给个英文的.个人理解可能会有点出入.基本上是这个意思. gdK/:%u3
t/ 1NTa
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric }^ <zVdwp
units, a luminous intensity plot is in units of candelas (lumens per steradian). In $ d dYH
radiometric units, an intensity plot is in units of watts per steradian. Candela plots =Q}mJs
are commonly used in the design of illumination systems, especially those used in Sg$\ab $
the far field. 0%F.]+6[O4
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface E, fp=.
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ~K96y$ DTE
the model and “go off to infinity.” Exiting rays are the collection of ray segments }Yl=lc vw
following the intersection point of a ray at a surface. Due to ray splitting, several
D.o|($S0
ray segments may contribute to the candela data for each incident ray. Incident Z
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rays are the collection of ray segments which intersect the selected surface. No N]}+F w\5
surface selection is required for Missed rays but one is necessary for Exiting and +I n"OR%
Incident rays. 2S6EDXc
The candela plots represent flux versus angle and can be smoothed using the :\J bWj_j
Candela Options dialog box. The iso-candela plots can be presented as false ~BZV:Es
color maps or contour plots. The distribution plots are graphs of cross-sectional Bqi2n'^O2
curves through the candela distribution. m#$za7
The orientation of the candela plots is determined by the Normal Vector and the "T
u[n\8
Up Vector, as specified in the Analysis|Candela Options dialog box. The ->&VbR)
normal vector specifies the axis of the candela plot and the up vector specifies 1$VI\}
“which way is up.”
