Hello, guys.

More issue: (normal) Extraordinary IOR delta's values between -0.100 and +0.100 cause disappear the extraordinary refraction as bug.
EDIT: Film extraordinary IOR between same numbers cause disappear the interference.

Best regards.

I see, well, while dispersion has been supported in Octane for a while in some materials, diffraction has not been - until now with the Physical Optics material - which has not got support for retro-reflectivity.
So, there isn't a material in Octane that supports both at the moment. We could look ...

@arnon.marcus: Yeah. Not dispersion, sorry. But yes diffraction in retro-reflectivity? Because I detected the diffraction in retro-reflectivity of blue traffic sign at highway from our sunlight source.

Hello, guys. :)

ISSUE: horizontally rotating extraordinary ray is incorrect while obique rectangular prism material is horizontally rotating (on "Placement" node only).
--> Watch https://youtu.be/cwCIvoWT-0Y and then to 1:37 (look duration bar of youtube) - in real life

birefringence test ...

CaCO3 (Calcium carbonate, Calcite) material at wavelength of 589.3 nm - see -> https://refractiveindex.info/?shelf=main&book=CaCO3&page=Ghosh-o:
-- ordinary ray:
- ior(o)_D: 1.6583
- V(o)_D: 49.87

-- extraordinary ray:
- ior(e)_D: 1.4861
- V(e)_D : 78.4 - But this isn't in this OR version. :roll ...

But... new Physical Optics material, birefringence doesn't have any extraordinary dispersion!? False.

Amazing 2 features: "Physical optics material and "Retro-reflectivity support"!!

Does Retro-reflectivity have the "dispersion" (in thin- or micro-refraction) option?

But I'll be testing...

Will you be paying the original artist?
https://render.otoy.com/forum/viewtopic.php?t=85477
Good day. I'll pay this!? No because you have said "free" Blender project. But I export your scene to ORBX and I've modified to correct various materials for the real world and to add a "texture ...

Hello, guys. :)

---> IMPORTANT: before your buy, check my new signature (bottom of my any message) for learn my learning/tips. ;)

-- NOTE: I suspend to upload any new project (ORBX, Blender or...) until 11th rendered image sold because I sold only 1st rendered image until the moment ...

Hello, guys. :)

New image - OR vs GIMP, with the showed number of spp for region (not full image) on GIMP (not OR)
3 zooms - OR vs GIMP.png


-> Please, should correct bad colors (poorer, weaker and darker) noises issue for 50% zoom and fix bad antialising issue for lower than 25% zoom in next ...