Hi guys.
I just finished my lessons about Indigo-SkIndigo, and in one of the final tests one thing ame up.
I couldn't explain why, so here I am with my question.
The exact same scene was given to all the students, I report here a comparison between two results to show the difference and point out the question.
Like I said, the base scene is the same (during the lessons we modeled a detailed Barcelona Pavillion), exceptede a little variation for the water plane, which was randomly created with a SU plugin.
The first render was computed on a:
core2duo T5800 2GHz ram 2GB
and reached 312 s/px before the desired halt time (30mins)
The second render was computed on a quite older:
pentium centrino 2GHz ram 1GB
and reached 365 s/px in the same amount of time!
This sounded a little weird, if I might say. I couldn' explain why a slower processor could reach a higher SPP value. I've always thought to the SPP value as an objective parameter to determine the quality of renders in terms of noise: an image with 15000 s/px is more noise-free if compared to a 4000 s/px.
I know that sometimes different mats and geometry can make the real difference, but in this case the scene was exactly the same: same model, same scene setup, same materials (all diffuse), same lights, same environment...
Another strange thing is that the same scene looks more noise-free in the image with less s/px.
Can someone explain why this happens?
Thank you a lot!
understanding SPP
Re: understanding SPP
Maybe the faster cpu rendered on 1 core.
Or 1 core was under some nasty program like nero scout (if not disabled).
Or 1 core was under some nasty program like nero scout (if not disabled).
Re: understanding SPP
Checked while running.
No strange or leech programs running in the background, and the faster notebook was actually using the 2 cores, while the centrino the only core it has..
No strange or leech programs running in the background, and the faster notebook was actually using the 2 cores, while the centrino the only core it has..
Re: understanding SPP
I did not encounter this when I did the renders for the GH house archviz challenge. (Or I may not have noticed it) I used a core2quad @2.3 ghz w/ 3gb ram and a core2duo @2.0 w/ 1gb ram to render several images which I merged later. Renders on the core2duo took twice as long to finish as those from the core2quad. I set the rendering to stop at 2000spp.
Re: understanding SPP
Can it be virus, or the cpu really is faster than the dual core, cant find benchmarks of centrino product line.
There are new Centrino 2 cpu's http://www.intel.com/products/centrino/
If possible, run another test with some benchmark
http://www.passmark.com/products/pt.htm
Or simple file compression benchmark, multi photo batch processing benchmark.
There are new Centrino 2 cpu's http://www.intel.com/products/centrino/
If possible, run another test with some benchmark
http://www.passmark.com/products/pt.htm
Or simple file compression benchmark, multi photo batch processing benchmark.
Re: understanding SPP
The noiser scene seems to have a surface leak for the water, light might enter there and bounce below the water surface a lot (for no visible result but ressources waste).
Even if it's not a geometry leak, it's a detail to dig.
edit: make sure that both scenes use the same mesh and displacement settings for the water surface.
Even if it's not a geometry leak, it's a detail to dig.
edit: make sure that both scenes use the same mesh and displacement settings for the water surface.
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