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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

iKlsR
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Andrew
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  • Maybe related - http://blender.stackexchange.com/questions/7864/black-patches-in-glass-when-using-cycles-render-engine. Also http://blender.stackexchange.com/questions/2558/how-to-illuminate-the-darkness-inside-glass-objects-in-cycles – Mr Zak Sep 26 '16 at 09:43
  • related: http://blender.stackexchange.com/questions/2823/liquid-glass-interface-ior-and-normals-in-cycles and http://blender.stackexchange.com/questions/35726/fluid-in-a-glass/35741#35741 –  Sep 26 '16 at 14:04
  • See http://adaptivesamples.com/2013/10/19/fluid-in-a-glass/ – iKlsR Sep 26 '16 at 19:08
  • Ive seen all this articles. In fact, the bottle I created as a result of the last tutorial (adaptivesamples.com). Unfortunately, it doesnt solve my problem. – Andrew Sep 27 '16 at 06:36
  • I once saw a tutorial on water in a glass (it may have been by @AndrewPrice), where it was said that the water and the container should overlap slightly, so the edge of the water should be between the outer and inner edges of the container. This avoids both Z fighting and getting pockets of air between the water and the container. –  Sep 27 '16 at 11:10
  • I'd say this result is normal. My guess: it's caused by the refraction from the bottom of the cap. – Delagone Sep 26 '16 at 14:59
  • change the ior of the glass perhaps to unrealistic high numbers – Peter Sep 27 '16 at 15:42

2 Answers2

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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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  • 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. – Andrew Sep 27 '16 at 07:06
  • @andrew Did you try making the plastic thinner? – 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

Walid
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