Birefringence

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Birefringence

Postby nuno1980 » Sat Aug 23, 2014 10:13 pm

nuno1980 Sat Aug 23, 2014 10:13 pm
Hi. :)

Birefringence has DOUBLE refractive index (double ior). Wow?! :)

Does double- and multi-ior support Octane Render?
NOTE: I'm sorry for bad english due to mute ;)

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Re: Birefringence

Postby FooZe » Mon Aug 25, 2014 12:57 am

FooZe Mon Aug 25, 2014 12:57 am
No, octane does not support this. Although I don't see why you couldn't simulate/fake something like this with a mix material with two specular materials with different IOR's.
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Re: Birefringence

Postby nuno1980 » Mon Aug 25, 2014 3:15 pm

nuno1980 Mon Aug 25, 2014 3:15 pm
Thank you. :) But looks fake because the mix material may not have polarization (birefringence material is horizontally rotating).


Should study about birefringence, if you do not know it yet - watch videos:
1st: "Double Vision - Sixty Symbols" - https://www.youtube.com/watch?v=k1oh3lXR5PE
2nd: "Demonstrating Birefringence or Birefraction" - https://www.youtube.com/watch?v=y4pknNBvEeE

screenshot with attention:
Image
Last edited by nuno1980 on Tue Mar 22, 2016 10:53 pm, edited 1 time in total.
NOTE: I'm sorry for bad english due to mute ;)

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Re: Birefringence

Postby nuno1980 » Mon Sep 01, 2014 12:12 pm

nuno1980 Mon Sep 01, 2014 12:12 pm
Is this material available in DBLive? If @FooZe/@moderator or @licensed customer answers "yes" then I'll buy OR.
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Re: Birefringence

Postby FooZe » Wed Oct 01, 2014 3:45 am

FooZe Wed Oct 01, 2014 3:45 am
Hi Nuno,

No sorry, we don't have this material. Although octane is physically based it's not a physics simulator and there are limits to it's complexity.
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Re: Birefringence

Postby nuno1980 » Wed Oct 01, 2014 8:57 pm

nuno1980 Wed Oct 01, 2014 8:57 pm
FooZe wrote:Hi Nuno,

No sorry, we don't have this material. Although octane is physically based it's not a physics simulator and there are limits to it's complexity.
Ok. I'm very interested birefringence :( because the "double" caustics would be amazing and "magic". :D

But it's possible this new material will be added in the one or more next year(s). ;)

EDIT: IMPORTANT To study about this thread - Birefringence from wiki :)
NOTE: I'm sorry for bad english due to mute ;)

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Re: Birefringence

Postby LudovicRouy » Thu Oct 02, 2014 5:20 am

LudovicRouy Thu Oct 02, 2014 5:20 am
Sorry to be negative but did you see this kind of material in your everyday life ? I think its not a "must have" in octane...
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Re: Birefringence

Postby nuno1980 » Mon Aug 17, 2015 3:09 pm

nuno1980 Mon Aug 17, 2015 3:09 pm
--> Can you render calcite material (double refraction but not fake) using new Octane Render or other program? :P
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Re: Birefringence

Postby nuno1980 » Sat Mar 05, 2016 5:02 pm

nuno1980 Sat Mar 05, 2016 5:02 pm
Hi, guys.

I tried to render the sphere with double ior and looks to seem no fake. :D
But... the blur samples seem to be multi-refraction - it's bad.

https://www.youtube.com/watch?v=4RsGtQ9BB_c --> skip to 0min11sec about double refraction - in nature. ;)

My 3 screenshots:
double ior test1.PNG

Mix material settings with 2 specular materials (only 2 different ior's). Looks wrong due to "bad" multi-refraction

double ior test2.PNG

double ior test3.PNG


How do I modify any setting to avoid blur samples?

NOTE: Unfortunately, the cobbled oblique (and cube?) still looks fake.
NOTE: I'm sorry for bad english due to mute ;)

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Re: Birefringence

Postby nuno1980 » Sun Mar 13, 2016 2:03 pm

nuno1980 Sun Mar 13, 2016 2:03 pm
If the mix material settings are correct then the blur samples (multi-refraction) are bug and PLEASE should fix this issue to newer version.
NOTE: I'm sorry for bad english due to mute ;)

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