I was happy to read the instructions for a version 3.8 glass material, 
provided by Alain Martel

https://news.povray.org/povray.general/thread/%3Cweb.62e942de1adc8eb48a3c0aee5cc1b6e%40news.povray.org%3E/

and wanted to try them out myself. This is the result. The different 
variations include air bubbles and the albedo keyword in the cylinder, a 
scattering media inside the ovus, and appropriate fade_color and 
fade_distance for the different objects. The background is a hdr map, 
and a single additional point light are completing the setup.

A big thanks to Alain! This is an excellent starting ground for quality 
glass material indeed.

-- 
Thomas

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