Transparent BG; no longer?

[DMerz III]

Hey guys,

I'm completely dumbfounded at the moment, I thought I used to be able to render an image in .tif format with transparency turned on, with a physical ground plane set to the default ground material, and get an output image where the shadow blends off into alpha transparency. Is that no longer an option in KS8?

[DMerz III]

  Figured out my issue. I wasn't rendering in product mode. I couldn't get it to work with interior mode. (I usually work in product mode). Is that probably the culprit?

[FJEGA]

they say refraction makes inaccurate background (in astill image!), so they  taken away the issue
only basic glas works, so i need liquid inside a glass i cannot


Now i have to guess those letters below