After playing with the transparency fills, I came up with a couple of variations of shadowing in Swift3D V3.
Using the gray transparency fill, by adjusting the transparency slider in the material box one can change the outcome of the shadows cast through the object.
Now all we need is a refill, some more ice, a slice of orange and some ice cubes - oh, and maybe one of those little umbrellas
http://pristinetraffic.com/images/swift3d/sunset.html
Keep on swiftin!