25d39a0e_der_com___Revit_3D__March_2008__In_Revit_2009___
[Revit 2008 Feature] AccuRender radiosity and raytracing [For more information] Rendering an Image [In Revit 2009...] 
Revit Architecture 2009 now performs these functions automatically when it renders an image. You no longer need to perform these functions as separate steps.
BIMBuilder.com / Revit 3D: March 2008
In Revit 2009...