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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric W99Hq1W;r
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 6A \Z221E
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ps=+wg?]
are commonly used in the design of illumination systems, especially those used in cA]Ch>]A%
the far field. \~ql_X;3
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface JU\wvP5j
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 2W]y9)<c
the model and “go off to infinity.” Exiting rays are the collection of ray segments P<GHX~nB
following the intersection point of a ray at a surface. Due to ray splitting, several p&4#9I5
ray segments may contribute to the candela data for each incident ray. Incident 1[Ffl^\ARp
rays are the collection of ray segments which intersect the selected surface. No *2tG07kI
surface selection is required for Missed rays but one is necessary for Exiting and }2-p= Y:6
Incident rays. >i IUS
The candela plots represent flux versus angle and can be smoothed using the O)i ]K`jk
Candela Options dialog box. The iso-candela plots can be presented as false | *J-9
color maps or contour plots. The distribution plots are graphs of cross-sectional ZRr S""V
curves through the candela distribution. *)H&n>"e
The orientation of the candela plots is determined by the Normal Vector and the 8NS1* \z
Up Vector, as specified in the Analysis|Candela Options dialog box. The %/(>>*}Kw|
normal vector specifies the axis of the candela plot and the up vector specifies ,) JSX o
“which way is up.”
