给个英文的.个人理解可能会有点出入.基本上是这个意思. XzSl"U PYH
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric yg H )U.
units, a luminous intensity plot is in units of candelas (lumens per steradian). In \ #LDX,=
radiometric units, an intensity plot is in units of watts per steradian. Candela plots *~shvtq
are commonly used in the design of illumination systems, especially those used in ( H&HSs
the far field. TfT^.p*
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface /RM tCa~
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” TukhGgmF
the model and “go off to infinity.” Exiting rays are the collection of ray segments M2p|&Z%
following the intersection point of a ray at a surface. Due to ray splitting, several [ 5!}+8]W
ray segments may contribute to the candela data for each incident ray. Incident ygj%VG
rays are the collection of ray segments which intersect the selected surface. No +_$s9`@]6
surface selection is required for Missed rays but one is necessary for Exiting and 1 :$#a
Incident rays. \8!CKnfs
The candela plots represent flux versus angle and can be smoothed using the cu
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Candela Options dialog box. The iso-candela plots can be presented as false nOd;Zw
color maps or contour plots. The distribution plots are graphs of cross-sectional JbL3/h]
curves through the candela distribution. v%AepK&
The orientation of the candela plots is determined by the Normal Vector and the F-rhxJd
Up Vector, as specified in the Analysis|Candela Options dialog box. The `h' l"3l
normal vector specifies the axis of the candela plot and the up vector specifies !-^oU"
“which way is up.”
