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1342 Chapter 15: Lights and Cameras
To make the shape of the light fi t t he proj ected
bit map :
Note:
This procedure only applies to standard spot
and direct lights.
1. Choose a bit map to project, as described in the
preceding procedures.
2. Make sure the light’s shape is set to Rectangular,
and then click Bitmap Fit.
A file select ion dialog is displayed.
3. Choosethesamebitmapyouchoseforthe
standalone map, and then click OK.
You can also choose a bitmap other than the
one the li ght projects.
Inter face
Affect Surfaces group
Co ntrast— Adjusts the contrast b e tween the diff use
and ambient areas of the surface. Leave this set to 0
for normal con trast. Increase the value to increase
the contrast for special effects: for example, the
harsh light of outer space. Default=0.0.
Sof ten Dif f use Ed ge—Increasing the value of Soften
DiffuseEdgesoftenstheedgebetweenthediffuse
and ambient portions of a surface. This helps
eliminateedgesthatcanappearonasurfaceunder
certain circumstances. Default=50.
Note: Soften Diffuse Ed ge reduces the amount of
light, slightly. You can counter this, to some extent,
by increasing the Multiplier value.
Diffuse—When on, the light affects the diffuse
properties of an object’s surface. When off,
the light has no effect on the diffuse surface.
Default=on.
Specular—When on, the light affects the specular
properties of an object’s surface. When off, the
light has no effect on the spe cular properties.
Default=on.
For example, by using the D iff use and Specular
check b oxes you can have one light color the
specular highlights of an object, while not color ing
its diffuse area, and then have a second lig ht
color the diffuse portion of the surface while not
creating specular highlights.
Ambient Only—When on, the light affects only
the ambient component of the illumination. This
gives you more detailed control over the ambient
illumination in your scene. When Ambient Only
is on, Contrast, Soften Diffuse Edge, Diffuse, and
Specular are unavailable. Default=off.
The effect of Ambient Only isn’t visible in
view por ts. It appears only when you render the
scene.
A: Affect specular only
B: Affect diffuse only
C: Affect ambient only