给个英文的.个人理解可能会有点出入.基本上是这个意思. >OL 3H$F
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric x.f]1S7h[
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ZG>PQA
radiometric units, an intensity plot is in units of watts per steradian. Candela plots {1IfU
are commonly used in the design of illumination systems, especially those used in ,24p%KJ*X
the far field. HW=C),*]cR
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Z)! qW?
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Hc>m;[M)l
the model and “go off to infinity.” Exiting rays are the collection of ray segments S& SQ
following the intersection point of a ray at a surface. Due to ray splitting, several I/&%]"[^u
ray segments may contribute to the candela data for each incident ray. Incident [#l*_0
rays are the collection of ray segments which intersect the selected surface. No 6HZ` .o:f
surface selection is required for Missed rays but one is necessary for Exiting and ;*Ivn@L
Incident rays. X#*JWQO=
The candela plots represent flux versus angle and can be smoothed using the o9JMH.G
Candela Options dialog box. The iso-candela plots can be presented as false Of"
color maps or contour plots. The distribution plots are graphs of cross-sectional H7d/X
curves through the candela distribution. 8dO!
The orientation of the candela plots is determined by the Normal Vector and the 8.XoVW#
Up Vector, as specified in the Analysis|Candela Options dialog box. The Jll-`b 1
normal vector specifies the axis of the candela plot and the up vector specifies rf?qdd(~cH
“which way is up.”