给个英文的.个人理解可能会有点出入.基本上是这个意思. x/s:/YN'
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric jW: 7PS
units, a luminous intensity plot is in units of candelas (lumens per steradian). In J||g(+H>
radiometric units, an intensity plot is in units of watts per steradian. Candela plots Dmh$@Uu#F
are commonly used in the design of illumination systems, especially those used in if'=W6W
the far field. S F)$b
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface { I{ 0rV
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” >fC&bab
the model and “go off to infinity.” Exiting rays are the collection of ray segments M1Q&)am
following the intersection point of a ray at a surface. Due to ray splitting, several !BoGSI
ray segments may contribute to the candela data for each incident ray. Incident !4p{ b f
rays are the collection of ray segments which intersect the selected surface. No ;?Pz 0,{h
surface selection is required for Missed rays but one is necessary for Exiting and M XG>|
Incident rays. $>/d)o
The candela plots represent flux versus angle and can be smoothed using the Gld~GyB\k
Candela Options dialog box. The iso-candela plots can be presented as false Q ,NnB{R
color maps or contour plots. The distribution plots are graphs of cross-sectional \n_7+[=E
curves through the candela distribution. p\[!=ZXFr\
The orientation of the candela plots is determined by the Normal Vector and the ]t 0o%w
Up Vector, as specified in the Analysis|Candela Options dialog box. The )?jFz'<r
normal vector specifies the axis of the candela plot and the up vector specifies LDg9@esi
“which way is up.”
