给个英文的.个人理解可能会有点出入.基本上是这个意思. -kFPmM;
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric F=/@D)hND
units, a luminous intensity plot is in units of candelas (lumens per steradian). In /wF*@ /PTH
radiometric units, an intensity plot is in units of watts per steradian. Candela plots KJ/
* BBf
are commonly used in the design of illumination systems, especially those used in !G `7T
the far field. #q[k"x =c
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface cjTV~(i'4A
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 6Dx^$=Sa$
the model and “go off to infinity.” Exiting rays are the collection of ray segments o;d> <
following the intersection point of a ray at a surface. Due to ray splitting, several q6xm#Fd'.
ray segments may contribute to the candela data for each incident ray. Incident b+Ly%&
rays are the collection of ray segments which intersect the selected surface. No Het5{Yb.
surface selection is required for Missed rays but one is necessary for Exiting and :E$ <!q
Incident rays. 4 [\[Ho
The candela plots represent flux versus angle and can be smoothed using the ynWF Y<VX
Candela Options dialog box. The iso-candela plots can be presented as false y.pwj~s
color maps or contour plots. The distribution plots are graphs of cross-sectional Klw \
curves through the candela distribution. ]VarO'
The orientation of the candela plots is determined by the Normal Vector and the w=ZSyT-i
Up Vector, as specified in the Analysis|Candela Options dialog box. The L=Pz0
normal vector specifies the axis of the candela plot and the up vector specifies epWTZV(1x
“which way is up.”
