There is not a very detailed point in the glass textures. You can easily create this effect by using the Reflect and Refract options, and then giving the Fall Off effect to the Reflect channel. The issues that you have to pay attention to here are: you must keep the Fall Off value in balance from the Maps part. If this value remains at 100, there will be too much reflection and you will not be able to view the interior (Fig.03).
I didn't use direct sunlight, like V-Ray Sun, because I usually like to use cloudy weather in my scenes. I've also never used HDRi because I don't like the HDRi effect and color changes on the environment. For this reason, I prefer the V-Ray Dome light and this is what I used in this scene. I used an orange V-Ray Light Plane too because it needed to support the interior of the scene (Fig.04).
Rendering Settings F-Stop
As the F-Stop value increases, the diaphragm decreases and if the diaphragm becomes narrow then the Depth of Field (DOF) increases. This helps us to get a clear result, but when the diaphragm becomes narrow the brightness of the scene decreases.
This is a mechanical system that determines the duration of the light's reflection over the film. This duration is mostly given in terms of division of one second - for instance: 1/1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000 etc. The higher the duration, the more light that will reflect over the film.
ISO: Is the standard measuring system that measures light sensitivity. Higher ISO means higher brightness on the scene and this also brings a higher Noise rate (Fig.05).
Fig.05 - Click to enlarge
And here's the final image (Fig.06).
Special thanks to Fatih Civan for the Turkish to English translating.