Attention: Here be dragons
This is the latest
(unstable) version of this documentation, which may document features
not available in or compatible with released stable versions of Godot.
Checking the stable version of the documentation...
Matando o Jogador
Podemos matar inimigos pulando sobre eles, mas o jogador ainda não pode morrer. Vamos corrigir isso.
Queremos detectar ao sermos atingidos por um inimigo de uma forma diferente de esmagá-los. Queremos que o jogador morra quando estiver se movendo no chão, mas não se ele estiver no ar. Poderíamos usar matemática vetorial para distinguir os dois tipos de colisões. Ao invés disso, usaremos um nó Area3D, que funciona bem para as caixas de impacto (hitboxes).
Caixa de colisão com o nó Área
Volte para a cena player.tscn e adicione um novo nó filho Area3D. Nomeie-o MobDetector. Adicione um nó CollisionShape3D como filho dele.

No Inspetor, atribua uma forma de cilindro a ele.

Aqui está uma dica que você pode usar para fazer as colisões só acontecerem quando o jogador estiver no chão ou perto dele. Você pode reduzir a altura do cilindro e movê-lo até o topo do personagem. Desta forma, quando o jogador pula, a forma será muito alta para os inimigos colidirem com ela.

Você também quer que o cilindro seja mais largo do que a esfera. Desta forma, o jogador é atingido antes de colidir e ser empurrado para cima da caixa de colisão do monstro.
Quanto mais largo o cilindro, mais facilmente o jogador será morto.
Em seguida, selecione novamente o nó MobDetector, e no Inspetor, desligue sua propriedade Monitorável. Isto faz com que outros nós de física não possam detectar a área. A propriedade complementar Monitoramento lhe permite detectar colisões. Em seguida, remover a Colisão -> Camada e colocar a máscara na camada "inimigos".

When areas detect a collision, they emit signals. We're going to connect
one to the Player node. Select MobDetector and go to the Signals dock, double-click the
body_entered signal and connect it to the Player

O MobDetector irá emitir body_entered quando um CharacterBody3D ou um RigidBody3D entrar nele. Como ele apenas observa as camadas físicas "inimigas", ele só detectará os nós Inimigo.
Em termos de código, faremos duas coisas: emitir um sinal que usaremos posteriormente para encerrar o jogo e destruir o jogador. Podemos agrupar essas operações em uma função die() que nos ajuda a colocar um rótulo descritivo no código.
# Emitted when the player was hit by a mob.
# Put this at the top of the script.
signal hit
# And this function at the bottom.
func die():
hit.emit()
queue_free()
func _on_mob_detector_body_entered(body):
die()
// Don't forget to rebuild the project so the editor knows about the new signal.
// Emitted when the player was hit by a mob.
[Signal]
public delegate void HitEventHandler();
// ...
private void Die()
{
EmitSignal(SignalName.Hit);
QueueFree();
}
// We also specified this function name in PascalCase in the editor's connection window.
private void OnMobDetectorBodyEntered(Node3D body)
{
Die();
}
Terminando o jogo
Podemos utilizar o sinal hit do Player para terminar o jogo. Tudo o que precisamos fazer é conectá-lo ao nó Main e parar a reação do Main.
Open main.tscn, select the Player node, and in the Signals dock,
connect its hit signal to the Main node.

