Gary, I usually over a constant color (w alpha) ranging from blue to white/gray, depending on the type of weather and time of day in the plate, modulated by depth. This is the scattering of light that occurs by particles (water vapour, dust etc) in the air between the observer and the distant object. When the particles are very tiny this scattering is highly wavelength dependant - blue light is scattered far more then red light (thats why the sky is blue). Bigger particles like water droplets are not and scatter all wavelengths pretty much the same - hence - clouds and mist come out white.
The distant object also loses light due to the same scattering.. losing the blue wavelengths first.. so I usually multiply with yellow thru red modulated by the same depth. The more air and particles there is between the object and the observer the more of the short wavelengths are scattered and absorbed. Thats why sunsets are so beautiful :) refer http://hyperphysics.phy-astr.gsu.edu/hbase/atmos/blusky.html To just plainly desat and grade usually works - but this approach is more accurate to nature, and just as simple. I once comped a cg smoke element on a plate with a bright sky and sun, letting the density of the smoke affect the color of the bg.. not really noticeable ,except when the thick smoke passed in front of the sun disk where it going redder came out beautifully realistic :) /fredd On Sat, May 26, 2012 at 2:01 AM, Darren Coombes < [email protected]> wrote: > Sometimes I use the noise node, using depth pass as mask. > > Helps if the noise is larger than smaller i reckon. > > then just grade the noise if need be, and comp over footage. > > Cheers. > > Darren. > > On 26/05/2012, at 9:16 AM, Gary Jaeger wrote: > > anybody have any good recipes for adding atmosphere, probably using a > depth matte I'd guess? is it mostly a contrast thing? > > -- > Gary Jaeger // Core Studio > 249 Princeton Avenue > Half Moon Bay, CA 94019 > 650 728 7060 > http://corestudio.com > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > > *Darren Coombes* > *Compositor* > > *www.resolutiondesign.com.au* <http://www.resolutiondesign.com.au/> > > > *resolution: sydney australia* tel: *+61 2 9360 9908* fax: > +*61 2 9360 8908* > *22* burton st: east sydney: *2010* post office box: *614* > darlinghurst: 1300* *abn: *3305 196 1856* > > *2010 Silver One Show Entertainment Award: Online Branded Entertainment * > *2009 Gold Promax/BDA Award: Best Broadcast Design Image Spot * > *2009 Winner Creative Review Hotshop Award: Post Production / VFX* > *2009 Finalist Creative Review Hotshop Award: Broadcast Design* > > > The information transmitted, together with the attachments, is intended > only for the person or entity to which it is addressed and may contain > confidential and/or priviliged material which may be subject to copyright. > Any review, retransmission or other use of, or taking of any action in > reliance upon, this information by persons or entities other than the > intended recipient is prohibited. If you received this in error, please > contact the sender and delete the material from any computer or network. No > warranty is given by the sender that any attachments to this email are free > from viruses or other defects. > > > > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > -- __________________________________________________ *Fredrik Pihl - **visual effects supervisor - digital compositor* *UNITED IMAGE CREATORS AB* rönnvägen 11, se-14144 huddinge, sweden +46-708-559 559
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