给个英文的.个人理解可能会有点出入.基本上是这个意思. ~NNv>5 t5
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric kCA5|u
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ) ooWQ-%P
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 9=$ !gC)
are commonly used in the design of illumination systems, especially those used in ;+`uER
the far field. gX,9Gh
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface U9#WN.noG
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Y= Hz;Ni
the model and “go off to infinity.” Exiting rays are the collection of ray segments XDYosC:
following the intersection point of a ray at a surface. Due to ray splitting, several >Z\BfH
ray segments may contribute to the candela data for each incident ray. Incident DB@EVH
rays are the collection of ray segments which intersect the selected surface. No r7I
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surface selection is required for Missed rays but one is necessary for Exiting and %-j&e4 4
Incident rays. nbxR"UH
The candela plots represent flux versus angle and can be smoothed using the n93zD*;5
Candela Options dialog box. The iso-candela plots can be presented as false XP;x@I#l
color maps or contour plots. The distribution plots are graphs of cross-sectional ]US[5)EL-
curves through the candela distribution. 1V%'.l9
The orientation of the candela plots is determined by the Normal Vector and the A1A3~9HuK
Up Vector, as specified in the Analysis|Candela Options dialog box. The o~C('1Fd b
normal vector specifies the axis of the candela plot and the up vector specifies 70Ka!
“which way is up.”
