Discouragement Beam

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Thermal discouragement beams are a game mechanic in Portal 2 which can be thought of as lasers. A typical thermal discouragement beam puzzle in portal involves redirecting a laser into a socket using portals, redirection cubes, or a combination of the two. When the player touches a laser in Portal 2, they receive a small amount of damage and are pushed away from the beam (that is, they are thermally discouraged). If the player continues to run into the beam they will eventually die. Turrets die almost as soon as the laser touches them.

Creating a Thermal Discouragement Beam

The two most imporant elements of any laser setup are env_portal_laser and prop_laser_catcher, which create and "catch" the laser, respectively. Two optional elements are the prop_weighted_cube with CubeType set to 2 (redirection cube) and the prop_laser_relay.