Tilt the camera left and right in Half-Life 2 Beta

[redguard]

Hello comrades! How do I enable the left and right tilt function in beta? She is in Quake, Half-Life 1 and in the video with the elite sniper Combine. I've been using this feature for a long time and it's in Half-Life 2 Beta, but I forgot how to activate it. Can you help?

&t=7s

[syf2010]

simply start your map as a server

[redguard]

simply start your map as a server

it helped. Thanks