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Is there any way to disable hardware occlusion culling in Portal? The reason I need to know this is that I know there is a bug in the driver for my graphics chipset (Intel 965 Family) which causes games using this feature to crash. I suspect this might be why Portal is unplayable on these cards.

Thank you. That appears to have fixed the problem (although I might just be in an area where it doesn't happen). It also increased my FPS significantly in large areas.

Click here to see it then (although it works fine for me)

Ok, so I just bought the Orange Box on Steam, and downloaded and started playing Half-Life 2. But I have an annoying glitch, where sections of floor disappear when I stand on them. In narrow corridors the walls also disappear. Screenshot: OS: Windows Vista Graphics: Mobile Intel 945 Express...