给个英文的.个人理解可能会有点出入.基本上是这个意思. yM}}mypS
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 2?u>A3^R
units, a luminous intensity plot is in units of candelas (lumens per steradian). In AON";&dLq-
radiometric units, an intensity plot is in units of watts per steradian. Candela plots J*o :RnB
are commonly used in the design of illumination systems, especially those used in cv=nGFx6
the far field. %0fF _OU
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 1P.
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or rays Incident on a surface. Missed rays are a collection of all rays that “leave” MUhC6s\F
the model and “go off to infinity.” Exiting rays are the collection of ray segments d rnqX-E;
following the intersection point of a ray at a surface. Due to ray splitting, several X^r5su?
ray segments may contribute to the candela data for each incident ray. Incident }fpK{db
rays are the collection of ray segments which intersect the selected surface. No w < 3}(1
surface selection is required for Missed rays but one is necessary for Exiting and zl F*F8> m
Incident rays. <W~5;m
The candela plots represent flux versus angle and can be smoothed using the 1P#bR` I
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Candela Options dialog box. The iso-candela plots can be presented as false 8c(}*,O/
color maps or contour plots. The distribution plots are graphs of cross-sectional R7;SZo
curves through the candela distribution. nd3=\. (P
The orientation of the candela plots is determined by the Normal Vector and the {hG r`Rh
Up Vector, as specified in the Analysis|Candela Options dialog box. The C)~YWx@v
normal vector specifies the axis of the candela plot and the up vector specifies PVP,2Yq!
“which way is up.”
