给个英文的.个人理解可能会有点出入.基本上是这个意思. vfzGRr
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric H4 Y7p
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ] , Wh]q
radiometric units, an intensity plot is in units of watts per steradian. Candela plots =Xzqp ,
are commonly used in the design of illumination systems, especially those used in [^ck;4q
the far field. W+PAlsOC
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface B#o(21s
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 5P{dey!
the model and “go off to infinity.” Exiting rays are the collection of ray segments xjOy3_Js
following the intersection point of a ray at a surface. Due to ray splitting, several yA tM|:qq
ray segments may contribute to the candela data for each incident ray. Incident @eMDRbgq;[
rays are the collection of ray segments which intersect the selected surface. No ]3hz{zqV^
surface selection is required for Missed rays but one is necessary for Exiting and [ YP8 z~
Incident rays. ,R0@`t1 p
The candela plots represent flux versus angle and can be smoothed using the W ]5k M~Q@
Candela Options dialog box. The iso-candela plots can be presented as false 8
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color maps or contour plots. The distribution plots are graphs of cross-sectional gVCkj!{
curves through the candela distribution. _dppUUm
The orientation of the candela plots is determined by the Normal Vector and the n"Ec %n
Up Vector, as specified in the Analysis|Candela Options dialog box. The Y{Kpopst
normal vector specifies the axis of the candela plot and the up vector specifies jo=Xx A
“which way is up.”
