Birefringence

[nuno1980]

Hi.

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

Does double- and multi-ior support Octane Render?

[FooZe]

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.

[nuno1980]

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:

[nuno1980]

Is this material available in DBLive? If @FooZe/@moderator or @licensed customer answers "yes" then I'll buy OR.

[FooZe]

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.

[nuno1980]

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".

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

[LudovicRouy]

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...

[nuno1980]

--> Can you render calcite material (double refraction but not fake) using new Octane Render or other program?

[nuno1980]

Hi, guys.

I tried to render the sphere with double ior and looks to seem no fake.
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:

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

How do I modify any setting to avoid blur samples?

NOTE: Unfortunately, the cobbled oblique (and cube?) still looks fake.

[nuno1980]

If the mix material settings are correct then the blur samples (multi-refraction) are bug and PLEASE should fix this issue to newer version.