给个英文的.个人理解可能会有点出入.基本上是这个意思. MPx%#'Q
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric OnE#8*8
units, a luminous intensity plot is in units of candelas (lumens per steradian). In coq7La[
radiometric units, an intensity plot is in units of watts per steradian. Candela plots _oK* 1#Rm8
are commonly used in the design of illumination systems, especially those used in .6Tan2[%
the far field. $8gj}0}eH
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface % "|I`
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or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Tg|0!0qD]F
the model and “go off to infinity.” Exiting rays are the collection of ray segments lB9 9J"A
following the intersection point of a ray at a surface. Due to ray splitting, several K[JbQ30
ray segments may contribute to the candela data for each incident ray. Incident $d 2mcwh\
rays are the collection of ray segments which intersect the selected surface. No Mz,G; x}
surface selection is required for Missed rays but one is necessary for Exiting and WPT0=Hqp7
Incident rays. {2 J o|z
The candela plots represent flux versus angle and can be smoothed using the mO G;[CB
Candela Options dialog box. The iso-candela plots can be presented as false `R@1 Sc<*|
color maps or contour plots. The distribution plots are graphs of cross-sectional &5:83#*Oj
curves through the candela distribution. U^iNOMs?
The orientation of the candela plots is determined by the Normal Vector and the 3o X\q/$
Up Vector, as specified in the Analysis|Candela Options dialog box. The g,Z8I;A^
normal vector specifies the axis of the candela plot and the up vector specifies ha+)ZF
“which way is up.”
