IOR too strong?

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DayVids
Licensed Customer
Posts: 350
Joined: Tue May 11, 2010 2:35 am

ok, it seems to me that the IOR is too strong on this glass, i've got glasses that are this thick at home, and it doesn't seem like they're so strongly obscured.

I pulled the glass from the live DB, and I also did some different testing of my own with values that I found online.

is IOR being calculated incorrectly or am I crazy ( highly possible ).

It's not very many samples, but you see what i'm talking about.( I've attached the mesh so you can see the thickness of that as well, doesn't make sense to me that it should be that strong, but what do I know, maybe I'm wrong? (likely)
Attachments
here's the mesh so you can see the thickness, etc.. of the glass
here's the mesh so you can see the thickness, etc.. of the glass
IOR from live DB glass
IOR from live DB glass
CPU - i7-950 3.06 Ghz, 24GB Ram, Win7 x64, 2 display monitors, GeForce GTX 580 3GB Classified. I'm glad to say I LOVE OCTANE!
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radiance
Posts: 7633
Joined: Wed Oct 21, 2009 2:33 pm

Hi,

Please post a screenshot of your material setup,
and use a better testscene.
something with a grid or something so we can see what's going on...

also post your kernel settings pls.

Radiance
Win 7 x64 & ubuntu | 2x GTX480 | Quad 2.66GHz | 8GB
DayVids
Licensed Customer
Posts: 350
Joined: Tue May 11, 2010 2:35 am

Hi Radiance, I used the live DB materials for glass and for water on the glass with water in it.

Not sure where I can view the kernel settings, but I took an image of import settings incase that would be helpful, and the node settings, etc... see below.

checkboard is the live db check board set to a value of 100

all other materials are live db default.

Thanks.
Attachments
2nd glass DB material settings
2nd glass DB material settings
import settings
import settings
glass with standard check board set to 100 from materials in live db
glass with standard check board set to 100 from materials in live db
CPU - i7-950 3.06 Ghz, 24GB Ram, Win7 x64, 2 display monitors, GeForce GTX 580 3GB Classified. I'm glad to say I LOVE OCTANE!
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radiance
Posts: 7633
Joined: Wed Oct 21, 2009 2:33 pm

can you send me these testscenes ?
maybe zip them up and send to terrence at ourcompanyname dot com

We do use a propper fresnel, not the schlick approximation, so it should be correct, but the image indeed looks weird.

Radiance
Win 7 x64 & ubuntu | 2x GTX480 | Quad 2.66GHz | 8GB
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kivig
Licensed Customer
Posts: 152
Joined: Fri Apr 09, 2010 10:42 pm
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I had same issue. It was ok when i flipped normals.
Guess they get flipped somewhere on the way to rendering.
Btw. My issue was with cylinder glass too.
http://www.visnevskis.com
Vista64/Ubuntu, GTX470/580
DayVids
Licensed Customer
Posts: 350
Joined: Tue May 11, 2010 2:35 am

flipping normals does nothing for me.

I've got a very similar candle holder, I'll be happy to post a photograph of to see what it "should" look like :)
CPU - i7-950 3.06 Ghz, 24GB Ram, Win7 x64, 2 display monitors, GeForce GTX 580 3GB Classified. I'm glad to say I LOVE OCTANE!
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