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Comment by George Ioannidis on November 16, 2012 at 12:10pm

Very nice Decio! Great job.

Comment by Marc Chaumier on November 16, 2012 at 1:45pm

Good job Decio. Is the glass material totally transparent? (transparency on 1.0)

Comment by akinlolu olugboji on November 16, 2012 at 2:53pm

No as I can still see the reflection of trees and cars in it.

Comment by Marc Chaumier on November 17, 2012 at 4:53am

Akin, these reflections are drived by the IOR parameter. When you put the transparency to 1.0, and if the IOR is different from 1.0 (more than 1.0), so you obtain reflections.

Comment by akinlolu olugboji on November 17, 2012 at 9:48am

Thanks, for the info, physics has being a while. Always associated air with IOR 1.

Comment by Roy Hirshkowitz on November 17, 2012 at 10:00am

Air is 1 (usually).  Most architectural glass is around 1.5 these days.  That will reflect.  For physically accurate glass, the transparency setting should always be 1.0.  The color should be reduced to 92-95% or so.

Comment by Marc Chaumier on November 18, 2012 at 7:35am

Sometime I put a little bit of blue in reflection.

Roy, what di you mean by "The color should be reduced to 92-95%"?

Comment by Roy Hirshkowitz on November 18, 2012 at 9:34am

RGB Color components should be reduced to 245 or so for physically-based glass.

Comment by Decio Baptistucci on November 19, 2012 at 10:58am

Hi everybody, I made this picture one year ago, so I had to look that file again, and found this configuration for the glass.

Transparency - 1.00 , IOR - 1.440

Color - R=223, G=226, B=225

Fresnel - 1.000

Comment by Roy Hirshkowitz on November 19, 2012 at 2:11pm

Those are all believable settings for glass.  The simulation should be a good one.

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