Obtenha o temporizador, e pare-o, na função _on_player_hit().
func _on_player_hit():
$MobTimer.stop()
// We also specified this function name in PascalCase in the editor's connection window.
private void OnPlayerHit()
{
GetNode<Timer>("MobTimer").Stop();
}
Se você testar o jogo agora, os monstros deixarão de surgir quando você morrer, e os outros deixarão a tela.
Observe também que o jogo não trava mais, e nem exibe um erro quando o jogador morre. Como estamos parando o MobTimer, ele não aciona mais a função _on_mob_timer_timeout().
Observe também que o inimigo colidindo com o jogador e morrendo depende do tamanho e da posição das formas de colisão do Player e Mob. Talvez seja necessário movê-las e redimensioná-las para conseguir uma jogabilidade mais desafiante.
You can pat yourself on the back: you prototyped a complete 3D game, even if it's still a bit rough.
A partir daí, acrescentaremos uma pontuação, a opção de tentar novamente o jogo, e você verá como pode fazer o jogo se parecer muito mais vivo com animações minimalistas.
Programar o Ponto de controle(checkpoint)
Aqui estão os scripts completos para os nós Main, Mob e Player, para referência. Você pode usá-los para comparar e verificar seu código.
Começando com main.gd.
extends Node
@export var mob_scene: PackedScene
func _on_mob_timer_timeout():
# Create a new instance of the Mob scene.
var mob = mob_scene.instantiate()
# Choose a random location on the SpawnPath.
# We store the reference to the SpawnLocation node.
var mob_spawn_location = get_node("SpawnPath/SpawnLocation")
# And give it a random offset.
mob_spawn_location.progress_ratio = randf()
var player_position = $Player.position
mob.initialize(mob_spawn_location.position, player_position)
# Spawn the mob by adding it to the Main scene.
add_child(mob)
func _on_player_hit():
$MobTimer.stop()
using Godot;
public partial class Main : Node
{
[Export]
public PackedScene MobScene { get; set; }
private void OnMobTimerTimeout()
{
// Create a new instance of the Mob scene.
Mob mob = MobScene.Instantiate<Mob>();
// Choose a random location on the SpawnPath.
// We store the reference to the SpawnLocation node.
var mobSpawnLocation = GetNode<PathFollow3D>("SpawnPath/SpawnLocation");
// And give it a random offset.
mobSpawnLocation.ProgressRatio = GD.Randf();
Vector3 playerPosition = GetNode<Player>("Player").Position;
mob.Initialize(mobSpawnLocation.Position, playerPosition);
// Spawn the mob by adding it to the Main scene.
AddChild(mob);
}
private void OnPlayerHit()
{
GetNode<Timer>("MobTimer").Stop();
}
}
Next is mob.gd.
extends CharacterBody3D
# Minimum speed of the mob in meters per second.
@export var min_speed = 10
# Maximum speed of the mob in meters per second.
@export var max_speed = 18
# Emitted when the player jumped on the mob
signal squashed
func _physics_process(_delta):
move_and_slide()
# This function will be called from the Main scene.
func initialize(start_position, player_position):
# We position the mob by placing it at start_position
# and rotate it towards player_position, so it looks at the player.
look_at_from_position(start_position, player_position, Vector3.UP)
# Rotate this mob randomly within range of -45 and +45 degrees,
# so that it doesn't move directly towards the player.
rotate_y(randf_range(-PI / 4, PI / 4))
# We calculate a random speed (integer)
var random_speed = randi_range(min_speed, max_speed)
# We calculate a forward velocity that represents the speed.
velocity = Vector3.FORWARD * random_speed
# We then rotate the velocity vector based on the mob's Y rotation
# in order to move in the direction the mob is looking.
velocity = velocity.rotated(Vector3.UP, rotation.y)
func _on_visible_on_screen_notifier_3d_screen_exited():
queue_free()
func squash():
squashed.emit()
queue_free() # Destroy this node
using Godot;
public partial class Mob : CharacterBody3D
{
// Emitted when the played jumped on the mob.
[Signal]
public delegate void SquashedEventHandler();
// Minimum speed of the mob in meters per second
[Export]
public int MinSpeed { get; set; } = 10;
// Maximum speed of the mob in meters per second
[Export]
public int MaxSpeed { get; set; } = 18;
public override void _PhysicsProcess(double delta)
{
MoveAndSlide();
}
// This function will be called from the Main scene.
public void Initialize(Vector3 startPosition, Vector3 playerPosition)
{
// We position the mob by placing it at startPosition
// and rotate it towards playerPosition, so it looks at the player.
LookAtFromPosition(startPosition, playerPosition, Vector3.Up);
// Rotate this mob randomly within range of -45 and +45 degrees,
// so that it doesn't move directly towards the player.
RotateY((float)GD.RandRange(-Mathf.Pi / 4.0, Mathf.Pi / 4.0));
// We calculate a random speed (integer)
int randomSpeed = GD.RandRange(MinSpeed, MaxSpeed);
// We calculate a forward velocity that represents the speed.
Velocity = Vector3.Forward * randomSpeed;
// We then rotate the velocity vector based on the mob's Y rotation
// in order to move in the direction the mob is looking.
Velocity = Velocity.Rotated(Vector3.Up, Rotation.Y);
}
public void Squash()
{
EmitSignal(SignalName.Squashed);
QueueFree(); // Destroy this node
}
private void OnVisibilityNotifierScreenExited()
{
QueueFree();
