Portal BTS Typical Elements and Entities
Introduction
In this page, you will learn what almost all rooms of the Portal's Behind the Scenes areas have in common.
Support beams
Every almost single room in the BTS areas has at least one support beam. Rooms without support beams are some sewer rooms, areas with panels, areas with the test chamber metal wall texture and off-limit areas.
Vents
Not all rooms have vents in them, although there is no limit to where you can place them.
You can learn how to create Vents here. Creating Vents
Fans
Fans have no limit to where they can be, although they aren't really used in really small areas.
You can learn how to create fans here. Creating Fans
Cables
A staple feature of most bts areas are the cables hanging from the ceiling. In Portal 1, they are made using keyframe_rope entities, with a single move_rope always being the first in a system. Be sure to get creative with adjusting the slack.
Fog
The official BTS maps have an env_fog_controller in them with the following properties:
| Property Name | Value |
|---|---|
| Fog Enable | Yes |
| Primary Fog Color | 58 82 101 |
| Secondary Fog Color | 85 43 0 |
| Fog Start | 64 |
| Fog End | 3500 |
If there are test chambers within the same map, be sure to have the fog turned off during those points.