The tool overrides all your material, shadow and render settings while rendering and then restores the previous settings after the preview is rendered.
![Bercon preview render](http://www.niksula.cs.hut.fi/~jylilamm/Resources/BerconPreviewRender.jpg)
This allows you to render quick previews without having to go through all materials to set lower subdivs etc.Usage: Simply run the script.
http://www.niksula.cs.hut.fi/~jylilamm/tools.shtml