给个英文的.个人理解可能会有点出入.基本上是这个意思. +sd':vE
fL&e^Q
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ciPq @kMV
units, a luminous intensity plot is in units of candelas (lumens per steradian). In lqoVfj'6M
radiometric units, an intensity plot is in units of watts per steradian. Candela plots :|y tw= 3>
are commonly used in the design of illumination systems, especially those used in gF~
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the far field. /'>ck2drjk
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface HN&]`cr;
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” cyI:dv g
the model and “go off to infinity.” Exiting rays are the collection of ray segments DeN$YE#*
following the intersection point of a ray at a surface. Due to ray splitting, several 1!ijRr
ray segments may contribute to the candela data for each incident ray. Incident vb\R~%@T,
rays are the collection of ray segments which intersect the selected surface. No +ldgT"
surface selection is required for Missed rays but one is necessary for Exiting and X u{S4#1
Incident rays. OF( tCK
The candela plots represent flux versus angle and can be smoothed using the <+`}:
A
Candela Options dialog box. The iso-candela plots can be presented as false lIatM@gU
color maps or contour plots. The distribution plots are graphs of cross-sectional \mwxV!!b$
curves through the candela distribution. ~</H>Jd
The orientation of the candela plots is determined by the Normal Vector and the {1vlz>82
Up Vector, as specified in the Analysis|Candela Options dialog box. The pA5X<)~
normal vector specifies the axis of the candela plot and the up vector specifies yjChnp
Cc
“which way is up.”
