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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric U: 9&0`k(
units, a luminous intensity plot is in units of candelas (lumens per steradian). In &`D$w?b eg
radiometric units, an intensity plot is in units of watts per steradian. Candela plots OdzeHpH3g
are commonly used in the design of illumination systems, especially those used in |#TU"$;
the far field. FZe/3sY
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface smn"]K
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” sl' 4AK~\
the model and “go off to infinity.” Exiting rays are the collection of ray segments oB:7 R^a
following the intersection point of a ray at a surface. Due to ray splitting, several 11H`WOTQF
ray segments may contribute to the candela data for each incident ray. Incident 5
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rays are the collection of ray segments which intersect the selected surface. No 6j%%CWU{~
surface selection is required for Missed rays but one is necessary for Exiting and P3zUaN \c
Incident rays. O =Z}DGa+
The candela plots represent flux versus angle and can be smoothed using the gX}'b\zxC
Candela Options dialog box. The iso-candela plots can be presented as false hY"eGaoF"
color maps or contour plots. The distribution plots are graphs of cross-sectional e+ [*4)Qfy
curves through the candela distribution. .p#kW:zspA
The orientation of the candela plots is determined by the Normal Vector and the ?JrUZXY
Up Vector, as specified in the Analysis|Candela Options dialog box. The p _gN}v
normal vector specifies the axis of the candela plot and the up vector specifies t 7Q$
“which way is up.”
