Shader Problem in Kindredarts DForce "Slime and Goo" props

G315t

I get this strange ripple effects (that seem to be shadows or something like that because they move if I move the camera)  on Kindredarts DForce "Slime and Goo" props that I just purchased. 

 

Its not a preview light on Camera I checked that and its deactivated. 

 

If I change the shader (for example to basic Iray plastic) then the ripples are gone. 

 

 

Any Idea?

Ripples https://ibb.co/7C57gWQ

Plastic shader used. https://ibb.co/FnHrKbx

Richard Haseltine

What GPU and driver version do you have?

G315t

Not sure what this information will tell you, but Driver is NVidia 31.0.15.1694  Geforce RTX 2080 and CPU is Intel i7-5960X

NorthOf45

Does it look like concentric rings or bands? It seems like an interference pattern caused by the "Base Thin Film" setting. Setting it to 0.0 clears the problem, to what other effect, I can't see. Any other value brings back the banding. No other parmeters seem to affect it, other than the (Glossy) Refraction Index (not the Base Thin Film IOR). A value of 1.01 seems to clear it, but higher values bring it back again.

You could use it to some new effect, though. Increasing the "(Glossy) Refraction Index" gives tighter banding, but a darker colour, which might be of interest. Or not...

G315t

NorthOf45 said:

Does it look like concentric rings or bands? It seems like an interference pattern caused by the "Base Thin Film" setting. Setting it to 0.0 clears the problem, to what other effect, I can't see. Any other value brings back the banding.

Yes thats exactly what I observed.