At first, I tested the Indigo and Luxrender using the glass materials, and it takes ages to render. They are great renderers, and with YafaRay with the right settings, it can also create great images, and fast.
The glass mugs are modeled using Blender and here’s the Direct light setting for me:
Direct Lighting setting:
Here’s the Photon Mapped render:
Photon Mapping setting:
For added effects I composite the photon mapped exr image file in Blender by adding glow.
Therefore, the Direct Lighting can also produce nice render in a fastest time with the right AO settings, and less noise. The Photon Mapping method is more of a bouncing light, thus produce more realism imagery.