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1170 Chapter 15: Lights and Cameras
Aphotometricwebisa3Drepresentationof
the light intensity distribution of a light source.
Web definitions are stored in files. Many lighting
manufacturers provide web fi les that model their
products; these are often available on the Internet.
Awebfilecanbeinthe
IES (page 2–1172) , LTLI
(page 3–1058)
,or CIBSE (page 3–1015) format.
Controls for assigning the web file are on the Web
Parameters rollout.
Example of web distribution
Various web distributions
See also
Lights (page 2–1126)
Target Point Light (Photometric) (page 2–1157)
Free Point Light (Photometric) (page 2–1158)
Target Linear Light (Photometric) (page 2–1159)
Free Linear Light (Photometric) (page 2–1160)
Target Area Light (Photometric) (page 2–1161)
Free Area Light (Photometric) (page 2–1162)
Intensity/Color/Distribution Rollout (page
2–1197)
Web Parameters Rollout (page 2–1199)
IES Standard File Format (page 2–1172)
Procedure
To create a light from a manufacturer’s I ES f ile:
1.
OntheCreatepanel,clickLights.
2. Choose Photometric from the drop-down list.
(The default is Standard.)
3. In the Object Ty pe rollout, select any
photometric light type.
4. In the Intensity/Color/Distribution rollout,
select Web f rom the Distribution list.
5. If you are creat ing a Target Point, Linear, or
Area light, drag in a viewport. The initial point
of the drag is the location of the light, and
thepointwhereyoureleasethemouseisthe
location of the target. If you are creating a Fre e
Point, Linear or Area light, click in a viewpor t
to position the light.
A light is created using the default photometric
web w hich is a diffuse distr ibution shining from
one edge.
6. Go to the Web Parameters rollout, and select
the IES file that you want to use. See
Web
Parameters (page 2–1199)
.
7. Set the creation parameters.
You can use the Move tr ansform to
position the
light (page 2–1136)
.Youcanalsousethe Place
Highlight (p age 1–452)
command to change
alight’sposition.