OTOY Forums

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

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

Try turning down the rayepsilon value!

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

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

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.

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

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

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

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)