FALLOFF - Circles Error

[Neticon]

I'm Andrea, from Milan. I've a problem when I use the falloff node: I have to create a mix material for special sunglasses lenses that change color depending on your point of view:


The material I've created was this (2xGlossy/falloff):


but this was the result when I applied it on the lens:


Why are there those concentric circles? How can I solve it? I tried also with 16000 samples, but the result doesn't change.
The centre of the circle isn't a light point (I use a daylight environment) and this effect remains also if I delete the two panels in front of the lens. Could someone help me?

My Pc has two Titan GeForce Black Edition

Thank you,

Andrea

[gordonrobb]

What's your geometry like? Is it smoothing errors maybe?

[whersmy]

Try turning down the rayepsilon value!

[Neticon]

I tried to change epsilon value, but nothing changes!
Could it be a geometry problem, also if the lens is "only" a trimmed sphere?!?!
I tought that a sphere was a simple mesh

Thank you

[whersmy]

You can also, if not already done, try ticking "smooth" in the material settings?

[Neticon]

I tried also activating smooth option, but the circles remain!
Applying the same material to a not-scaled sphere, there are the same problems, but applying it to a different part of the sunglasses the circles disappear.
Which software do you use for 3d modeling? This geometry was made with Alias Design by Autodesk, but maybe I exported the obj in a wrong way.

[Seekerfinder]

Hey Andrea,
Do you have a specular material in your mix? I am no materials buff but I have seen similar banding in specular materials. Have you tried playing with different indexes of refraction?

Seeker

[kavorka]

Do they remain the same if you up the resolution of your render?

[roeland]

What version of Octane are you using? We had a problem like this in the old Octane versions prior to 1.50 but it has been fixed.

--
Roeland

[Neticon]

Thank you for your answers.

- Seekerfinder: I mixed two glossy materials which have an RGBspectrum mapped on "specular" and "duffuse" (the reflection of the lenses isn't white)

- kavorka: my resolution is 3000x1500 and also if I pump up the samples the circles remains and they're more defined

- roeland: I use Octane 1.20 instead 1.53 because if I tick the matte option for light panels' material (blackbody emission), their reflection and light effects disappear!! This is my worst problem!! I also had to remake all environment/lights/materials when I updated Octane and opened the same file (saved in 1.2)