Fixed flicker

ui/component/DialogueChoiceBox.gd

@@ -32,6 +32,7 @@ func setup(responses:Array[DialogueResponse], entity:Entity) -> void:
     _list.add_child(label)
 
   size.x = MAX_WIDTH
+  modulate.a = 0.0
   visible = true
   _updateSelection()
 
@@ -79,9 +80,18 @@ func _updateWorldPosition() -> void:
   var camera:Camera3D = get_viewport().get_camera_3d()
   if camera == null:
     return
+  if size.y == 0:
+    return
   var worldPos:Vector3 = _entity.global_position + Vector3(0, 2.5, 0)
+  if camera.is_position_behind(worldPos):
+    modulate.a = 0.0
+    return
+  modulate.a = 1.0
   var screenPos:Vector2 = camera.unproject_position(worldPos)
   var viewportSize:Vector2 = get_viewport().get_visible_rect().size
-  position = screenPos - Vector2(size.x * 0.5, size.y)
-  position.x = clamp(position.x, 0.0, viewportSize.x - size.x)
-  position.y = clamp(position.y, 0.0, viewportSize.y - size.y)
+  position.x = clamp(screenPos.x - size.x * 0.5, 0.0, viewportSize.x - size.x)
+  var yAbove:float = screenPos.y - size.y
+  if yAbove >= 0.0:
+    position.y = yAbove
+  else:
+    position.y = clamp(screenPos.y + 10.0, 0.0, viewportSize.y - size.y)