Portal
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Portal Glitch Fix
By robinjk9
Type "-dxlevel 95" into the launch options for the game.
 
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How to fix the portal glitch:
If your portals look like this, then this this simple trick should fix those portals.
Go to your steam library and find Portal. Right click on the game and select properties. In the properties menu, select Set Launch Options. In the new window, type in this:

-dxlevel 95

This sets up the game to use DirectX 9 instead of 8 and your portals should look beautiful again.
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3 Comments
The Man Aug 13, 2017 @ 5:56pm 
same here, doesnt work
HotWater250 Jul 11, 2016 @ 2:37am 
It doesn't seem to work for me.
BrandenKILLZ Jul 5, 2016 @ 6:04pm 
thx! this really works and i dont have to install anything!