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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric )R|7> 97
units, a luminous intensity plot is in units of candelas (lumens per steradian). In fC-^[Af )
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 1z`,*eD7
are commonly used in the design of illumination systems, especially those used in zJsoenU
the far field. pP
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface AzV5Re8M
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” s{IoL_PJP
the model and “go off to infinity.” Exiting rays are the collection of ray segments 7d<v\=J}
following the intersection point of a ray at a surface. Due to ray splitting, several ]u,~/Gy
ray segments may contribute to the candela data for each incident ray. Incident <VBw1|)$@
rays are the collection of ray segments which intersect the selected surface. No x)?\g{JH
surface selection is required for Missed rays but one is necessary for Exiting and ry T8*}o
Incident rays. Q?tV:jogY
The candela plots represent flux versus angle and can be smoothed using the g|zK%tR_P
Candela Options dialog box. The iso-candela plots can be presented as false M ? 3N
color maps or contour plots. The distribution plots are graphs of cross-sectional ,qfa,O
curves through the candela distribution. \% C[l
The orientation of the candela plots is determined by the Normal Vector and the 5^Y/RS i
Up Vector, as specified in the Analysis|Candela Options dialog box. The UQ8x #(`ak
normal vector specifies the axis of the candela plot and the up vector specifies P~ykC{nD
“which way is up.”
