fabergambis
10-26-2008, 02:34 PM
As you surely know, mr4maya (or I should say Maya) doesn't still implement photometric lights as 3dsmax do, so me and other italian Maya users are trying to find out if there's any kind of connection between Maya lights units and real lights units.
Unfortunately I'm totally a noob on physics questions about lighting rules and though my efforts I cannot find out anything.
I tried to make some tests comparing my results with a 3dsmax users which is trying to help us on solving the question, but the only thing we can do is trying to get some result by empirical tests: we took a cornell box scene starting to make test with a single light (35W - 670lm) and with same render settings (FG settings, exposure, framebuffer) same light (area light with disc shape) same materials and whatsoever can have any kind of impact on rendering results.
I got the same result of 3dsmax rendering with a Maya light intensity of 2000000.000 (two millions) and I started to make calculations to explain this fact:
obviously the first is 2000000/670lm=2985.0746 but what can I do with only this information?
So I asked him to make another rendering with another light (70W - 7241lm) and same render settings except for expossure shutter speed set to 1/44 instead of 1/11 of the preceiding render; just to let you know the other exposure settings, ISO 100, f-number 8, Vignetting 0, burn_hl 0.2, crush_blacks 0.2
I got the same 3dsmax rendering look raising Maya light intensity to 10800000.000 (ten millions and eight hundred thousand): why this?
I would expect to have to raise Maya light intensity of 10,8 times instead of 5,4 times like I did.
As I stated before I'm totally a noob in scientific questions, but for what I could understand the only connection I can find is that the difference between lm is twice as much the difference between Maya light intensities.
Surely, none of the facts I exposed has nothing to do with scientific questions, but it's the only thing I can do; we should try at least with another light to see if facts match but I would like to know your opinion on this matter.
Are we only wasting time?
Are we only dreamers?
I hope someone can find the time to give an eye on this question and maybe to give an answer.
Unfortunately I'm totally a noob on physics questions about lighting rules and though my efforts I cannot find out anything.
I tried to make some tests comparing my results with a 3dsmax users which is trying to help us on solving the question, but the only thing we can do is trying to get some result by empirical tests: we took a cornell box scene starting to make test with a single light (35W - 670lm) and with same render settings (FG settings, exposure, framebuffer) same light (area light with disc shape) same materials and whatsoever can have any kind of impact on rendering results.
I got the same result of 3dsmax rendering with a Maya light intensity of 2000000.000 (two millions) and I started to make calculations to explain this fact:
obviously the first is 2000000/670lm=2985.0746 but what can I do with only this information?
So I asked him to make another rendering with another light (70W - 7241lm) and same render settings except for expossure shutter speed set to 1/44 instead of 1/11 of the preceiding render; just to let you know the other exposure settings, ISO 100, f-number 8, Vignetting 0, burn_hl 0.2, crush_blacks 0.2
I got the same 3dsmax rendering look raising Maya light intensity to 10800000.000 (ten millions and eight hundred thousand): why this?
I would expect to have to raise Maya light intensity of 10,8 times instead of 5,4 times like I did.
As I stated before I'm totally a noob in scientific questions, but for what I could understand the only connection I can find is that the difference between lm is twice as much the difference between Maya light intensities.
Surely, none of the facts I exposed has nothing to do with scientific questions, but it's the only thing I can do; we should try at least with another light to see if facts match but I would like to know your opinion on this matter.
Are we only wasting time?
Are we only dreamers?
I hope someone can find the time to give an eye on this question and maybe to give an answer.