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When assigning a material in arnold, all the normal options appear, less reflection and refraction, as I do so that these options appear?
It sounds like you think you're using Arnold 4 and the Standard shader.
With Arnold 5 and the new Standard Surface, there's no separate reflection. Just specular, which is mirror-like with roughness 0.
And refraction is now transmission.
Ok, thanks, I just installed the new version and I did not know. Thank you