给个英文的.个人理解可能会有点出入.基本上是这个意思. KQ9:lJKr
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric TPEZ"%=Hg
units, a luminous intensity plot is in units of candelas (lumens per steradian). In !Xj m h$F
radiometric units, an intensity plot is in units of watts per steradian. Candela plots #t(?8! F
are commonly used in the design of illumination systems, especially those used in L bYI{|_Js
the far field. BkqIfV%O
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 7\/O"Ot
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” dadMwe_l0
the model and “go off to infinity.” Exiting rays are the collection of ray segments $oua]8!
following the intersection point of a ray at a surface. Due to ray splitting, several !s)$_tG
ray segments may contribute to the candela data for each incident ray. Incident (I~,&aBr
rays are the collection of ray segments which intersect the selected surface. No )sS< %Xf
surface selection is required for Missed rays but one is necessary for Exiting and {G{@bUG]p
Incident rays. $qrr]U
The candela plots represent flux versus angle and can be smoothed using the Io"=X! k
Candela Options dialog box. The iso-candela plots can be presented as false wA~Nfn
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color maps or contour plots. The distribution plots are graphs of cross-sectional 'FUPv61()
curves through the candela distribution. <WbD4Q<3?
The orientation of the candela plots is determined by the Normal Vector and the <0LB]zDWe6
Up Vector, as specified in the Analysis|Candela Options dialog box. The 8m*\"_S{
normal vector specifies the axis of the candela plot and the up vector specifies Z.mV fy%
“which way is up.”
