bee
52 lines
1.9 KiB
GDScript
52 lines
1.9 KiB
GDScript
class_name Boat
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extends FloatingBody
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## All force values are per-kilogram (they get multiplied by mass), so the
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## boat handles the same if you change its mass later.
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@export var engine_power := 12.0 # forward thrust, m/s² at full throttle
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@export var reverse_ratio := 0.4 # reverse is weaker, like a real prop
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@export var throttle_response := 1.5 # how fast the engine spools up/down
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@export var rudder_strength := 2.5 # turning torque at speed
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@export var keel_grip := 3.0 # resistance to sliding sideways
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var desired_throttle := 0.0
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var throttle := 0.0
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func _physics_process(delta: float) -> void:
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super(delta)
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if Input.is_action_pressed("throttle_increase"):
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desired_throttle = move_toward(desired_throttle, 1, 0.005)
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elif Input.is_action_pressed("throttle_decrease"):
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desired_throttle = move_toward(desired_throttle, -1, 0.006)
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elif Input.is_action_pressed("throttle_stop"):
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desired_throttle = 0.0
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throttle = move_toward(throttle, desired_throttle, throttle_response * delta)
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if submerged_ratio <= 0.0:
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return # airborne: no thrust, no rudder, no keel
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# boat's forward direction, flattened onto the water plane
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var forward := -global_basis.z
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forward.y = 0.0
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forward = forward.normalized()
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# --- engine ---
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var power := engine_power * (reverse_ratio if throttle < 0.0 else 1.0)
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apply_central_force(forward * throttle * power * mass * submerged_ratio)
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# --- rudder: only bites when water flows past it ---
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var steer_input := Input.get_axis("rudder_right", "rudder_left")
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var forward_speed := linear_velocity.dot(forward)
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var rudder_bite := clampf(forward_speed / 3.0, -1.0, 1.0)
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apply_torque(Vector3.UP * steer_input * rudder_strength * rudder_bite * mass * submerged_ratio)
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# --- keel: kill sideways sliding ---
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var right := global_basis.x
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right.y = 0.0
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right = right.normalized()
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var lateral_speed := linear_velocity.dot(right)
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apply_central_force(-right * lateral_speed * keel_grip * mass * submerged_ratio)
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