给个英文的.个人理解可能会有点出入.基本上是这个意思. .r-kH&)"GU
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric x
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units, a luminous intensity plot is in units of candelas (lumens per steradian). In J5\2`U_FZ
radiometric units, an intensity plot is in units of watts per steradian. Candela plots vu/P"?F
are commonly used in the design of illumination systems, especially those used in "o<&3c4
the far field. ?qtL*;
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface bj 0-72V
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” p2 m`p T
the model and “go off to infinity.” Exiting rays are the collection of ray segments <*$IZl6I
following the intersection point of a ray at a surface. Due to ray splitting, several 4eS( dPI0
ray segments may contribute to the candela data for each incident ray. Incident 2 >inyn)S
rays are the collection of ray segments which intersect the selected surface. No $yMNdBI[
surface selection is required for Missed rays but one is necessary for Exiting and $60]RCu
Incident rays. d^XRkB:h
The candela plots represent flux versus angle and can be smoothed using the |JC n=v@
Candela Options dialog box. The iso-candela plots can be presented as false U9q6m3#$
color maps or contour plots. The distribution plots are graphs of cross-sectional p%CcD]o
curves through the candela distribution. R6G%_,p$7
The orientation of the candela plots is determined by the Normal Vector and the y1Yrf,E
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Up Vector, as specified in the Analysis|Candela Options dialog box. The . A <n2-
normal vector specifies the axis of the candela plot and the up vector specifies b#_ u.vP
“which way is up.”
