Added descriptions

scripts/3DUI/SubViewport.gd

@@ -0,0 +1,12 @@
+extends SubViewport
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	pass # Replace with function body.
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta):
+	size = $Label3D.rect_size
+	pass