Speculation with portals
Well yeah have it at an angle. I still feel as if the beam would keep going until an object got in the way. I kinda based this on SuperPosition. I don't know a lot about physics so, I guess my first reasoning of the situation was the correct one.
portal inside portal solution!
so you will feel opposite force and you can't do that!
The device has been modified,so you has been PWNED!
WTF? A portal shooting out through itself? Oh my aching head...
As for the whole "portal-into-a-portal" thing... If you enable sv_cheats and sv_portal_placement_never_fail, then shoot two portals at the EXACT SAME SPOT on a surface, it looks like one portal that has a mirrorlike surface. You can walk right through it, and you even have Ghost Collision (to use a ProjectFUN term) with yourself. If it was possible for a solid object to have Ghost Collision with itself in the real world, then you can have a mirrored portal event like this. It also makes it seem like one Companion Cube has become two 
Seeing Chell and the Portal-Clone Chell inside each other is best seen if thirdperson is enabled.
Laser going infinitely through a portal: I saw a YouTube video about the Portal Playground map (which I can't seem to get it to work... Could someone tell me where to find a .bmz version of the map plx?), where the player had two portals on opposite walls, directly in front of the Rocket Turret, and if it was at exactly the right location, you see multiple targeting lasers shooting across the room. Then the Rocket Turret fires, the rocket goes through the same portals multiple times, and it eventually hits itself with its own missile XD
It is possible to slice yourself in half with a portal. Usually, the game teleports you out of whichever portal end you're less into, but if your midpoint is at the exact level of the event horizon (where you're officially "inside" the portal), and you shoot one portal somewhere else, you get killed. This has only happened once, and to do it, you have to do it at the part of the facility where you stick your head through a portal to get on top of a crusher. I wonder what would happen if you spawned a Storage Cube in the portal, then fired another portal elsewhere? Would the cube do like what happens with a fizzler?
When you shoot a portal at an object, such as a cube or a camera, it doesn't hit the object. It goes through it onto the surface behind or underneath it, causing the camera to crash and burn, and the cube to fall into the incinerator.
*fifty cakes fall out*
Time out for a second. That wasn't supposed to happen.
no that was if you shoot portal on wall another portal on wall and grab wall (with portal) and insert it into one portal...
The device has been modified,so you has been PWNED!
Okay...
Well, since the game removes any portals on an object that starts moving (like the platforms in the Portal TFV mappack), the only way to make the object move the portals into each other without destroying the moving portal is to stretch space like a rubber band. Local space-time around both portals would be normal (or at least what IS normal space-time for a portal ), while the physical distance between the portals would decrease.
Of course, warping space-time like this within close proximity to a portal might asplode the universe, like trying to open two wormholes near each other, or opening a wormhole from within a black hole.
Okay, none of that made any sense whatsoever. Maybe I should try reading some of Stephen Hawking's books before trying to explain this type of thing again... Anyone know where I can get a copy of "More Things You'll Never Understand"?
*fifty cakes fall out*
Time out for a second. That wasn't supposed to happen.
Isn't it great how everyone reads the first post before commenting?
Do you have any idea how old or long this thread is? I haven't even read all of it.
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blasphemy.
yeah but who the fuck has THAT kind of time.
but i think what he meant is the FIRST post, in that they say if portals could be used in the real world. NOT following the "hl2.exe" version rules
Yeah i meant just the first post, which kicks off the discussion.
It helps to know what the thread is supposed to be about instead of reading the last post which could be horribly off topic.
rellikpd hit the nail on the head.
The irony here is crushing.