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View Full Version : distance fog using IBL in mental ray?


Richard7666
07-03-2010, 10:04 AM
Anyone have any ideas? I'm using IBL and FG to light my outdoor scene, and have found this http://www.floze.org/2008/07/six-tuts-on-light-and-shade-part-vi.html tutorial, but are there any other methods that are a bit less time consuming to set up? I don't even know if I'm on the right track with that.

Or can I do it via zdepth in post? Just render out a depth pass and...any ideas what I'd do in say, Photoshop, to give a nice haze-like effect with this?

chafouin
07-03-2010, 11:11 PM
The good thing with the parti_volume is that you can get rays from your lights. If you just need haze, you can do it with a zdepth pass in any compositing software, and you will have a lot more control with really fast renders. Not sure you can do that in photoshop though, I never tried actually... Be sure you render the zdepth pass properly to have good results (I usually render it at a resolution twice bigger, without anti-aliasing, fixed sampling to 0).

Richard7666
07-04-2010, 09:24 AM
Hmm I think I'll go with doing it in post. Do you know how to do it in After Effects by any chance? hehe

chafouin
07-04-2010, 10:15 AM
http://help.adobe.com/en_US/aftereffects/cs/using/WS3878526689cb91655866c1103a9d3c597-7bd4a.html

Apparently it needs to have the depth information in the depth channel. I never used After Effects but there is certainly a way to copy channels to anothers, in case you render a RGB zdepth pass. Hope it helps.

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