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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric &<&tdShI
units, a luminous intensity plot is in units of candelas (lumens per steradian). In g~lv/.CnA+
radiometric units, an intensity plot is in units of watts per steradian. Candela plots MZgaQU g
are commonly used in the design of illumination systems, especially those used in !np_B0`
the far field. ~i,d %a
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 9~SPoR /_0
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Sd +5Uf `
the model and “go off to infinity.” Exiting rays are the collection of ray segments @0 +\:F
following the intersection point of a ray at a surface. Due to ray splitting, several U2Ve @.
ray segments may contribute to the candela data for each incident ray. Incident L+t
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rays are the collection of ray segments which intersect the selected surface. No B=SA
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surface selection is required for Missed rays but one is necessary for Exiting and JrP`u4f_
Incident rays. ,@*5x'auK
The candela plots represent flux versus angle and can be smoothed using the (zhZ}C,VF
Candela Options dialog box. The iso-candela plots can be presented as false O=K
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color maps or contour plots. The distribution plots are graphs of cross-sectional Z{8%Cln
curves through the candela distribution. L]Tj] u )
The orientation of the candela plots is determined by the Normal Vector and the `M@ESA (e
Up Vector, as specified in the Analysis|Candela Options dialog box. The
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normal vector specifies the axis of the candela plot and the up vector specifies rZK h}E
“which way is up.”
