When using noises to create atmosphere, I find that the edges created by masking can be unsatisfactory. Real smog (of the heavy variety) has a more eventfull edge than a simple mask can readily supply. I dealt with this by merging the noise with a large ramp or blur and setting the blend mode to minus. Check out script number 3 in this linked file for an example. It is somewhat overly annotated as it was meant for teaching purposes.
http://opticalenquiry.com/nuke/documents/Noise.zip Sent from my iPad On 28 May, 2012, at 2:46 AM, Gary Jaeger <[email protected]> wrote: > Cool thanks I give those a try > > On Sat, May 26, 2012 at 11:45 AM, Fredrik Pihl <[email protected]> wrote: > 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 > > > 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 > > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > > > -- > 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
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