84 lines
3.0 KiB
GDScript
84 lines
3.0 KiB
GDScript
"""
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This script implements source style movement.
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"""
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extends CharacterBody3D
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## The locomotion settings of the current state.
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@export var state_machine: StateMachine
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## The direction the actor wishes to move in.
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@export var wish_dir: Vector3
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## The height the head attachment should be placed at according to the collider height.
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@export var head_height: float
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@onready var step_collider: CollisionShape3D = $StepCollider
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@onready var locomotion_collider: CollisionShape3D = $LocomotionCollider
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@onready var shape_cast: ShapeCast3D = $ShapeCast3D
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func get_current_settings() -> LocomotionSettings:
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if state_machine.CURRENT_STATE is LocomotionState:
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return state_machine.CURRENT_STATE.settings
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return null
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func accelerate(max_velocity: float, delta: float) -> Vector3:
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var current_speed = velocity.dot(wish_dir)
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var add_speed = clamp(max_velocity - current_speed, 0, get_current_settings().MAX_ACCELERATION * delta)
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return velocity + add_speed * wish_dir
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func update_velocity(delta: float, apply_friction: bool = true) -> Vector3:
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update_step_collider_position()
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if apply_friction:
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var speed = velocity.length()
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if speed != 0:
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var control = max(get_current_settings().STOP_SPEED, speed)
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var drop = control * get_current_settings().FRICTION * delta
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velocity *= max(speed - drop, 0) / speed
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return accelerate(get_current_settings().MAX_VELOCITY, delta)
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func update_step_collider_position():
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var step_shape: SeparationRayShape3D = step_collider.shape
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var collider_shape: CylinderShape3D = locomotion_collider.shape
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var greatest_vector: Vector3
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if wish_dir.length() > velocity.length():
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greatest_vector = wish_dir
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else:
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greatest_vector = velocity
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if not wish_dir == Vector3.ZERO:
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var current_step_collider_position: Vector3 = greatest_vector.normalized().rotated(Vector3.UP, -rotation.y) * (collider_shape.radius + 0.4)
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step_collider.position = Vector3(current_step_collider_position.x, step_shape.length, current_step_collider_position.z)
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func has_collision_above(h: float) -> bool:
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shape_cast.add_exception(self)
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shape_cast.shape.height = h - 0.1
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shape_cast.position.y = h / 2 + 0.05
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return not shape_cast.collision_result.is_empty()
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## Needs a cleanup pass
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var duration: float = .5
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var elapsed_time = 0.0
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func update_collider_height(delta: float, h: float = get_current_settings().HEIGHT) -> bool:
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var t = clamp(elapsed_time / duration, 0, 1)
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var current_collider_shape: CylinderShape3D = locomotion_collider.shape
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if t == 1.0 and current_collider_shape.height >= h - 0.01:
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return true
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if current_collider_shape.height < h and t < 1.0:
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shape_cast.add_exception(self)
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shape_cast.shape.height = h - 0.1
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shape_cast.position.y = h / 2 + 0.05
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if not shape_cast.collision_result.is_empty():
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return false
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locomotion_collider.shape.height = lerpf(current_collider_shape.height, h, t)
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locomotion_collider.position.y = locomotion_collider.shape.height / 2
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head_height = locomotion_collider.shape.height - 0.1
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elapsed_time += delta
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return false
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