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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 5 9HaTq
units, a luminous intensity plot is in units of candelas (lumens per steradian). In uB"m ! dL
radiometric units, an intensity plot is in units of watts per steradian. Candela plots .vF< 3p|
are commonly used in the design of illumination systems, especially those used in )7mJ+d[
the far field. /
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Sq]1S W3
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” &{{f|o=u.
the model and “go off to infinity.” Exiting rays are the collection of ray segments /1
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following the intersection point of a ray at a surface. Due to ray splitting, several -t#a*?"$w
ray segments may contribute to the candela data for each incident ray. Incident aq| [g
rays are the collection of ray segments which intersect the selected surface. No vX24W*7
surface selection is required for Missed rays but one is necessary for Exiting and #/=yz<B
Incident rays. s(LqhF[N2]
The candela plots represent flux versus angle and can be smoothed using the fB}5,22
Candela Options dialog box. The iso-candela plots can be presented as false d"a7{~l
color maps or contour plots. The distribution plots are graphs of cross-sectional zszx@`/3
curves through the candela distribution. U>jk`?zW
The orientation of the candela plots is determined by the Normal Vector and the T mE4p
Up Vector, as specified in the Analysis|Candela Options dialog box. The <:t\P.
normal vector specifies the axis of the candela plot and the up vector specifies )F 2tV ]k\
“which way is up.”
