Portal BTS - Tutorial - Air Ducts
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This page will show you how to create ducts.
These ducts can be seen in Rat Man dens and in escape_01 right before entering the Fan.
64w*64h hole in your wall. Make sure your hole is at least 64 units long and interior face textures to
Create your path, areas should be 64w*64h.
16w*64l*16h brushes with the
16w*16l*64h brushes with the
Use the Clipping Tool to create a 45 degree slope for every brush.
Align the textures. You can have half of the vent texture cut off. You can also set the Texture Scale X value to
0.1875 if necessary.
You'll need to align the vent edge textures to the path's textures. Make sure the slopes of the vent edges have the edge of the texture in between the slope and the interior face.
Add Vents as they are a useful light source.