the next steps, you light part of the desk by creating a spotlight
and positioning it within the desk lamp. A spotlight emits
light from a single point within a limited cone angle. You can aim
a spot light in the direction you want the light to illuminate.
To create a spotlight
Create > Lights > Spot Light > .
- Turn off Interactive Placement,
then click Create.
This creates the spotlight’s
icon at the center of the grid. The light points toward the back
- Move the spotlight above the lamp. (Drag
the light up along its local Y-axis.)
If you look at the spotlight
icon from several angles, you’ll notice that it is shaped like a
cone with an arrow pointing out of it.
The cone symbolizes that
a spotlight emits a beam of light that gradually widens with distance.
- Select Modify > Transformation
Tools > Show Manipulator Tool. See
Modify > Transformation Tools > Move Tool, Rotate Tool, Scale Tool, Show Manipulator Tool for
the spotlight selected, this tool provides two manipulators that
you can move to position and aim the light precisely.
The look-at point specifies
where the light focuses. The eye point defines the position of the
light source. All types of lights have an eye point, but not necessarily
a look-at point.
- Move the look-at point to the top of
the table, and move the eye point roughly to the center of the lamp
You can also use the Rotate tool
to center the eye-point more accurately in the lamp housing.
An alternative way to position a spotlight
is to select the light and then select Panels > Look Through
Selected. You can then dolly and pan the view to focus
on the desired surface. The area of focus is where the light strikes
the surface. To return to the perspective view select Panels
> Perspective > persp.
- If you render the scene, you’ll notice
that the spotlight lights up a circular region on both the desk
and the floor.
By default, light passes
through and lights up each surface in its path. The circular region
of light is wider on the floor than the desk because a spotlight
emits a beam of light that widens with distance.
Only the floor, not the
desk, will be lit by the spotlight in the scene view. You’ll see
the desk lit up only if you render the scene.
- You can prevent the light from passing
through the table. With the light selected, display the Attribute
Editor. Open its Shadows section and then the Depth
Map Shadow Attributes section, then turn on Use
Depth Map Shadows. Rendering creates this result:
By turning on Use
Depth Map Shadows, the spotlight’s lighting is blocked by
the first surface it hits (the desk). The floor is in the shadow
of the desk so it receives no light. You’ll learn more about Depth
Map Shadows later in the lesson.