a bit of restructuring, renaming, and c sharp setup

scripts/GdScript/player_3d.gd

@@ -0,0 +1,30 @@
+extends CharacterBody3D
+
+
+@export var SPEED = 1.0
+
+@onready var camera_3d: Camera3D = $CameraPivot/SubPivot/Camera3D
+
+
+func _physics_process(delta: float) -> void:
+	# Add the gravity.
+	if not is_on_floor():
+		velocity += Vector3.DOWN * delta
+
+	# Handle jump.
+	#if Input.is_action_just_pressed("ui_accept") and is_on_floor():
+	#	velocity.y = JUMP_VELOCITY
+
+	# Get the input direction and handle the movement/deceleration.
+	# As good practice, you should replace UI actions with custom gameplay actions.
+	var input_dir := Input.get_vector("move_left", "move_right", "move_up", "move_down")
+	input_dir = input_dir.rotated(-camera_3d.global_rotation.y)
+	var direction := (transform.basis * Vector3(input_dir.x, 0, input_dir.y)).normalized()
+	if direction:
+		velocity.x = direction.x * SPEED
+		velocity.z = direction.z * SPEED
+	else:
+		velocity.x = move_toward(velocity.x, 0, SPEED)
+		velocity.z = move_toward(velocity.z, 0, SPEED)
+
+	move_and_slide()