Boat/Boats/buyancy_probe.gd

@icon("uid://ck86evu4iyhyg")
@tool
extends Marker3D
class_name BuyancyProbe

## How much force is applied upward
@export var float_strength: float = 10.0
@export var max_float_force:float = 500.0
var currentdepth:float

@export_category("Debug")
@export var show_probe :bool = false
var sphere_preview:MeshInstance3D
@onready var debug_sphere:SphereMesh = SphereMesh.new()

@export_category("Wave")
var noise: Image
var wave_speed: float = 1.0 
var noise_scale: float
var height_scale: float
@onready var ocean_mat: ShaderMaterial = preload("uid://cf3lxmfb2d7c8")
@onready var gravity: float = ProjectSettings.get_setting("physics/3d/default_gravity")
@onready var OceanNode:Ocean = get_tree().get_first_node_in_group("Ocean")
var Oceantime:float

@onready var parentRigid:RigidBody3D = get_parent()

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	if ocean_mat != null:
		update_param()
	if show_probe:
		sphere_preview = MeshInstance3D.new()
		sphere_preview.set_name("Sphere")
		add_child(sphere_preview)
		debug_sphere.radius = 0.1
		debug_sphere.height = 0.2
		sphere_preview.mesh = debug_sphere
		
func _physics_process(_delta: float) -> void:
	if not Engine.is_editor_hint():
		var depth = get_wave_height(global_position,Oceantime) - global_position.y
		#print(depth)
		if depth > 0.0 && parentRigid != null:
			var float_force  = parentRigid.mass * float_strength
			parentRigid.gravity_scale = 0.3
			parentRigid.angular_damp = 5.0
			parentRigid.apply_force(Vector3.UP * clamp(gravity * depth * float_force,-max_float_force,max_float_force) ,global_position-parentRigid.global_position)
		else:
			parentRigid.gravity_scale = 1.0
			parentRigid.angular_damp = 0.0

func _process(_delta: float) -> void:
	if OceanNode != null:
		Oceantime = OceanNode.wave_time
		if show_probe && sphere_preview != null:
			sphere_preview.global_position = global_position
			sphere_preview.global_position.y = get_wave_height(global_position,Oceantime)
			
		
		
	
# Calculate the wave height using a sine function.
func get_wave_height(world_position: Vector3, time: float) -> float:
	var uv_x = wrapf(world_position.x / noise_scale + time * wave_speed, 0, 1)
	var uv_y = wrapf(world_position.z / noise_scale + time * wave_speed, 0, 1)

	var pixel_pos = Vector2(uv_x * noise.get_width(), uv_y * noise.get_height())
	return OceanNode.global_position.y + noise.get_pixelv(pixel_pos).r * height_scale;
	
func update_param():
	if ocean_mat != null:
		wave_speed = ocean_mat.get_shader_parameter("wave_speed")
		noise = ocean_mat.get_shader_parameter("wave").noise.get_seamless_image(512, 512)
		noise_scale = ocean_mat.get_shader_parameter("noise_scale")
		wave_speed = ocean_mat.get_shader_parameter("wave_speed")
		height_scale = ocean_mat.get_shader_parameter("height_scale")

func _get_configuration_warnings():
	var warnings = []
	if get_parent() is not RigidBody3D:
		warnings.append("This node need to be a direct child of a RigidBody3D")
	return warnings