Secondly, we have a new acceleration technique for bidirectional path tracing that helps with the rendering of light through glass. In particular, it greatly improves rendering of the ‘sunlight through glass’ type of lighting, where the camera is outside a building looking in through a window into an interior that is also illuminated by sunlight.
The accleration option is called ‘Architectural Glass Acceleration’ and can be enabled by setting
<glass_acceleration>true</glass_acceleration>
to true in your inifile.xml or renderer_settings inside your scene. Support for this option should be made availble soon by the exporter writers.
Architectural Glass Acceleration is an unbiased technique that makes no approximations.
It can slow down rendering a little bit, so for scenes with no architectural glass, it should be set to false.
Changelog:

• Added Architectural glass acceleration option ‘glass_acceleration’
• Added 30 day trial which allows rendering at high res with watermarks for 30 days.

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