It's a very specific question. When a fizzler is activated, it appears with a nice effect, but from what I've seen, it only works with a "trigger_portal_cleanser" object. Any idea to get this effect with a non "trigger_portal_cleanser" object?
I just want to create a new kind of field, but I cannot use a "trigger_portal_cleanser" as it doesn't allow the player to shoot portals through it.

I've 'solved' this using env_lasers which move up and down and trigger_pushs infront. You can use other triggers depending on your needs.
You can take a look at it on a YouTube video here (at 3:00min):
http://www.youtube.com/watch?v=SQK9L1AyUZU&feature=player_embedded
Hope this might help...

PS: I've to add that the chamber was broken. The solution you see wasn't the intended one

Thanks, but I want to use an animated texture, so I can't use lasers. I already created a texture similar to the fizzler that Valve made, and the fade in/out effect works fine, * but only with a "trigger_portal_cleanser"* entity. Anyway, I can still use an alpha transition system, but it's not as good as the fizzler's fading, and it seems complicated too.