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I've been playing with the new Vray atmospherics and been having a lot of fun 
They take forever to render and requires some pretty advanced Vray knowledge to make them clean and fast enough for production but we've managed to get each frame down to under 60 min at 720p, so that's not too shabby :/
Good thing we have a render farm!
I'm rendering the atmospherics as a separate pass due to some sampling issues and it gives me the ability to control the atmospherics levels in post:
THOMAS SHANNON
SENIOR DESIGN VISUALIZATION SPECIALIST
PB Project Visualization
http://www.pbprojectviz.com/
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Yeah SP3 adds physically correct atmospherics, but like most of Vray's advanced features it's a bit daunting to get right.
THOMAS SHANNON
SENIOR DESIGN VISUALIZATION SPECIALIST
PB Project Visualization
http://www.pbprojectviz.com/
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| Here's an HD render (lovingly downsized by the board) 
Here's some stats: - 200+ Vray IES Lights
- Brute Force GI lit by the HDRI
- 49+ Million triangles
- 4500 Trees (24 unique Vray Proxy objects)
- Rendered to EXR and composited in After Effects using a few plugins (RE Motion Blur and Star Glow)
This is really a proof of concept and we're hoping our client will give us the go ahead to do an animation with all the bells and whistles soon
THOMAS SHANNON
SENIOR DESIGN VISUALIZATION SPECIALIST
PB Project Visualization
http://www.pbprojectviz.com/
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Claudio Branch (5/20/2009)
60 minutes per frame is still pretty high...how many nodes do you have at your disposal?er quite a few... I'm not sure I can say exacly how many, but 60 min a frame is okay for us  (As long as the animation isn't too long or the client too picky)
THOMAS SHANNON
SENIOR DESIGN VISUALIZATION SPECIALIST
PB Project Visualization
http://www.pbprojectviz.com/
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"old dog"
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Claudio Branch (5/20/2009)
BF is probably the culprit...I use IR+LCThe RGB pass takes about 10 min to render (using BF GI, etc), the atmospherics don't have any GI/maps, etc (Everything is a dark gray override, all materials removed and set to matte objects) and they take 60 min
I used to use Irmaps and all that stuff, but I've moved past that now
http://gnomonology.com/tutorial/62
After watching that, I've dug really deep into the sampling system in Vray and I can get full brute-force GI in about the same frame time as a traditional render without all the problems with Irmaps and other biased approaches (animation, botches, leaks, pre-passes (blech!))
It's pretty heady stuff and your frame times at first seem higher than regular methods, but you end up with perfect glossy effects, no noise and no need to pre-pass or run separate passes for your animated objects. We've also discovered that it handles MASSIVE numbers of lights without much of a performance hit.
Here's the plate and atmo pass with some overexposure so you can see all the details: 
THOMAS SHANNON
SENIOR DESIGN VISUALIZATION SPECIALIST
PB Project Visualization
http://www.pbprojectviz.com/
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"old dog"
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| Yeah, you can avoid all pre calc that way and the render 'hit' from using BF for both is pretty small. I actually tend not to use a second bounce in exterior daylight renders as I feel it isn't contrasty enough. Glen's right, the ability to preview is super sweet. The other great thing is that you never have to set the Subdivisions settings in your glossy effects (material reflecton/refractions, shadows, etc.) as that's all handled by the sampler. (You actually set the global multipliers to 0.0) 
If anybody wants a copy of this scene, just email or PM me and I'll send it off!
THOMAS SHANNON
SENIOR DESIGN VISUALIZATION SPECIALIST
PB Project Visualization
http://www.pbprojectviz.com/
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"old dog"
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