You can use a func brush and toggle it on/off
or make the stairs a door and raise it from the floor at a high speed.

If its a model it must also be possible to toggle a model since thats what 
they do in TF2 to open/close a section in maps like dustbowl.
(could be a TF2 only feature tough)

Thats how I would go for it, since switching the texture does not effect the 
collision of the object and I asume the stairs would be usable by the 
player.
But there should also be ways to replace a texture, for example: the 
connections to a button in portal are 2 seperate textures that are toggled.



----- Original Message ----- 
From: "Peter Enerccio" <enerc...@gmail.com>
To: <hlmappers@list.valvesoftware.com>
Sent: Saturday, June 05, 2010 9:53 PM
Subject: [hlmappers] Changing textures on the run


> Is it possible to change texture of a brush during the gameplay?
>
> I would like to have an appearing staircase on my map, that should
> appear out of nowhere. I don't know the best way to do it. The
> staircase will be huge, so using train would be impractical I think.
>
> Thanks a bunch, Ener
>
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