TYPE: Object State
TITLE: Light Operation

The Light operation is used to manipulate light parameters interactively.
This operation allows you to move and orient your light and modify cone 
and frustum parameters through the use of three handles.

ORIENTATION HANDLE

The Orientation Handle allows you to move and orient the light.  It behaves
like the camera's Orientation Handle.  Please see the Camera operation help
for more information.

CONE HANDLE

The Cone Handle allows you to manipulate the cone parameters for your light.
Click on the dotted lines to turn the Point Light into a Cone Light.  Once
the cone handle is enabled, you can use it to set the cone angle and the
cone delta of the light by dragging on the circles at the end of the cone.
The size of the cone can be adjusted by sliding the box bead that appears at
the end of the cone.  Sizing the cone is only used for visualization and does
not affect the rendering of your light.

FRUSTUM HANDLE

The Frustum Handle allows you to modify the light's view frustum parameters
as in the camera operation.  Please see the camera operation help for more
detail.  Using the right-mouse menu, it is possible to enable the linking
of the frustum to the cone angle.  When this is enabled, changes in the 
cone angle will affect the frustum and vice-versa.
