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Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 1:11 am
by jfrancis
from wikipedia:
Rayleigh scattering in opalescent glass: it appears blue from the side, but orange light shines through.
https://en.wikipedia.org/wiki/Rayleigh_scattering
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 10:44 am
by m-Que
Like so?
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 11:28 am
by eric nixon
Francis the Tyndall effect isnt possible.. I tried once to get that effect... nada.
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 1:55 pm
by tom
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 2:50 pm
by mashium123
sorry to be off-topic, but i feel the need to express my disappointment about being excluded from potentially valuable content because of my decision not to be part of an other company's product and/or it's target group.
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 3:30 pm
by choo-chee
Why do I have to like stuff on phasebuk, can't I just see it ? I'm a customer ya know....
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 3:34 pm
by polynurb
mashium123 wrote:
sorry to be off-topic, but i feel the need to express my disappointment about being excluded from potentially valuable content because of my decision not to be part of an other company's product and/or it's target group.
+1
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 3:37 pm
by numerobis
mashium123 wrote:
sorry to be off-topic, but i feel the need to express my disappointment about being excluded from potentially valuable content because of my decision not to be part of an other company's product and/or it's target group.
+1
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 3:42 pm
by Half Life
mashium123 wrote:sorry to be off-topic, but i feel the need to express my disappointment about being excluded from potentially valuable content because of my decision not to be part of an other company's product and/or it's target group.
+1
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 4:24 pm
by Half Life
In the meantime
here's a simple MXM material to illustrate the effect (you'll have to adjust the scattering coef for size of your object) -- I have no idea how Tom's MXM might differ so if we non-facebook users can see it that would be cool.
Best,
Jason.
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 5:07 pm
by EADC
It's pretty identical. scattering 200 instead of 25, attenuation 6mm, nd of 1.4 and no roughness. Scattering color 58,149,234
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 5:18 pm
by EADC
left is Tom's, right is Jason's. Adjusted Jason's coeff, roughness and nd
just for fun i changed the scattering color to orange, the caustics turns pale bleu. So it seems all that happens is that the colors invert.
more fun
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 5:40 pm
by jfrancis
Awesome
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 6:01 pm
by Bubbaloo
Amazing!
Re: Does Maxwell SSS model Rayleigh Scattering?
Posted: Wed Apr 24, 2013 7:34 pm
by eric nixon
Hi Tom, same result I saw also.... but in the picture the stone isnt cloudy like that.... its a much clearer blue transmission with a slight orange fog. (its shown against a white background which makes it look milky, but the blue element is actually clear,... with imperfections ofcourse.)
If you try and mix bsdfs to get both effects the mxm will just be a green muddy mess... (I tried once)
