Graphics Programs Reference
In-Depth Information
Attenuation/filterColor/eXit] <eXit>: Enter or
option
The options for this command are as follows; most are the same as those for point
lights:
•
Name
: This allows us to give a name to the light.
•
Intensity factor
: This allows us to specify an intensity or brightness, with
a value starting from zero.
•
Status
: This allows us to turn the light on or off.
•
Photometry
: This option is only available with photometric lighting and
allows us to specify the intensity and color in lighting units, such as can-
dela, lux, or foot-candle.
Color
allows us to specify the color of the light
based on a name or temperature in Kelvins.
•
Hotspot
: This specifies the cone angle of constant intensity, with a value
ranging from
0
degrees to
160
degrees.
•
Falloff
: This specifies the total cone angle, including fading intensity, with
a value ranging from
0
degrees to
160
degrees. It is never less than the
Hotspot
value. Outside this cone angle, there will be no light.
•
shadoW
: This allows us to turn the shadows' projection on or off and se-
lect its type to be sharp or soft.
•
Attenuation
: With generic lighting, it allows defining attenuation with dis-
tance for the light. The
attenuation Type
option controls if there is no
attenuation (
None
), if it's linear (
Inverse linear
), or quadratic (
Inverse
Squared
). With
Use limits
, we define two distances for starting and for
ending. With photometric lighting, attenuation is set to
Inverse Squared
and cannot be modified.
•
filterColor
: This controls light color, allowing us to choose between a true
color (red, green, and blue values, separated by commas), an AutoCAD
color, or a color topic
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