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Rendering with Arnold in CINEMA 4D using the C4DtoA plug-in.
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refraction issues on glass bottle

4 REPLIES 4
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Message 1 of 5
ulrichGTAV3
163 Views, 4 Replies

refraction issues on glass bottle

Hi all,

a couple of years ago I created a bottle and rendered it in Redshift:

bottleRedshift.jpg

And I was happy with it for what I needed.

 

Now I tried to recreate the Materials in Arnold.

My lights and the stage setup is a bit different and I still have to tweak the juice transmission and the glass roughness. Pleace ignore those differences for now.

 

My problem is the refraction of the bottle glass. In particular on the edges of the bottle. In Redshift the juice filling appears up to the outermost edge of the glass (which seams to be the case in real life).

In Arnold you can clearly see the thickness of the glass. 

IOR in both cases is at 1.33 and the geometry is exactly the same.

 

Is there any other setting(s) that I should adjust?

bottleArnold.png

 

Thank you very much!!

 

4 REPLIES 4
Message 2 of 5
lee_griggs
in reply to: ulrichGTAV3

The glass IOR should be 1.5. Is the liquid overlapping the bottle geometry? Are the normals pointing outwards? More information here:

https://docs.arnoldrenderer.com/display/A5AFCUG/Rendering+Glass+Surfaces+with+Arnold

https://www.youtube.com/watch?v=GkVIEV_0Ujs

 

Are you using ACES, btw?

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 3 of 5
ulrichGTAV3
in reply to: ulrichGTAV3

The you are right about the IOR of glass, of course. But that does not make that much difference. Normals are all correct. What seems to be the issue is the overlapping. I had the filling a fraction of a C4D unit smaller than the inside of the bottle. Has to be a fraction bigger. 

Thank you very much!

Message 4 of 5
ulrichGTAV3
in reply to: lee_griggs

About ACES: No, that is something I should dive into. But color space stuff always was a pita for me. Already way back when I did print stuff. 

Message 5 of 5
lee_griggs
in reply to: ulrichGTAV3

I know what you mean, but it is well worth it. The results will look much more photographic.

Lee Griggs
Arnold rendering specialist
AUTODESK

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