给个英文的.个人理解可能会有点出入.基本上是这个意思. #^- U|~,
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric :bLLN
units, a luminous intensity plot is in units of candelas (lumens per steradian). In xj/ +Z!,9
radiometric units, an intensity plot is in units of watts per steradian. Candela plots D]9I-|
are commonly used in the design of illumination systems, especially those used in uvK1gJrA)
the far field. !\a'GO[
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface d#N<t`
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Tn+6:<OFdO
the model and “go off to infinity.” Exiting rays are the collection of ray segments BzqM$F(
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following the intersection point of a ray at a surface. Due to ray splitting, several ]@W.5!5H
ray segments may contribute to the candela data for each incident ray. Incident AepAlnI@
rays are the collection of ray segments which intersect the selected surface. No /-wAy-W
surface selection is required for Missed rays but one is necessary for Exiting and a;Q6S
Incident rays. 2$^n@<uZ@
The candela plots represent flux versus angle and can be smoothed using the A0SEzX({[
Candela Options dialog box. The iso-candela plots can be presented as false M@rknq@
color maps or contour plots. The distribution plots are graphs of cross-sectional \N\Jny
curves through the candela distribution. nf5Ld"|%9
The orientation of the candela plots is determined by the Normal Vector and the n>tYeN)F<
Up Vector, as specified in the Analysis|Candela Options dialog box. The :7t~p&J
normal vector specifies the axis of the candela plot and the up vector specifies R 2uo ZA,
“which way is up.”