Enable Diffuse Lighting: Lets you create and adjust the direction of the light. This parameter must be activated to apply light source settings.
Note that when creating a 3D surface plot, if you do not activate Enable Diffuse Lighting and select a solid color under the Appearances tab, the 3D object will appear flat.
Inverse Face Normal Orientation: Inverts the direction that the light bounces off the surface of the 3D object. Note that Enable Diffuse Lighting must be activated to activate Inverse Face Normal Orientation.
Light Color: Specifies the color of the point, spot, or directional light.
To specify light color for point, spot, and directional light
1. Activate Enable Diffuse Lighting.
2. Click Light Color.
3. In the Color dialog, choose a color for the light.
4. Click OK.
Light Direction: Allows you to specify the direction of the light for Spot light source types. See the Light Source Type for directions on how to specify light direction.
Light Position: Allows you to specify the position of the light for Spot and Point light source types. See the Light Source Type for directions on how to specify light position.
Directional: Directional light has color and direction that you can control, but not position. The light it generates is referred to as parallel light; that is, all directional light travels through an object in the same direction.
To
specify directional light direction using the mouse
1. Activate Enable Diffuse
Lighting.
2. Activate Setup Light.
3. Under
Light Source Type, activate Spot.
4. Click OK.
In
the plot window, a light directional symbol 
appears.
This symbol represents the light direction. In the upper left corner of the plot
window, the x, y, and z coordinates of the direction of the light source are
displayed.
5. To control position of the light directional symbol, hold
down CTRL+drag-the-mouse.
As you drag the mouse the light directional
symbol moves accordingly and sheds light on the 3D object
appropriately.
Point: Point light has color and position that you
can control; however, it has no single direction. That is, it gives off light
equally in all directions.
To
specify point light position and range through the dialog
1.
Activate Enable Diffuse Light.
2. Under Light Source Type,
activate either Point or Spot.
3. Enter the Light
Position coordinates under X, Y, and Z.
4. Under
Range, enter a value that indicates how far the light travels.
5. Click
OK.
The plot window will reflect the light position you have
specified and light the object accordingly.
Spot: Spot light has
color, position, and direction that you can control. The light emitted from a
spot light has a narrowly focused inner cone of light as well as an outer cone
of light. The light intensity diminishes as it reaches the outer cone, and there
is no light beyond the outer cone. To control the size of the inner and outer
cones, the elements Phi and Theta are used. The following illustration shows the
relationship between these elements:
To specify spot light position, direction, range Phi, and
Theta through the dialog
You can only enter the range, Phi,
and Theta values through the dialog.
1. Activate Enable Diffuse
Light.
2. Under Light Source Type, activate Spot.
3.
Enter the Light Direction coordinates in the corresponding X,
Y, and Z text boxes.
4. Enter the range, Phi,
and Theta values in the corresponding text boxes.
5. Click
OK.
The plot window will reflect the light position you have
specified and light the object accordingly.
To specify spot light position and direction using the mouse
1. Activate Enable
Diffuse Lighting.
2. Activate Setup
Light.
3. Under Light Source Type, activate
Point.
4. Click OK.
In the plot window, a
positional/directional symbol 
appears, which represents the light source.
In the upper left corner of the plot window, the X, Y, and Z coordinates of the
position and direction of the light source are displayed.
5. To control
the position of the light source, CTRL+right-click and drag to move the
symbol and shed light on the 3D object
appropriately.
6. To control the direction of the light source,
CTRL+click and drag to move the arrow attached to the 
symbol and shed light on the 3D
object appropriately.
Phi: Specifies the inner cone of a Spot light source. See Light Source Type for Phi specifications.
Range: Allows you to specify the range of the light for a Spot light source. See Light Source Type for light range specification directions.
Setup Light: Lets you control the position and direction of the light using the mouse. For more information, see Light Source Type.
Theta: Allows you to specify the outer cone of a Spot light source. See Light Source Type for Theta specification directions.