给个英文的.个人理解可能会有点出入.基本上是这个意思. #Y[H8TW
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric LCQkgRs}~{
units, a luminous intensity plot is in units of candelas (lumens per steradian). In yBz >0I3
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 7tH]*T9e>
are commonly used in the design of illumination systems, especially those used in Goj4`Hc
the far field. i=QqB0
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface
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or rays Incident on a surface. Missed rays are a collection of all rays that “leave” kqB\xlS7k
the model and “go off to infinity.” Exiting rays are the collection of ray segments 7;HUE!5,^l
following the intersection point of a ray at a surface. Due to ray splitting, several D6!t VdnVe
ray segments may contribute to the candela data for each incident ray. Incident DY> <qk
rays are the collection of ray segments which intersect the selected surface. No T 2bnzI i
surface selection is required for Missed rays but one is necessary for Exiting and 5_G'68;OV
Incident rays. a@|.;#FF
The candela plots represent flux versus angle and can be smoothed using the bNvAyKc-
Candela Options dialog box. The iso-candela plots can be presented as false ]+IVSxa!u
color maps or contour plots. The distribution plots are graphs of cross-sectional Kp_ jy.e7&
curves through the candela distribution. oofFrAaT
The orientation of the candela plots is determined by the Normal Vector and the
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Up Vector, as specified in the Analysis|Candela Options dialog box. The IYNM U\s
normal vector specifies the axis of the candela plot and the up vector specifies 0|2%# E
“which way is up.”
