It's just a single, unexplained setting in the Options submenu. "ON/OFF" are the only states; default is "ON."
The game makes a point of telling you that the portals do NOT affect momentum; actually, they do - if you leave funnel ON, when you come out of a portal your momentum is REALIGNED to be completely perpendicular to the plane of the exit portal. If you turn it OFF, you maintain a parabolic drop which is consistent with actual physics.
When you enter the "elevated platforms above a large pool of poison" part of 18, save your game. Try it once with the funnel ON, and then try to re-do it with it OFF.
It's. Nearly. Fucking. Impossible. And because I wasn't aware that I'd "corrected" the physics of my game with my saved options, I was doubly frustrated.
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The game makes a point of telling you that the portals do NOT affect momentum; actually, they do - if you leave funnel ON, when you come out of a portal your momentum is REALIGNED to be completely perpendicular to the plane of the exit portal. If you turn it OFF, you maintain a parabolic drop which is consistent with actual physics.
When you enter the "elevated platforms above a large pool of poison" part of 18, save your game. Try it once with the funnel ON, and then try to re-do it with it OFF.
It's. Nearly. Fucking. Impossible.
And because I wasn't aware that I'd "corrected" the physics of my game with my saved options, I was doubly frustrated.