2011

Table Of Contents
can compute the luminous intensity along an arbitrary direction by
interpolation.
NOTE Web distribution is used only in rendered images. Weblights are
approximated as point lights in the viewport.
NOTE You can control the size of a web glyph from Tools menu > Options >
Drafting > Light Glyph Settings. Some web glyphs may appear very small on screen
and may need to be adjusted.
Goniometric Diagrams
Photometric data is often depicted using a goniometric diagram.
Goniometric diagram of a web distribution
This type of diagram visually represents how the luminous intensity of a source
varies with the vertical angle. However, the horizontal angle is fixed and,
unless the distribution is axially symmetric, more than one goniometric
diagram may be needed to describe the complete distribution.
Photometric Webs
The photometric web is a three dimensional representation of the light
distribution. It extends the goniometric diagram to three dimensions, so that
the dependencies of the luminous intensity on both the vertical and horizontal
angles can be examined simultaneously. The center of the photometric web
represents the center of the light object.
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