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Material looks black through glass, why?

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Suzanne Hemphill
Material looks black through glass, why?
on Jan 11, 2012 at 4:33:26 pm

I have modeled a beer glass and the object inside the glass (the beer and foam) is looking black when rendered even though the material is a light color.

Can anyone tell me why that is or how to fix it? I am using the Glas 001 material that comes with C4D for the glass. I just don't know enough about materials is seems...

Thanks so much for any help!

Suzanne
MaD Studio


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Brian Jones
Re: Material looks black through glass, why?
on Jan 11, 2012 at 10:47:20 pm

did you copy the inside of the glass to make your liquid? If so, they both occupy the same physical space and it will render badly the liquid should be a little smaller or a little bigger (actually penetrating the glass) - anything as long as the polys don't occupy the same exact space.

Otherwise it could be the Ray Depth settings in Render Settings but if it's at the default 15 it's probably not that.


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Suzanne Hemphill
Re: Material looks black through glass, why?
on Jan 11, 2012 at 11:00:54 pm

I tried scaling it a little smaller and also a little larger to penetrate the glass, but neither one worked.

I am using the Physical renderer with the Ray Depth at 15.

The bottom liquid is a different object than the object that is rendering black. I just put a simple white material on it just to test, but it keeps rendering black. I found the beer texture for the bottom object online and just modified it slightly. I just can't figure out why it works and the other does not.

Any clues for me to know what to try would be wonderful.

Thanks so much!



Suzanne
MaD Studio


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Adam Trachtenberg
Re: Material looks black through glass, why?
on Jan 11, 2012 at 11:24:19 pm

Weird. Any chance you can upload the file?


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Suzanne Hemphill
Re: Material looks black through glass, why?
on Jan 11, 2012 at 11:32:36 pm

Here it is. I hope you can see something dumb I've done...

3531_beerupload.c4d.zip

Suzanne
MaD Studio


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Adam Trachtenberg
Re: Material looks black through glass, why?
on Jan 12, 2012 at 12:52:03 am

Okay, I think the problem is ambient occlusion. Since the foam is so close to the glass it's just turning black.


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Suzanne Hemphill
Re: Material looks black through glass, why?
on Jan 12, 2012 at 2:41:57 pm

Adam, you are a freakin' genius!

I knew there had to be some little setting somewhere that was messing me up. Thank you so much for finding it!!!

Have a fantastic day! :-)

Suzanne
MaD Studio


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Juan Manuel Palomino Domínguez
Re: Material looks black through glass, why?
on Nov 4, 2015 at 6:17:21 pm

I have the same problem Adam. May you tell watch should i adjust in ambient occlussion for getting better results? Thank you!


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Ryan Paterson
Re: Material looks black through glass, why?
on Nov 6, 2015 at 10:12:52 pm

Add a compositing tag to the object that's giving you trouble and un-check "Seen by AO"


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Paul Carder
Re: Material looks black through glass, why?
on Apr 6, 2016 at 10:11:34 am

Ryan - thank you so much! I had the same problem, and you've solved it for me! Legend.


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