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!
