Portal 1 BTS

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Portal 1 does not have many themes , there is only normal test chambers and bts. Portal 2 on the other hand , has many themes. This article will talk about how to make bts in portal 1.

Noticable Elements

In many maps with this style there are catwalks , vactubes , wall pipes , deceptive skyboxes , and more .

Textures

The textures for this are very simple style , for metal walls ceiling add metal/metalwall_bts_006a foor metal floor add metal/metalfloor_bts_001a or metal/metalfloor_bts_001b. For concrete walls add concrete/concrete_bts_modular_wall001a , concrete/concrete_bts_modular_wall001b , concrete/concrete_bts_modular_wall001c , and concrete/concrete_bts_modular_wall001d. For a concrete ceiling add concrete/concrete_bts_ceiling002a and for the floor add concrete/concrete_bts_floor002a.

Note:you can spice up walls with cut walls with models/props_wasteland/interior_fence static models and behind them vactubes and orange lights/gradients.

Catwalks

To create flat catwalks , first make the frame for it by using the texture metal/metalbeam_bts_001a in a 4 x 4 x 4 brush. Next , fill it in with either metal/metalfloor_bts_001b or metal/metalstair004b. with the height as 1.

To create stair catwalks make a frame with the texture metal/metalbeam_bts_001a with a 4 x 4 x 4 brush , then rotate it 45 deg. Finally , make grated stairs with 1 height and 16 length across all your frame with the texture metal/metalstair004a.