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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.

Watter in the bottle

I know that lighting and model are dull, but I use them to exclude any unnecesarry factors. My render settings are:

render settings


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.

latest result

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These "black spots" are actualy supposed to be there. enter image description here

Look at these images with similar dark spots

enter image description here

It is actually more prevalent in thicker objects so if you really don't like it, try making the glass thinner sadf This images has a glass with much thicker walls.

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  • $\begingroup$ You`re right. I just have impression that this black holes should be much lighter. The photos, that you are showing are made in photo studio with black areas (just assuming), but in the complete white environment there should not be any black patches. $\endgroup$ – Andrew Sep 27 '16 at 7:06
  • $\begingroup$ @andrew Did you try making the plastic thinner? $\endgroup$ – 10 Replies Sep 27 '16 at 10:14
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Check the hdri lighting with this seen !

Hope this will work for you ! check it ![enter image description here]1

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