build preview update

Scripts/global_script.gd

@@ -1,17 +1,25 @@
 extends Node3D
 @export var debugLabel1: Label
-
+@onready var build_material = load("res://Shaders/build_transparent.gdshader")
 
 signal exit_build_mode
+signal enter_build_mode
+
+signal preview_created
+signal preview_destroyed
 
 var build_mode: bool = false
 
 
+func _ready() -> void:
+	build_material.set("alpha", 0.5)
+
 func _input(event: InputEvent) -> void:
 	if event.is_action_released("enter_build_mode"):
 		if build_mode:
 			exit_build_mode.emit()
 			build_mode = false
 		else:
+			enter_build_mode.emit()
 			build_mode = true