new method of creating preview

Scripts/build_object.gd

@@ -2,36 +2,47 @@ extends Node3D
 
 
 @export var meshInstance: MeshInstance3D
-@export var greenMeshInstance: MeshInstance3D
-@export var RedMeshInstance: MeshInstance3D
+@export var preview_shader: ShaderMaterial
 
+var default_shaders: Array
 
 func _ready() -> void:
 	Global.preview_created.connect(_on_preview_create)
 	Global.object_placed.connect(_on_object_placed)
+	set_default_shaders()
 
 
+func set_default_shaders():
+	var amount_shaders = meshInstance.get_surface_override_material_count()
+	default_shaders.resize( amount_shaders)
+	
+	for i in amount_shaders:
+		default_shaders[i] = meshInstance.get_surface_override_material(i)
+
+func restore_default_shaders():
+	for i in meshInstance.get_surface_override_material_count():
+		meshInstance.set_surface_override_material(i,default_shaders[i])
+	pass
+
+func set_preview_shader_color():
+	if true:
+		set_green_color()
+	for i in meshInstance.get_surface_override_material_count():
+		meshInstance.set_surface_override_material(i,preview_shader)
+	pass
+
 func set_green_color():
-	hide_mainMesh()
-	greenMeshInstance.visible = true
+	preview_shader.set_shader_parameter("color", Vector3(0,1.0,0))
 	
 func set_red_color():
-	hide_mainMesh()
-	RedMeshInstance.visible = true
+	preview_shader.set_shader_parameter("color", Vector3(1.0,0,0))
+	pass
 
-func hide_mainMesh():
-	meshInstance.visible = false
 
-func show_mainMesh():
-	meshInstance.visible = true
-	greenMeshInstance.visible = false
-	RedMeshInstance.visible = false
 
 func _on_preview_create():
-	set_green_color()
+	set_preview_shader_color()
 
 
 func _on_object_placed():
-	show_mainMesh()
-	greenMeshInstance.queue_free()
-	RedMeshInstance.queue_free()
+	restore_default_shaders()