The purpose of this was to create something simple and quick, to get away from the long-term projects. It shows how to set up liquids inside a transparent object in LuxRender. These require a little work, but once you start “following” the light ray as it is traveling through each volume in turn it’s actually very easy to set up.
Download .blend file here.
Blender 2.64 and Luxrender 1.0
Piitas blog 
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