Fog Control

Is there a way to keep fog to a certain level, like only up to your knees,or hovering above a swamp area only?

yes, but it's not gonna look like the fog simulated by the env_fog entity.

Here's a list and explanation about all the entities in Source that let you implement and control fog, dust and smoke in Source: http://developer.valvesoftware.com/wiki/Dust

Also if you're working in the Orange Box, you'll have access to the info_particle_system which lets you emit custom made particles. So, if you're looking for your own effects, that would be the way to go, but you'll need to learn a new tool to get what you want. However, those other entities list should help get you what you want.

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Blog: www.playingarchitecture.net
LinkedIn: Eric Lancon
Twitter:@Riven202

Can it be done with an animated brush?

Also to note the volumetric fog is more expensive than the global fog (env_fog) but the volumetric fog looks nicer.

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Aaron's Stuff