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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric HC,Se.VYS
units, a luminous intensity plot is in units of candelas (lumens per steradian). In D >tR-
radiometric units, an intensity plot is in units of watts per steradian. Candela plots TWF r
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are commonly used in the design of illumination systems, especially those used in Jg| XH
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the far field. ~R92cH> L
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface RrQJ/ts7}
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” \P`hq^;
the model and “go off to infinity.” Exiting rays are the collection of ray segments 0KOgw*>_
following the intersection point of a ray at a surface. Due to ray splitting, several W:L
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ray segments may contribute to the candela data for each incident ray. Incident %8~NqS|=
rays are the collection of ray segments which intersect the selected surface. No r<^HmpUJ
surface selection is required for Missed rays but one is necessary for Exiting and 'SF<_aS(
Incident rays. W9GVt$T7
The candela plots represent flux versus angle and can be smoothed using the >V}#[ / n
Candela Options dialog box. The iso-candela plots can be presented as false `RL"AH: +
color maps or contour plots. The distribution plots are graphs of cross-sectional WEi2=3dV
curves through the candela distribution. z ~ /` 1
The orientation of the candela plots is determined by the Normal Vector and the q5)O%l !
Up Vector, as specified in the Analysis|Candela Options dialog box. The 5"O.,H}
normal vector specifies the axis of the candela plot and the up vector specifies 7%eK37@u
“which way is up.”
