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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric z muR n4Nv
units, a luminous intensity plot is in units of candelas (lumens per steradian). In sGiK
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radiometric units, an intensity plot is in units of watts per steradian. Candela plots 8eh3K8tL#
are commonly used in the design of illumination systems, especially those used in N5#j}tT
the far field. ^I6Vz?0Jl
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface X?u=R)uG
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” *>EV4Hl
the model and “go off to infinity.” Exiting rays are the collection of ray segments =SW <Vhtb
following the intersection point of a ray at a surface. Due to ray splitting, several jC >mDnX
ray segments may contribute to the candela data for each incident ray. Incident #U3q
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rays are the collection of ray segments which intersect the selected surface. No (B@\Dw8^
surface selection is required for Missed rays but one is necessary for Exiting and ^xgPL'
Incident rays. EN}4-P/5
The candela plots represent flux versus angle and can be smoothed using the ]<%NX
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Candela Options dialog box. The iso-candela plots can be presented as false 7FaF]G
color maps or contour plots. The distribution plots are graphs of cross-sectional /{[tU-}qJ
curves through the candela distribution. F$ |d#ny
The orientation of the candela plots is determined by the Normal Vector and the )"tM[~e`
Up Vector, as specified in the Analysis|Candela Options dialog box. The 3T 0'zJ2f
normal vector specifies the axis of the candela plot and the up vector specifies w!d(NA<|0]
“which way is up.”
