invisible solid surfices!
Is there some way to make an invisible surface solid, lika a vphysics or something, and make it impassible for portals as well?
Yes. It's called the invisible texture.
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But then portals can pass through it
I'm not sure if this will work for portal shots, but try the block bullets texture.
Try a player clip
SOLVED!
I have had this problem before. The ONLY way this will work is to make a func_brush, texture it with like a metal wall or something unportable, then set the RenderMode in properties to 'Dont Render'. Easy.
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"Oh, in case you got covered in that repulsion gel, here's some advice the lab boys gave me: DO NOT get covered in the repulsion gel."
Sure this is the only way? What about the nodraw texture?
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Yes, that would work fine, but you do have to make a func_brush out of it, otherwise it will be a solid (visibility blocking) wall, and things behind it may become invisible.
And make sure you use the no-portal version of nodraw, otherwise you'll have portals mysteriously suspended in mid-air, which is absolutely terrifying!
(But obviously not paranormal in any meaningful way.)
Other Portal 2 maps: Medusa Glare
Portal 1 maps: Try Anything Twice | Manic Mechanic