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Hello friends.



I want to know why my cocktail has this section.

Here is my scene setup and I used hdr fo environment.



Sincerly,

JH

Perhaps the ground or backdrop aren't big enough. Try removing one or the other to find out which one causes that reflection, then increase it's size.

Hi, Mihai

In my image I used multilight, so I turned it off one by one.




First is the one which turned on just front and left emitter and increased intensity to see the reflection of them.

Second is just turned top emitter on with maximum intensity

and the last is just turned on envirionment emitter with hdr refleciton.

just guessing, but what you actually seeing can't be a weird reflection of the glass base?

simple test.

I dont' know what is the best studio to reflection with hdr.

it's a just simple reflection test.

I used just physical sky and sunlight and no emitter, no environment channel.

What's your HDR look like?

In my cocktail image, I used this one for reflection




but I didn't use any hdr for the test.


and here is just one cone object and no other bg and no emitter

just physical sky + sun with default setting.



Is this a correct? If it is, how about my image?

With your first images, it looks to me like the lower portion of the water is intersecting with the glass, and the upper is not (or the other way around).

Hi, michael.

When I render it without glass, the result was the same.

Have you checked the answer of jdp, i think he could be right. Try to remove the feet and check the result.

Hi, hyltom.

I don't understand exactly jdp and your mean for my poor english.

what is the feet?

Mine (english) is not better ...

feet = foot = base of the glass

aha,

but as you can see my second test, the glass is no problem.

When I rendered only water, the same result.

Here is my test....i just used an mxi with a white plan on the left to light the scene.



In this test, the first glass is made from one open surface,
the second one is a 2mm thinkness glass (volume) and the third one is a cone (volume).

I have done another test by lighting from the top and at that time i get the same result as you...now i think the result is correct and due to the refraction.

Thank you for the good test, hyltom.

I agree with you. refraction.

Here is my updated render.



Still noisy but for my poor computer power, I couldn't get more clean render.

Here is another weird thing.

my 4th glass has black reflection of bubbles. Is this due to refraction?



I hate a cone.