Utilities panel > Click More. > Utilities dialog > Choose Lightscape Materials. > Lightscape Materials rollout
With the Lightscape Materials utility, you can add the Lightscape material to multiple objects, and remove the Lightscape radiosity material from multiple objects.

Displays the name of the currently selected object. If no objects are selected, displays None Selected. If more than one object is selected, displays Multiple Selected.
Add to All—Click to add a Lightscape material to all materials used by all objects in the scene.
An object's previous material, if any, becomes the Lightscape material's base material. If a material is already using a Lightscape material, it remains unchanged.
You set the new Lightscape material's values in the Radiosity Mapping group, described below.
Add to Selected—Clicking to add a Lightscape material to all materials used by the current selection.
An object's previous material, if any, becomes the Lightscape material's base material. If a material is already using a Lightscape material, it remains unchanged.
You set the new Lightscape material's values in the Radiosity Mapping group, described below.
Remove from All—Click to remove the Lightscape material from all materials used by all objects in the scene.
Each material's base material becomes the top-level material. If a material is not using a Lightscape material, it remains unchanged.
Remove from Selected—Click to remove the Lightscape material from all materials used by the current selection.
Each material's base material becomes the top-level material. If a material is not using a Lightscape material, it remains unchanged.
These parameters are used only when you add the Lightscape materials. They set the initial values of the new Lightscape material.
Brightness—Controls the brightness of the displayed image on your monitor. The setting of this control does not affect the actual lighting levels in the model. Default=50.0.
Contrast—Controls the contrast between light and dark regions in the model. Default=50.0.
Ambient Light—Controls the amount of Autodesk VIZ ambient light that will be mixed in with the radiosity calculations. If the value is 0.0, none of the Autodesk VIZ ambient light is used. If the value is 1.0, the full Autodesk VIZ ambient light is added into the radiosity calculations. Default=0.0.
Daylight—Determines whether you want natural daylight to be used in the calculation. Default=on.
Exterior Scene—Used for exterior daylight simulations. Default=off.