Customize menu > Preferences > Preference Settings dialog > Radiosity tab
On the Radiosity panel of the Preference Settings dialog, you set options for the radiosity solution.

Automatically Process Refine Iterations Stored in Geometric Objects—When on, all refine iterations stored in geometric objects are automatically processed.
Save Scene Information in MAX file—The light levels from the advanced lighting solution are always saved with the file, however when this is on, some additional radiosity information is saved with your scene.
Note: Having this on decreases file load time, but increases the file size.
Display Reflectance & Transmittance Information—When on, reflectance and transmittance values are displayed in the Material Editor.
Note: In order to make this change effective, you need to close and restart the Material Editor.
Display Reset Warning—When on, a warning message is displayed whenever you reset the advanced lighting solution in your scene.
Display Undo Warning on Properties Change— When on, a warning message is displayed whenever you change the advanced lighting properties of an object in your scene and continue the advanced lighting calculation.
Web Designer - offers freelance web design services, redesign, graphic design, content
management, web development and e-commerce.
LTD