给个英文的.个人理解可能会有点出入.基本上是这个意思. &gKP6ANx2
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric '|dKg"Yl
units, a luminous intensity plot is in units of candelas (lumens per steradian). In rRA_'t;uK
radiometric units, an intensity plot is in units of watts per steradian. Candela plots !0d9<SVC
are commonly used in the design of illumination systems, especially those used in skmDsZ zw
the far field. 1*x5/b
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 2Wc;hJ.1
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” `*uuB ;
the model and “go off to infinity.” Exiting rays are the collection of ray segments ~gzpX,{ n
following the intersection point of a ray at a surface. Due to ray splitting, several nKZRq&~^E
ray segments may contribute to the candela data for each incident ray. Incident D @YM}HXuj
rays are the collection of ray segments which intersect the selected surface. No ^<5^9]x
surface selection is required for Missed rays but one is necessary for Exiting and f|[5&,2<
Incident rays. eog,EP"a8Y
The candela plots represent flux versus angle and can be smoothed using the 5. +$v 4
Candela Options dialog box. The iso-candela plots can be presented as false a3E*%G
color maps or contour plots. The distribution plots are graphs of cross-sectional *YE IG#`
curves through the candela distribution. -mWw.SfEZ
The orientation of the candela plots is determined by the Normal Vector and the K {[Fa,]'
Up Vector, as specified in the Analysis|Candela Options dialog box. The 0ghwFo
normal vector specifies the axis of the candela plot and the up vector specifies ! 513rNO
“which way is up.”
