bagginsbill posted at 7:17 PM Mon, 28 June 2010 - #3664811

Now I do the math. As before, the transmission is 50% at 80 feet. But, with the correct asymptotic falloff, the transmission is 25% at 160 feet, not 0. At 250 feet (where the second sub conning tower is) the transmission is about 11.5%. At the tail of the second sub, about 360 feet away, the transmission is about 4.4%. The transmission *never* goes to 0.

Read this whole thread and it's never explained how to correct for asymptotic falloff. Has there been shared a simple node set-up just to fix the atmospheric depth cuing? 
It seems from a post at hivewire that this was shared at some point: "bagginsbill created a shader way back that swaps the linear interpolation for a more realistic depth simulation somewhere in an 'underwater submarine' thread over at Renderosity (I don't have the link at hand, but I'll track it down and post later). But you need to put the x,y,z coordinates of the current camera into one of the shader nodes - you can either do this manually (rather a pain) or automate it with a callback function that he also provided."