I want to create a scene similar to this in a HL1 map: It should give the player the feeling of being underwater, but functionally shouldn't affect the movement or weapons.
To be clear, I don't want to make the player swim, I want to simulate the visual effect of being underwater while still retaining normal outside-of-water physics.
Visual power of suggestion is key here, i.e. adding underwater plants and some env_bubbles here and there and also simulating the water surface with a layer of transparent func_water at the top. All that is not a big issue.
But I'm having trouble simulating the the overall blue-ish tone and the limited depth of field / foggy effect that gradually limits your view on objects further away when you're in water.
Does anyone have an idea of how I could possibly achieve something like this?