Mark,
Since I don't have a glass sphere, I whipped this up in Cinema to validate your observations. I cranked the refraction up to 4 and DOH! You're right! I can just slightly make out the "spherical" effect but then I suspect that the refraction for a shere might be realistically higher than 4 (it's as high as Cimena would allow). Transparency at 21% brightness.
Rich
Since I don't have a glass sphere, I whipped this up in Cinema to validate your observations. I cranked the refraction up to 4 and DOH! You're right! I can just slightly make out the "spherical" effect but then I suspect that the refraction for a shere might be realistically higher than 4 (it's as high as Cimena would allow). Transparency at 21% brightness.
Rich