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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 'IVNqfC)u
units, a luminous intensity plot is in units of candelas (lumens per steradian). In #J4{W84B
radiometric units, an intensity plot is in units of watts per steradian. Candela plots R<* c
are commonly used in the design of illumination systems, especially those used in ] yg3|C;
the far field. SQ$|s%)oB
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface _>:R]2Ew
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” g7X jo )
the model and “go off to infinity.” Exiting rays are the collection of ray segments x}\_o< d
following the intersection point of a ray at a surface. Due to ray splitting, several W8bh49
ray segments may contribute to the candela data for each incident ray. Incident .
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rays are the collection of ray segments which intersect the selected surface. No 1a _R 8 j
surface selection is required for Missed rays but one is necessary for Exiting and R ;XG2
Incident rays. 0# $<2
The candela plots represent flux versus angle and can be smoothed using the hh%f mc
Candela Options dialog box. The iso-candela plots can be presented as false :9nqQJ+~
color maps or contour plots. The distribution plots are graphs of cross-sectional c)L1@ qdZ
curves through the candela distribution. nw.,` M,N
The orientation of the candela plots is determined by the Normal Vector and the yf
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Up Vector, as specified in the Analysis|Candela Options dialog box. The 45?aV@
normal vector specifies the axis of the candela plot and the up vector specifies hU:
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“which way is up.”
