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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Y76gJ[y jn
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 5=ryDrx
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ZJiG!+-j
are commonly used in the design of illumination systems, especially those used in PEZ!n.'S
the far field. w \O;!1iU
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Cw&KVw*
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Cp0=k
the model and “go off to infinity.” Exiting rays are the collection of ray segments N;`n@9BF
following the intersection point of a ray at a surface. Due to ray splitting, several TM%%O : 3
ray segments may contribute to the candela data for each incident ray. Incident w``U=sfmV
rays are the collection of ray segments which intersect the selected surface. No oEpFuWp%A
surface selection is required for Missed rays but one is necessary for Exiting and A.w.rVDD
Incident rays.
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The candela plots represent flux versus angle and can be smoothed using the 7@W>E;go
Candela Options dialog box. The iso-candela plots can be presented as false ;aVZ"~a+\
color maps or contour plots. The distribution plots are graphs of cross-sectional l.M0` Cn-%
curves through the candela distribution. JB<t6+"rD
The orientation of the candela plots is determined by the Normal Vector and the dSHDWu&
Up Vector, as specified in the Analysis|Candela Options dialog box. The 5Gm_\kd
normal vector specifies the axis of the candela plot and the up vector specifies 1?l1:}^ L
“which way is up.”
