给个英文的.个人理解可能会有点出入.基本上是这个意思. .R
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 6VE >$`m
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 3FXMM&w
radiometric units, an intensity plot is in units of watts per steradian. Candela plots xlwsZm{V
are commonly used in the design of illumination systems, especially those used in (D l"s`UH~
the far field. i&HV8&KygN
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface OK)0no=OAK
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” O#EBR<CuK
the model and “go off to infinity.” Exiting rays are the collection of ray segments xw-q )u
following the intersection point of a ray at a surface. Due to ray splitting, several gK<- * v
ray segments may contribute to the candela data for each incident ray. Incident m[bu(q z
rays are the collection of ray segments which intersect the selected surface. No rx;U/)~#<
surface selection is required for Missed rays but one is necessary for Exiting and 9@1W= sl
Incident rays. d+;wDu
The candela plots represent flux versus angle and can be smoothed using the t<k8 .9
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Candela Options dialog box. The iso-candela plots can be presented as false -J30g\
color maps or contour plots. The distribution plots are graphs of cross-sectional &7 W6I M
curves through the candela distribution. >ahj|pm
The orientation of the candela plots is determined by the Normal Vector and the ]Bsq?e^
Up Vector, as specified in the Analysis|Candela Options dialog box. The GMNb;D(>K
normal vector specifies the axis of the candela plot and the up vector specifies kb:C>Y8!sC
“which way is up.”
