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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric $ t_s7
units, a luminous intensity plot is in units of candelas (lumens per steradian). In K,%H*1YKK
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ( :]. ?o
are commonly used in the design of illumination systems, especially those used in vG#|CO9
the far field. ]"q[hF*PM
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ~ C6< 75
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” l*("[?>I
the model and “go off to infinity.” Exiting rays are the collection of ray segments fDp_W1yH
following the intersection point of a ray at a surface. Due to ray splitting, several ^"K
ray segments may contribute to the candela data for each incident ray. Incident zMt "ST.
rays are the collection of ray segments which intersect the selected surface. No &M=12>ah]
surface selection is required for Missed rays but one is necessary for Exiting and o %A4wEye
Incident rays. %l[Cm4
The candela plots represent flux versus angle and can be smoothed using the :1eI "])(
Candela Options dialog box. The iso-candela plots can be presented as false `23&vGk}
color maps or contour plots. The distribution plots are graphs of cross-sectional =A9>Ej/
curves through the candela distribution. 3lhXD_Y
The orientation of the candela plots is determined by the Normal Vector and the i;*c|ma1>
Up Vector, as specified in the Analysis|Candela Options dialog box. The $&nF1HBI4
normal vector specifies the axis of the candela plot and the up vector specifies Pk [f_%0
“which way is up.”
