给个英文的.个人理解可能会有点出入.基本上是这个意思. Q[+o\{ O
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric R0n# FL^E
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ?y\gjC6CNG
radiometric units, an intensity plot is in units of watts per steradian. Candela plots j(`L)/ |O
are commonly used in the design of illumination systems, especially those used in @} 61D
the far field. [a&|c%h
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 4EO,9#0
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 86s.qPB0
the model and “go off to infinity.” Exiting rays are the collection of ray segments o0nKgq'w|x
following the intersection point of a ray at a surface. Due to ray splitting, several g?'4G$M
ray segments may contribute to the candela data for each incident ray. Incident i 9NUv3#
rays are the collection of ray segments which intersect the selected surface. No k|^e=I
surface selection is required for Missed rays but one is necessary for Exiting and MMMuT^X
Incident rays. M mjeFv
The candela plots represent flux versus angle and can be smoothed using the e Akj pc
Candela Options dialog box. The iso-candela plots can be presented as false `|1#Vuk
color maps or contour plots. The distribution plots are graphs of cross-sectional D=w5Lks
curves through the candela distribution. Q.q'p J-
The orientation of the candela plots is determined by the Normal Vector and the Hq{i-z+
Up Vector, as specified in the Analysis|Candela Options dialog box. The ? (&)p~o
normal vector specifies the axis of the candela plot and the up vector specifies }4! R2c
“which way is up.”
