给个英文的.个人理解可能会有点出入.基本上是这个意思. 6ji z$x
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric IZV D.1
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 8Ilg[Drj*
radiometric units, an intensity plot is in units of watts per steradian. Candela plots }-:s9Lt
are commonly used in the design of illumination systems, especially those used in ZCZY gf@
the far field. `4&
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface IG1+_-H:
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” %z&=A%'a
the model and “go off to infinity.” Exiting rays are the collection of ray segments 4
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following the intersection point of a ray at a surface. Due to ray splitting, several u~,@ Zg87
ray segments may contribute to the candela data for each incident ray. Incident ~7tG%{t%
rays are the collection of ray segments which intersect the selected surface. No VQ/<MY C
surface selection is required for Missed rays but one is necessary for Exiting and YH(
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Incident rays. 0^Vc,\P?
The candela plots represent flux versus angle and can be smoothed using the Azun"F_f
Candela Options dialog box. The iso-candela plots can be presented as false w 6M EY"<L
color maps or contour plots. The distribution plots are graphs of cross-sectional D_%y&p?<Ls
curves through the candela distribution. R!i9N'gGG(
The orientation of the candela plots is determined by the Normal Vector and the ?\ C7.of
Up Vector, as specified in the Analysis|Candela Options dialog box. The ^h
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normal vector specifies the axis of the candela plot and the up vector specifies MX-(;H
“which way is up.”