}
}
Finally, the longest script, player.gd:
extends CharacterBody3D
signal hit
# How fast the player moves in meters per second
@export var speed = 14
# The downward acceleration while in the air, in meters per second squared.
@export var fall_acceleration = 75
# Vertical impulse applied to the character upon jumping in meters per second.
@export var jump_impulse = 20
# Vertical impulse applied to the character upon bouncing over a mob
# in meters per second.
@export var bounce_impulse = 16
var target_velocity = Vector3.ZERO
func _physics_process(delta):
# We create a local variable to store the input direction
var direction = Vector3.ZERO
# We check for each move input and update the direction accordingly
if Input.is_action_pressed("move_right"):
direction.x = direction.x + 1
if Input.is_action_pressed("move_left"):
direction.x = direction.x - 1
if Input.is_action_pressed("move_back"):
# Notice how we are working with the vector's x and z axes.
# In 3D, the XZ plane is the ground plane.
direction.z = direction.z + 1
if Input.is_action_pressed("move_forward"):
direction.z = direction.z - 1
# Prevent diagonal moving fast af
if direction != Vector3.ZERO:
direction = direction.normalized()
# Setting the basis property will affect the rotation of the node.
$Pivot.basis = Basis.looking_at(direction)
# Ground Velocity
target_velocity.x = direction.x * speed
target_velocity.z = direction.z * speed
# Vertical Velocity
if not is_on_floor(): # If in the air, fall towards the floor. Literally gravity
target_velocity.y = target_velocity.y - (fall_acceleration * delta)
# Jumping.
if is_on_floor() and Input.is_action_just_pressed("jump"):
target_velocity.y = jump_impulse
# Iterate through all collisions that occurred this frame
# in C this would be for(int i = 0; i < collisions.Count; i++)
for index in range(get_slide_collision_count()):
# We get one of the collisions with the player
var collision = get_slide_collision(index)
# If the collision is with ground
if collision.get_collider() == null:
continue
# If the collider is with a mob
if collision.get_collider().is_in_group("mob"):
var mob = collision.get_collider()
# we check that we are hitting it from above.
if Vector3.UP.dot(collision.get_normal()) > 0.1:
# If so, we squash it and bounce.
mob.squash()
target_velocity.y = bounce_impulse
# Prevent further duplicate calls.
break
# Moving the Character
velocity = target_velocity
move_and_slide()
# And this function at the bottom.
func die():
hit.emit()
queue_free()
func _on_mob_detector_body_entered(body):
die()
using Godot;
public partial class Player : CharacterBody3D
{
// Emitted when the player was hit by a mob.
[Signal]
public delegate void HitEventHandler();
// How fast the player moves in meters per second.
[Export]
public int Speed { get; set; } = 14;
// The downward acceleration when in the air, in meters per second squared.
[Export]
public int FallAcceleration { get; set; } = 75;
// Vertical impulse applied to the character upon jumping in meters per second.
[Export]
public int JumpImpulse { get; set; } = 20;
// Vertical impulse applied to the character upon bouncing over a mob in meters per second.
[Export]
public int BounceImpulse { get; set; } = 16;
private Vector3 _targetVelocity = Vector3.Zero;
public override void _PhysicsProcess(double delta)
{
// We create a local variable to store the input direction.
var direction = Vector3.Zero;
// We check for each move input and update the direction accordingly.
if (Input.IsActionPressed("move_right"))
{
direction.X += 1.0f;
}
if (Input.IsActionPressed("move_left"))
{
direction.X -= 1.0f;
}
if (Input.IsActionPressed("move_back"))
{
// Notice how we are working with the vector's X and Z axes.
// In 3D, the XZ plane is the ground plane.
direction.Z += 1.0f;
}
if (Input.IsActionPressed("move_forward"))
{
direction.Z -= 1.0f;
}
// Prevent diagonal moving fast af
if (direction != Vector3.Zero)
{
direction = direction.Normalized();
// Setting the basis property will affect the rotation of the node.
GetNode<Node3D>("Pivot").Basis = Basis.LookingAt(direction);
}
// Ground Velocity
_targetVelocity.X = direction.X * Speed;
_targetVelocity.Z = direction.Z * Speed;
// Vertical Velocity
if (!IsOnFloor()) // If in the air, fall towards the floor. Literally gravity
{
_targetVelocity.Y -= FallAcceleration * (float)delta;
}
// Jumping.
if (IsOnFloor() && Input.IsActionJustPressed("jump"))
{
_targetVelocity.Y = JumpImpulse;
}
// Iterate through all collisions that occurred this frame.
for (int index = 0; index < GetSlideCollisionCount(); index++)
{
// We get one of the collisions with the player.
KinematicCollision3D collision = GetSlideCollision(index);
// If the collision is with a mob.
if (collision.GetCollider() is Mob mob)
{
// We check that we are hitting it from above.
if (Vector3.Up.Dot(collision.GetNormal()) > 0.1f)
{
// If so, we squash it and bounce.
mob.Squash();
_targetVelocity.Y = BounceImpulse;
// Prevent further duplicate calls.
break;
}
}
}
// Moving the Character
Velocity = _targetVelocity;
MoveAndSlide();
}
private void Die()
{
EmitSignal(SignalName.Hit);
QueueFree();
}
private void OnMobDetectorBodyEntered(Node3D body)
{
Die();
}
}
Nos vemos na próxima lição para adicionar a pontuação e a opção de nova tentativa.