shoot variable, set it in the object scope (top) and remove "var" from "var can_shoot" from the _process()
+  * Access the 3D view of the player.  Add a new node as a child of the camera 3D, type: RayCast3D
+  * Set the target position to y:0, z: -20
+  * Make sure the raycast has access to collision mask layers 1+2
+  * Check the guard scene, collision should be on layer 2, mask 1+2
+  * Check Player is layer 1, mask is 1+2
+  * Edit the player script, add new const at the top
+<code>
+@onready var ui_script = $ui
+@onready var ray = $Camera3D/RayCast3D
+</code>
+  * At the bottom, just above move_and_slide(), add the following code:
+<code>
+if Input.is_action_just_pressed("ui_accept"):
+  if ui_script.can_shoot:
+    shoot()
+</code>
+  * Add the shoot function
+<code bash>
+func shoot():
+  if ray.is_colliding() and ray.get_collider().has_method("die"):
+    ray.get_collider().die()
+</code>
+  * To allow strafing, change the ''If Input.is_action_just_pressed("ui_accept"):'' to
+<code>
+if Input.is_action_pressed("ui_accept"):
+</code>
+===== Part 9 =====
+**Goal: HUD labels and player death**
+  * Add a player health variable to the player.gd script
+<code>
+var player_health = 100
+</code>
+  * Create two new Label nodes as a child of the UI, name one 'health'.
+  * Create a new function in the ui.gd script
+<code>
+function update_player_health():
+  $health.text = str(get_parent().player_health)
+</code>
+  * Add the function to the bottom of the _process() function in the ui.gd script
+<code>
+update_player_health()
+</code>
+  * Edit the player script and add a new function:
+<code>
+func damage():
+  player_health -= 10
+  print(player_health)
+  if player_health <= 0:
+    queue_free()
+</code>
+  * Add a RayCast3D to the guard scene
+  * Set Y = 0, Z = 5
+  * After the ''play(shoot)'' line in the attack() function, add:
+<code>
+if $RayCast3D.is_colliding() and $RayCast3D.get_collider().has_method('damage'):
+  $RayCast3D.get_collider().damage()
+</code>
+===== Part 10 =====
+**Goal: Ammo pickups**
+===== Next Steps =====
+**Goal: Add sound effects**
+  * Import the sound effect files (gun.ogg, machine.ogg, mini.ogg)
+  * In the player scene, add a new node, AudioStreamPlayer.
+  * Add the following code to the player shoot() function:
+<code>
+var sound_player = $AudioStreamPlayer
+match Global.current_weapon:
+  "gun":
+    sound_player.stream = preload("res://gun.ogg")
+  "machine":
+    sound_player.stream = preload("res://machine.ogg")
+  "mini":
+    sound_player.stream = preload("res://mini.ogg")
+sound_player.play()
+</code>

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