Jarren said: UDL had an update a month or so ago that broke the windows ‘feature’ that was possible through API scripts. That was the same update that allowed for one-way walls. The good news is that true UDL windows (without needing an API script) are on the roadmap to be implemented. But in the meantime there’s no way to create walls that allow vision but block movement. You actually can, using the one-way walls... but it's true that we all miss the doorknocker's script functionalities. Message to the devs, hope that they'll be able to also add the block vision but not movements walls (darkness, illusory walls, wall of fire, force etc...)