CGTalk - Simulating atmosphere and depth

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Kinten

07-19-2007, 03:51 PM

As you all know, atmosphere and distance creates the illusion that things further away have less color depth, particularly visible in landscape scenes (see picture below). Now I want to simulate this effect in a scene of mine, without using fog or changing the textures.

Any ideas how I can achieve this effect using max and vray?

I'm thankful for any help I can get!

Cheers!

http://img2.travelblog.org/Photos/10474/55398/f/313989-Peruvian-landscape-0.jpg
Image courtesy of Travel Blog

Seraph135

07-19-2007, 10:17 PM

Fog would be the easiest way. Why don't you want to use fog?

You could also do it with a distance blend falloff map...But you would have to set up two diffuse maps for every material in the scene.

Its easy to do if your able to composite in post. You can either render a fog pass and use it as a mask on a color correction. Or you can render a Z-depth channel and use that the same way.

Tim J

Delucubus

07-20-2007, 01:11 AM

Ya, with out fog, I'd say a good way to go would be to render out a depth matte and use it to control your brightness/contrast.

Kinten

07-24-2007, 10:25 PM

Thanks for answering!

I'm doing a short animation and fog is probably the most effective way. I was hoping to shorten render time though, but after some optimizations it turns out I've got bigger problems :)

axl77

07-25-2007, 07:58 AM

you can make it in post with the z-depht using like mask in AE or similar. don't use vrayzdepht but make it with scanline

playmesumch00ns

07-25-2007, 08:48 AM

Fog shouldn't add anything noticeable to your render times as long as you're not trying to do volumetric shadows or anything

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07-25-2007, 08:48 AM

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