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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric CT@ jZtg0
units, a luminous intensity plot is in units of candelas (lumens per steradian). In yu {d! {6
radiometric units, an intensity plot is in units of watts per steradian. Candela plots X #dmo/L8
are commonly used in the design of illumination systems, especially those used in OKZV{Gja
the far field. TprTWod2]t
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface tIi &;tw]
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” FZ QP%]FX
the model and “go off to infinity.” Exiting rays are the collection of ray segments iXkF1r]i
following the intersection point of a ray at a surface. Due to ray splitting, several S\EyCi+
ray segments may contribute to the candela data for each incident ray. Incident GAzU ?a{S
rays are the collection of ray segments which intersect the selected surface. No ^0 )g/`H^>
surface selection is required for Missed rays but one is necessary for Exiting and SGRp3,1\4%
Incident rays. ~NgA
The candela plots represent flux versus angle and can be smoothed using the y1 D L,%j
Candela Options dialog box. The iso-candela plots can be presented as false 5ta `%R_
color maps or contour plots. The distribution plots are graphs of cross-sectional pad*oPH,
curves through the candela distribution. )m+W
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The orientation of the candela plots is determined by the Normal Vector and the ja'T+!k
Up Vector, as specified in the Analysis|Candela Options dialog box. The NYUL :Tp
normal vector specifies the axis of the candela plot and the up vector specifies ;+_:, _
“which way is up.”
