I try to render mineral water bottle filled with water in Cycles. For testing purposes I use super simple model with absolute flat lighting filled with white color.
What is bothering me are the black spots on the render. I mean, I know there should be some strange curves generated by IOR, but in the complete white environment black patches should`nt appear.
What should I do, to avoid them? I`m attaching images with the render result.
I know that lighting and model are dull, but I use them to exclude any unnecesarry factors. My render settings are:
This is my latest bottle atempt with photo lighting. It looks better, but on the top of the bottle strange curves appeared. I think that it is caused by plastic rings on the bottle, but it look unnatural. I think that I`m missing something, because I still dont have control on this render behavior.