给个英文的.个人理解可能会有点出入.基本上是这个意思. oH6(L q'q
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric !3yR?Xem}
units, a luminous intensity plot is in units of candelas (lumens per steradian). In D
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radiometric units, an intensity plot is in units of watts per steradian. Candela plots +/Y )s5@<
are commonly used in the design of illumination systems, especially those used in ?A62VV51CN
the far field. .^JID~<?#
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface T^A:pL1
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 1`aFL5[0$
the model and “go off to infinity.” Exiting rays are the collection of ray segments m l?+JbLg0
following the intersection point of a ray at a surface. Due to ray splitting, several 9Eg'=YJ
ray segments may contribute to the candela data for each incident ray. Incident 8VMq>-
rays are the collection of ray segments which intersect the selected surface. No 1RRvNZW
surface selection is required for Missed rays but one is necessary for Exiting and d9Rj-e1 x
Incident rays. HLk}E*.mC
The candela plots represent flux versus angle and can be smoothed using the m}
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Candela Options dialog box. The iso-candela plots can be presented as false IHxX:a/iv
color maps or contour plots. The distribution plots are graphs of cross-sectional P.;B
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curves through the candela distribution.
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The orientation of the candela plots is determined by the Normal Vector and the p' /$)klt
Up Vector, as specified in the Analysis|Candela Options dialog box. The |":^ 3
normal vector specifies the axis of the candela plot and the up vector specifies -pqShDar|
“which way is up.”
